OpenRocket wiki - User contributions [en]

Component Details

2015-03-23T02:42:19Z

Anton: /* Appendix A: Components Details */

<div style="text-align: center;">
<div style="float: left;">[[Other Stuff|← Other Stuff]]</div>
<div style="float: right;">[[User's Guide|Contents →]]</div>
[[User's Guide|↑ Back to Contents]]
</div>

{{UserGuideHelp}}

==Appendix A: Components Details==
''List/table/whatever of all the available component types, parameters and any limitations of each.''

[[File:OpenRocket_Components.png|thumb|800 px|center| Openrocket components.]]

Body components and fins set
{| border="2" style="margin-left: 2em"
| '''Nose Cone[[File:noise_cone.png|thumb|800 px|center]]'''
| <tt> It is possible to choose from different Nose cone types. </tt>
|-
| '''Body tube[[File:body_tube.png|thumb|800 px|center]]'''
| <tt> The carcass and the rocket itself. Possible to chose different materials and thicknesses that affect densities and therefore weights of rocket. </tt>
|-
| '''Transition[[File:transition.png|thumb|800 px|center]]'''
| <tt> </tt>
|-
| '''Launch lug[[File:launch_lug.png|thumb|800 px|center]]'''
| <tt> </tt>
|-
| '''Fins Trapezoidal[[File:fin_trapezoidale.png|thumb|800 px|center]]Eliptical[[File:fin_eliptical.png|thumb|800 px|center]]Free form[[File:fin_freeform.png|thumb|800 px|center]]'''
| <tt> </tt>
|}

Inner components
{| border="2" style="margin-left: 2em"
| '''Inner tube[[File:inner_tube.png|thumb|800 px|center]]'''
| <tt>Inner tubes are usually used as motor mount.</tt>
|-
| '''Coupler[[File:coupler.png|thumb|800 px|center]]'''
| <tt>Tubes can be connected together using couplers. Couplers can also be used to make pistons. </tt>
|-
| '''Centering ring[[File:centering_ring.png|thumb|800 px|center]]'''
| <tt> </tt>
|-
| '''Bulkhead[[File:bulkead.png|thumb|800 px|center]]'''
| <tt> </tt>
|-
| '''Engine block[[File:engine_block.png|thumb|800 px|center]]'''
| <tt> </tt>
|}

Mass objects
{| border="2" style="margin-left: 2em"
| '''Parachute[[File:parachute.png|thumb|800 px|center]]'''
| <tt> </tt>
|-
| '''Shock corde[[File:shock_cord.png|thumb|800 px|center]]'''
| <tt></tt>
|-
| '''Streamer[[File:streamer.png|thumb|800 px|center]]'''
| <tt></tt>
|-
| '''Mass component[[File:Mass_Component.png|thumb|800 px|center]]'''
| <tt></tt>
|}
----
<div style="text-align: center;">
<div style="float: left;">[[Other Stuff|← Other Stuff]]</div>
<div style="float: right;">[[User's Guide|Contents →]]</div>
[[User's Guide|↑ Back to Contents]]
</div>

User talk:Elrond Peredhil

2015-03-14T19:05:42Z

Anton: Blanked the page

User talk:Sampo Niskanen

2015-03-13T21:07:02Z

Anton: Created page with "Hello, I recently discovered that OpenRocket Wiki is being misused. user Alexcross uses OpenRocket Wiki for purposes not related to OpenRocket by any means: he has created m..."

Hello,

I recently discovered that OpenRocket Wiki is being misused.

user Alexcross uses OpenRocket Wiki for purposes not related to OpenRocket by any means: he has created many pages with links for downloads of some files unrelated to OpenRocket.
His [http://wiki.openrocket.info/index.php?title=Special:Contributions/Alexcross&dir=prev&limit=100&target=Alexcross contribution log] is so long that it is even difficult to estimate the number of pages he has created. (In fact, the Special:Statistics statistics report states there are over 32,000 pages and only 39 of them are content pages.

Therefore I believe the Alexcross's contributions should be reverted and his account should be removed.

Main Page

2015-03-13T17:54:57Z

Anton: Preparation for translation

<translate>

This is the wiki for OpenRocket, an open-source model rocket simulator. The OpenRocket documentation is written collaboratively here.

The main web site for OpenRocket is '''http://openrocket.sourceforge.net/'''

{| style="width:45%; float: right; margin-left: 1em; padding: 0.5em; background: #eef; border: 1px solid #aad;"
|
=== New OpenRocket Wiki ===
The OpenRocket wiki has recently moved to this new site. The [http://sourceforge.net/apps/mediawiki/openrocket/index.php?title=Main_Page old site] is obsoleted, and all the English content has been moved to this site. You are free to edit and improve this site.

This site is multilingual and uses the MediaWiki Translate extension for localization. The translations from the old site have not yet been moved to this one, though. If you'd like to help, please read the [[Instructions for translators]].
|}

=== OpenRocket Documentation ===

* [[User's Guide]]

* [[Feature comparison]]

* [[FAQ|Frequently asked questions]]

* [[Tips]]

* [[List of useful custom expressions]]

* [[Scripting with Python and JPype]]

* [http://openrocket.sourceforge.net/documentation.html Technical Documentation]

* [[Resources]]

=== Developer resources ===

* [[Developer's Guide]]

* [[Creating guided tours]]

* New feature discussion pages:
: [[Feature wishlist]]
: [[Component databases]]
: [[Plugin system]]
: [[User interface]]
: [[Remote library interface]]

* '''[[Instructions for translators]]'''

</translate>

User's Guide

2015-03-12T22:50:14Z

Anton: /* FAQ and HOWTO */

{{Access}}

== FAQ and HOWTO ==
Basically responses to FAQs or brief HOWTOs for specific tasks.

* [[FAQ]] - contains information on many common tasks with OpenRocket

== User's Guide (Work In Progress) ==

{{UserGuideHelp}}

=== '''Contents''' ===

1. [[Introduction]]

2. [[Downloading & Installing]]

3. [[Getting Started]]

4. [[Basic Rocket Design]]

5. [[Basic Flight Simulation]]

6. [[Advanced Rocket Design]]

7. [[Advanced Flight Simulation]]

8. [[Rocket Analysis]]

9. [[Custom Expressions]]

10. [[Simulation Listeners]]

11. [[Other Stuff]]

Appendices:

A. [[Component Details]]

User's Guide

2015-03-12T21:22:42Z

Anton: /* FAQ and HOWTO */ Merged [Application installation (especially for people not real familiar with Java).] to [Downloading & Installing] since it explains Installation in greater detail.

{{Access}}

== FAQ and HOWTO ==
Basically responses to FAQs or brief HOWTOs for specific tasks.

* [[Frequently asked questions]] - contains information on many common tasks with OpenRocket

== User's Guide (Work In Progress) ==

{{UserGuideHelp}}

=== '''Contents''' ===

1. [[Introduction]]

2. [[Downloading & Installing]]

3. [[Getting Started]]

4. [[Basic Rocket Design]]

5. [[Basic Flight Simulation]]

6. [[Advanced Rocket Design]]

7. [[Advanced Flight Simulation]]

8. [[Rocket Analysis]]

9. [[Custom Expressions]]

10. [[Simulation Listeners]]

11. [[Other Stuff]]

Appendices:

A. [[Component Details]]

Downloading & Installing

2015-03-12T21:18:44Z

Anton: /* General */

<div style="text-align: center;">
<div style="float: left;">[[Introduction|← Introduction]]</div>
<div style="float: right;">[[Getting Started|Getting Started →]]</div>
[[User's Guide|↑ Back to Contents]]
</div>

{{UserGuideHelp}}

__TOC__

OpenRocket is a Java application, which means that you need to have [http://www.java.com/en/download/index.jsp Java] installed on your computer before you can use it. OpenRocket requires '''Java Version 6''' or better to run, you can check which version of Java is installed on your computer by clicking [http://www.java.com/en/download/installed.jsp?detect=jre&try=1 here]. If Java is not installed, that page should provide you with a link to download and install the latest version for your operating system. Some operating systems come with Java pre-installed, while others don't. The installation processes for Windows, Mac OS X and Linux are shown below.

== General ==

In general, OpenRocket is installed by following these three steps:

# Make sure you have the correct version of Java, and [http://www.java.com/getjava/ install or upgrade] if not.
# [http://openrocket.sourceforge.net/download.html Download] the OpenRocket application.
# Open the application and use it. On most operating systems you can just double-click the icon for the OpenRocket file which was downloaded, no further installation is required.

== Windows Users ==
Windows does '''not''' come with any sort of Java pre-installed. However, it's quite likely that Java has already been installed as part of another application, you can check by using [http://www.java.com/en/download/installed.jsp?detect=jre&try=1 this page]. If you don't have Java installed, you will need to [http://www.java.com/en/download/index.jsp download] and install it before continuing.

Once you have Java, installing OpenRocket on any version of Windows is simple:
# [http://openrocket.sourceforge.net/download.html Download] OpenRocket to the folder of your choice.
# Double click the file to start the program.

That's it! If you didn't save the OpenRocket file to your Desktop, you can place a shortcut there by right-clicking on the OpenRocket file, mousing over "Send to" and clicking "Desktop (create shortcut)".

== Mac OS X Users ==
If your computer runs OS X 10.7.2 or older version, then it receives Java updates from Apple. Apple sends out Java with system updates, so it should already be installed. A common complication with Mac users is that most Macs have both Java 5 and Java 6 installed, and Java 5 is used by default. If you try to use OpenRocket and get an error, then you probably still have Java 5 set as the default.

To set Java 6 as the default:
# Open the Utilities folder (Finder -> Go -> Utilities). [[File:FinderOpenUtilities.png|none|300px]]
# Open the Java Preferences Application (double-click Java Preferences.app). [[File:UtilitiesJavaPreferences.png|none|300px]]
# In the bottom section of the window that opens, drag Java 6 to top of list. [[File:JavaApplicationPreferences.png|none|300px]]

If your Mac runs OS X 10.7.3 (Lion) or later version, then the updates are delivered directly by Oracle and you should not encounter any problems.

For more information on software versions and updates, visit [https://www.java.com/en/download/faq/java_mac.xml Java on Mac OS X] page of the Oracle official web site.

== Linux Users ==

=== Ubuntu/Debian Repository ===

If you are running a recent version of Ubuntu or Debian, then OpenRocket can be easily installed using the Ubuntu Software Center or Synaptic (etc.). Please note that the version in the distribution repository ''may not be the latest version''. Alternatively you may install OpenRocket from the command line:
<pre>sudo apt-get install openrocket</pre>

To start OpenRocket, simply select it from the Applications menu.

=== Official Version ===

# [http://openrocket.sourceforge.net/download.html Download] the OpenRocket application.
# Copy it to a convenient folder.
# Make the .jar file executable (right-click on .jar file, select "Properties", go to the Permissions tab and check the "Allow executing file as program" box).
# Start OpenRocket by either double-clicking the .jar file, or right-clicking the .jar file, and selecting "Open with Sun Java6 Runtime".
If the default is set to open with the Archive Manager, then right-click, select "Open with other application", then select "Open with Sun Java6 Runtime", and check the box to make that the default. In future, it should be possible to just double-click to start OpenRocket.

Alternatively you may start OpenRocket from the command line:
<pre>java -jar OpenRocket-14.06.jar</pre>

Or, if you are not currently in the same directory as the .jar file, replace '/path/to/' by the appropriate path on your system:
<pre>java -jar /path/to/OpenRocket-14.06.jar</pre>

----
<div style="text-align: center;">
<div style="float: left;">[[Introduction|← Introduction]]</div>
<div style="float: right;">[[Getting Started|Getting Started →]]</div>
[[User's Guide|↑ Back to Contents]]
</div>

Application installation (especially for people not real familiar with Java).

2015-03-12T21:14:00Z

Anton: Merged content to Downloading & Installing because it explains the same process in greater detail.

#REDIRECT [[Downloading & Installing]]

Downloading & Installing

2015-03-12T20:57:07Z

Anton: /* Mac OS X Users */ Merged content from Application installation (especially for people not real familiar with Java). to here.

<div style="text-align: center;">
<div style="float: left;">[[Introduction|← Introduction]]</div>
<div style="float: right;">[[Getting Started|Getting Started →]]</div>
[[User's Guide|↑ Back to Contents]]
</div>

{{UserGuideHelp}}

__TOC__

OpenRocket is a Java application, which means that you need to have [http://www.java.com/en/download/index.jsp Java] installed on your computer before you can use it. OpenRocket requires '''Java Version 6''' or better to run, you can check which version of Java is installed on your computer by clicking [http://www.java.com/en/download/installed.jsp?detect=jre&try=1 here]. If Java is not installed, that page should provide you with a link to download and install the latest version for your operating system. Some operating systems come with Java pre-installed, while others don't. The installation processes for Windows, Mac OS X and Linux are shown below.

== General ==

In general, OpenRocket is installed by following these three steps:

# Make sure you have the correct version of Java, and install or upgrade if not.
# [http://openrocket.sourceforge.net/download.html Download] the OpenRocket application.
# Open the application and use it. On most operating systems you can just double-click the icon for the OpenRocket file which was downloaded, no further installation is required.

== Windows Users ==
Windows does '''not''' come with any sort of Java pre-installed. However, it's quite likely that Java has already been installed as part of another application, you can check by using [http://www.java.com/en/download/installed.jsp?detect=jre&try=1 this page]. If you don't have Java installed, you will need to [http://www.java.com/en/download/index.jsp download] and install it before continuing.

Once you have Java, installing OpenRocket on any version of Windows is simple:
# [http://openrocket.sourceforge.net/download.html Download] OpenRocket to the folder of your choice.
# Double click the file to start the program.

That's it! If you didn't save the OpenRocket file to your Desktop, you can place a shortcut there by right-clicking on the OpenRocket file, mousing over "Send to" and clicking "Desktop (create shortcut)".

== Mac OS X Users ==
If your computer runs OS X 10.7.2 or older version, then it receives Java updates from Apple. Apple sends out Java with system updates, so it should already be installed. A common complication with Mac users is that most Macs have both Java 5 and Java 6 installed, and Java 5 is used by default. If you try to use OpenRocket and get an error, then you probably still have Java 5 set as the default.

To set Java 6 as the default:
# Open the Utilities folder (Finder -> Go -> Utilities). [[File:FinderOpenUtilities.png|none|300px]]
# Open the Java Preferences Application (double-click Java Preferences.app). [[File:UtilitiesJavaPreferences.png|none|300px]]
# In the bottom section of the window that opens, drag Java 6 to top of list. [[File:JavaApplicationPreferences.png|none|300px]]

If your Mac runs OS X 10.7.3 (Lion) or later version, then the updates are delivered directly by Oracle and you should not encounter any problems.

For more information on software versions and updates, visit [https://www.java.com/en/download/faq/java_mac.xml Java on Mac OS X] page of the Oracle official web site.

== Linux Users ==

=== Ubuntu/Debian Repository ===

If you are running a recent version of Ubuntu or Debian, then OpenRocket can be easily installed using the Ubuntu Software Center or Synaptic (etc.). Please note that the version in the distribution repository ''may not be the latest version''. Alternatively you may install OpenRocket from the command line:
<pre>sudo apt-get install openrocket</pre>

To start OpenRocket, simply select it from the Applications menu.

=== Official Version ===

# [http://openrocket.sourceforge.net/download.html Download] the OpenRocket application.
# Copy it to a convenient folder.
# Make the .jar file executable (right-click on .jar file, select "Properties", go to the Permissions tab and check the "Allow executing file as program" box).
# Start OpenRocket by either double-clicking the .jar file, or right-clicking the .jar file, and selecting "Open with Sun Java6 Runtime".
If the default is set to open with the Archive Manager, then right-click, select "Open with other application", then select "Open with Sun Java6 Runtime", and check the box to make that the default. In future, it should be possible to just double-click to start OpenRocket.

Alternatively you may start OpenRocket from the command line:
<pre>java -jar OpenRocket-14.06.jar</pre>

Or, if you are not currently in the same directory as the .jar file, replace '/path/to/' by the appropriate path on your system:
<pre>java -jar /path/to/OpenRocket-14.06.jar</pre>

----
<div style="text-align: center;">
<div style="float: left;">[[Introduction|← Introduction]]</div>
<div style="float: right;">[[Getting Started|Getting Started →]]</div>
[[User's Guide|↑ Back to Contents]]
</div>

Advanced Rocket Design

2015-03-07T15:52:04Z

Anton: /* National Association of Rocketry */

<div style="text-align: center;">
<div style="float: left;">[[Basic Rocket Design|← Basic Rocket Design]]</div>
<div style="float: right;">[[Advanced Flight Simulation|Advanced Flight Simulation →]]</div>
[[User's Guide|↑ Back to Contents]]
</div>

{{UserGuideHelp}}

 
In this section, advanced design principles and concepts are discussed, with step-by-step instructions describing how to incorporate these techniques into designs created in OpenRocket. Implementing the techniques described in this section may require specialized materials and electronic devices intended for use only by experienced rocketeers. 

Advanced rocket design encompasses configurations for high power rockets generally, including:
           •          recovery systems,
           •          through-the-wall fin construction,
           •          electronic and dual deployment,
           •          complex multi-staging (such as motor racking) and motor clustering, and
           •          roll stabilization.And, utilizing mass and center of gravity (CG) overrides will improve OpenRocket flight and recovery simulation accuracy.
 

= Increasing Simulation Accuracy by Overriding Mass and Center of Gravity =

<<INSERTION POINT>>

== Adhesive, Paint, and Other Weight Factors ==

<<INSERTION POINT>>

= Recovery Systems =

== Recovery Techniques ==

Recovery systems are intended to return a rocket safely to the ground, without harm to people or damage to the rocket or other objects. Though recovery mechanisms vary greatly, recovery systems generally include elements of one or more of these techniques:
           •          featherweight
           •          break-apart
           •          streamer
           •          parachute
           •          helicopter
           •          gliding

=== Featherweight and Break-Apart Recovery ===

Featherweight and break-apart recovery work by creating enough drag to ensure that the terminal velocity of the rocket is so low that it won't be damaged or do damage when it hits the ground. Featherweight designs are often minimum diameter rockets that eject the burned-out motor casing altogether, or use the ejection charge to shift the casing position rearward after motor burnout (within an extended motor hook), to induce instability and cause the rocket to tumble. Break-apart recovery, aerodynamically, does the same thing, increasing drag and inducing instability by breaking the rocket into two or more sections connected together by a shock cord. Typically, a feather weight rocket, and each section of a break-apart rocket weighs less than one ounce. 

==== Example Featherweight Design ====

<<CONTINUED INSERTION POINT>>

Ejecting burned-out motor casings is not allowed in NAR contests unless a streamer or parachute is attached to the ejected casing. 

==== Example Break-Apart Design ====

<<CONTINUED INSERTION POINT>>

=== Streamer and Parachute Recovery ===

Streamers and parachutes add drag to slow the rocket descent rate. Generally, a larger streamer is always better. But, streamer size is an example of the principle of diminishing marginal returns, eventually making a streamer larger will only add slightly increase drag (a rocket weighing more than 10 oz is beyond the effective use of a streamer). On the other hand, because of their efficiency, parachutes create more drag with less cloth than any other method, and virtually all high power rockets use parachutes. 

==== Example Streamer Design ====

<<INSERTION POINT>>

NAR requires 10 square cm of streamer area per gram of mass in contest models.

==== Example Parachute Design ====

<<INSERTION POINT>>

NAR requires 5 square cm of parachute area per gram of mass in contest models.

=== Helicopter and Gliding Recovery ===

==== Helicopter Recovery ====

Helicopter recovery relies upon rigid lift-generating blades and auto-rotation to slow terminal velocity. This design technique is the most complicated of all, and requires that the entire rocket be designed around the recovery device. As important, the stresses generated by rapidly spinning blades hitting the ground effectively limits the use of this technique to low mass (model) rockets. 

==== Gliding Recovery ====

A glider uses aerodynamic lift to control terminal velocity. However, because the aerodynamic requirements of vertical flight are vastly different than gliding flight, to make this transition there must be a shift in the center of gravity or the center of pressure. This transition can be made by reducing mass (ejecting the motor mount tube and weights) or changing aerodynamic signature (ejection activated fin-elevators or swing-wings). Radio and other control systems are currently being used to fly gliding recovery rockets, even high power. 

==== Example Design ====

<<INSERTION POINT>>

== Protecting Recovery Components ==

<<INSERTION POINT>>

=== Heat Shields ===

<<INSERTION POINT>>

==== Fire Resistant Wading and Blankets ====

<<INSERTION POINT>>

==== Piston Ejection ====

<<INSERTION POINT>>

=== Ejection Gas Cooling ===

<<INSERTION POINT>>

==== Cooling Mesh ====

<<INSERTION POINT>>

==== Baffles ====

<<INSERTION POINT>>

=== CO2 Ejection Devices ===

<<INSERTION POINT>>

= Tube Fins and Ring Tails =

== Tube Fins ==

A tube fin is just that, using a shorter section of body tube, adhered to the main body tube, as a fin, with or without other flat fins. Although this type of rocket is easy enough to build, creating an accurate simulation can be anything but.

 The aerodynamic flight of a rocket is affected by both how far the tip of a fin is from the body of the rocket and the surface area and profile of the fin. Using a 1 inch diameter tube, 2" long as an example, the tube fin has a surface area equal to pi (22/7) times the tube diameter times its length, or about 6 square inches. But, looking at the tube fin from the side (in profile), its area is length times height (the tube diameter), or about 2 square inches. Dividing the former by the later, three "flat" fins are aerodynamically about the same as one tube fin.

 So, to simulate tube fins, for each tube fin, three flat fins having the same profile as the tube fin are substituted. One tube fin equals three flat fins, two tube fins equals six flat fins, and so on. OpenRocket allows a maximum of eight fins per fin set, so six tube fins of the same kind can be represented by six fin sets (each containing three flat fins), or by three fin sets (two containing eight flat fins and one containing two flat fins). Just be aware that the Too many parallel fins warning in OpenRocket activates when more than eight total fins are created, and this warning appears in the results of every flight simulation.

 How does that work in OpenRocket? First, load the Simple model rocket example:

1.        At the OpenRocket main window, left-click the File menu, then left-click Open example design in the drop-down menu.
2.        In the pop-up Open example design box, left-click the "A simple model rocket" selection, then left-click the Open button.

=== Tubes as Fins ===

 Keeping in mind how tube fin simulation is done as described above, the Simple model rocket example design is converted to six tube fins, each with a 45 degree slant on the leading edge, following these steps:

3.        Double left-click the Body tube component in the Rocket design view, and write down the Wall thickness of the tube.
4.        Double left-click the Trapezoidal fin set component in the Rocket design view.
5.        Change the Number of fins to 6 (six tube fins).
6.        Change the Root chord to 2 cm.
7.        Change the Tip chord to 1 cm.
8.        Change the Height to 1 cm.
9.        Change the Sweep angle to 45 degrees (the Sweep length will automatically calculate).
10.      Change the Thickness to match the fin tube Wall thickness from Step 3 (.039).
11.      Now, to create flat fin sets for each tube fin, left-click the Split fins button.

 At this point, six individual fin sets have been created, each fin set containing one fin.

12.      Next, double left-click Trapezoidal fin set #1, and change the Number of fins to 3. Make sure the Fin rotation is 0 degrees, then left-click the Close button.
13.      Left-click the Back view button so that you can see the fin angles for the remaining steps.
14.      Double left-click Trapezoidal fin set #2, and change the Number of fins to 3. Change the Fin rotation to 20 degrees (360 degrees divided by 18 fins), then left-click the Close button.
15.      Double left-click Trapezoidal fin set #3, and change the Number of fins to 3. Change the Fin rotation to the previous rotation plus 20 degrees (20 degrees + 20 degrees = 40 degrees), then left-click the Close button.
16.      Repeat the previous step for each of the remaining fin sets, increasing the Fin rotation by an additional 20 degrees for each set (0, then 20, then 40 then 60, and so on).

 At this point, each fin set contains 3 fins, 18 fins in all.
17.      Now, rotate the launch lug so that it is between fins. Double left-click the Launch lug component and change the Radial position to 10 degrees, then left-click the Close button.

 The conversion is complete. Left-click the Side view button to see the completed rocket in profile.

 By adjusting the Tip chord length and Sweep angle, tube fin angles from 90 degrees to virtually any other angle can be created.

=== Tube Around Each Fin ===

 This section describes how to convert a simple model rocket design to flat fins with tube fins surrounding each at the trailing edge. The tube fins are the same diameter as the main body tube.

 Beginning with the Simple model rocket example started above, modify the main flat fins as follows:

3.        Double left-click the Body tube component in the Rocket design view window, and write down the Outer Diameter, Inner Diameter, and Wall thickness, (2.5, 2.3, and .1 cm). Then, left-click the Close button.
4.        Double left-click the Trapezoidal fin set component in the Rocket design view window.
5.        Change the Root chord to 8 cm.
6.        Change the Tip chord to 2 cm.
7.        Change the Height to the outside diameter of the tube fin, 2.5 cm.
8.        Change the Sweep length to 6 cm (the Sweep angle will automatically calculate).

 Now, the main flat fins need to be converted from trapezoid to freeform, and then notched to accept the tube fins.

9.        Left-click the Convert to freeform button.
10.      Left-click the Shape tab.
11.      On the graph of the fin, left-click on a fin line to create a new coordinate, and repeat doing so in different places until there are seven coordinate boxes.
12.      In the x/y table, change the coordinates to the following points:
               0 | 0
               6 | 2.5
               6 | 2.4
               8 | 2.4
               8 | 0.1
               6 | 0.1
               6 | 0.1
13.      Then reposition the fin, left-clicking the General tab, and changing the Relative position to - plus to "-2" cm. Then, left-click the Close button.

 Now that the main flat fins are done, its time to add the surrounding tube fins.

14.      Left-click the Body tube component in the Rocket design view window, then, in the Add a new component window, left-click Trapezoidal fin set.

15.      Change the Number of fins to 3 (three tube fins).
16.       Change the Root chord to 2 cm.
17.      Change the Tip chord to 2 cm.
18.      Change the Height to 2.5 cm, the inside diameter of the tube.
19.      Change the Sweep length to 0 cm (the Sweep angle will automatically calculate).
20.      Change the Thickness to .1 cm.
21.      Now, create substitute flat fin sets for each tube fin, left-click the Split fins button.

 At this point, three individual trapezoidal fin sets have been created, each fin set containing one fin.

22.      Left-click the Back view button so that you can see the fin angles for the remaining steps.
23.      Double left-click Trapezoidal fin set #1, and change the Number of fins to 3. Change the Fin rotation to 30 degrees (360 degrees divided by 12 fins [9 tube fins plus 3 flat fins]), then left-click the Close button.
24.      Double left-click Trapezoidal fin set #2, and change the Number of fins to 3. Change the Fin rotation to the previous rotation plus 30 degrees (30 degrees + 30 degrees = 60 degrees), then left-click the Close button.
25.      Double left-click Trapezoidal fin set #2, and change the Number of fins to 3. Change the Fin rotation to the previous rotation plus 30 degrees (60 degrees + 30 degrees = 90 degrees), then left-click the Close button.

 At this point, the rocket has three trapezoidal fin sets containing 3 fins each, plus the 3 flat fins, 12 fins in all.

26.      To finish, rotate the launch lug so that it is between fins. Double left-click the Launch lug component and change the Radial position to 15 degrees, then left-click the Close button.

 The conversion is complete. Left-click the Side view button to see the completed rocket in profile. Although the tube notches can be seen, separate from the substitute tube fins, this design is the aerodynamic equivalent for simulation purposes.

== Ring Tails ==

<<INSERTION POINT>>

= Through-the-Wall Fin Mounting =

Model rocket fins are usually glued to the surface of an airframe. However, when higher thrust motors are used (E and above) the increased thrust can literally rip fins off or shoot a motor up through the airframe. Instead, "through-the-wall" (TTW) mounting refers to fins that protrude through a slot in the airframe and are glued to the motor mount tube, one or more centering rings, and the airframe surrounding the slot. This construction technique significantly strengthens fin joints and motor mounts. 

There are three measurements necessary to create a fin tab: tab length, tab height, and tab position.
           •          Tab length is the distance from one side of the fin tab to the other. This is also the length of the slot that is cut through the airframe, the distance between the inside edges of the outermost centering rings.
           •          Tab height is the distance from outside of the airframe to the outside of the motor mount tube. This is calculated as follows: (BT OD - MMT OD) / 2, where BT is the airframe body tube and MMT is the motor mount tube diameters.
           •          Tab position is the distance from the root chord reference point to the fin tab reference point. OpenRocket features three choices:
Relative to:
                       -          the chord root leading edge – the tab position is the distance from the fin chord root leading edge to the fin tab leading edge. 
                       -          the chord root midpoint – the tab position is the distance from the fin chord root midpoint to the fin tab midpoint.
                       -          the chord root trailing edge – the tab position is the distance from the fin chord root trailing edge to the fin tab trailing edge. 
 
OpenRocket will automatically calculate fin tab dimensions, within the following constraints:
           •          If there are no centering rings beneath a fin, the trailing edge of the fin tab is the fin chord trailing edge and the leading edge of the fin tab is the fin chord leading edge.
           •          If only one centering ring is beneath a fin, the trailing edge of the fin tab is the fin chord trailing edge and the leading edge of the fin tab is the trailing edge of the centering ring.
           •          If two centering rings are beneath a fin, the trailing edge of the fin tab is the leading edge of the trailing centering ring and the leading edge of the fin tab is the trailing edge of the leading centering ring.
           •          If more than two centering rings are beneath a fin, referring to the centering rings in order from the trailing edge to the leading edge of the fin chord, the trailing edge of the fin tab is the leading edge of the first centering ring and the fin tab leading edge is the trailing edge of the second centering ring. OpenRocket supports only one fin tab on each fin.
 

Converting a simple rocket to through-the-wall design:
1.        At the OpenRocket main window, left-click the File menu, then left-click Open example design in the drop-down menu.
2.        In the pop-up Open example design box, left-click the "A simple model rocket" selection, then left-click the Open button.
3.        In the Rocket design view, double left-click the Trapezoidal fin set component.
4.        Left-click the Fin tabs tab.
5.        Left-click the Calculate automatically button.
And, a through-the-wall fin tab is automatically created between the two motor mount centering rings.

= Electronic and Dual Deployment =

<<INSERTION POINT>>

= Clustering and Multi-staging =

Complex rockets fall into two basic categories, a rocket that is propelled by a cluster of motors intended to be simultaneously ignited or multi-staged (massively-staged), propelled by a series of motors that successively ignite the next in line when the prior motor burns out.

== Motor Clustering ==

<<INSERTION POINT>>

== Conventional Staging ==

A "closed-hull" design with a separating airframe in which finned-stages holding motors are stacked up, and lower stages holding burned-out casings separate under pressure as upper stages ignite. Conventional staging is inherently limited to three stages because of the "Pisa Effect" which results in an increasing arcing trajectory with each stage.

<<CONTINUE INSERTION POINT>>

== Rack Staging ==

An "open-hull" design with a non separating airframe in which motors are staked up, end-to-end, in a frame, and only the burned-out casings are ejected under pressure as higher stages ignite, stage-after-stage. So long as high average impulse lower stage motors are used to ensure adequate initial velocities, rack staging is not inherently limited because this design overcomes the "Pisa Effect."

<<CONTINUE INSERTION POINT>>

= Roll Stabilization =

<<INSERTION POINT>>

= Regulatory Concerns =

Rocketry is subject to regulation by federal, state, and local governments, and most of the regulations that rocketeers must follow are promulgated by the National Fire Protection Association (NFPA) and the Federal Aviation Administration (FAA). The NFPA divides rockets into two major classifications, model rockets (NFPA § 1122) and high power rockets (NFPA § 1127), the difference primarily being weight and power, as follows:

           •          Model Rocket. A rocket vehicle that weighs no more than 1500 g (53 oz) with motors installed, is propelled by one or more model rocket motors having an installed total impulse of no more than 320 N-sec (71.9 lb-sec), and contains no more than a total of 125 g (4.4 oz) of propellant weight. (NFPA § 1122, subd. 3.3.7.2.)

           •          High Power Rocket. A rocket vehicle that weighs more than 1500 g (53 oz) with motors installed and is either propelled by one or more high power rocket motors or by a combination of model rocket motors having an installed total impulse of more than 320 N-sec (71.9 lb-sec). (NFPA §1127, subd. 3.3.13.1.)

Within the high power rocket classification, a subclassification for “complex” rockets is defined as a high power rocket that is multi-staged or propelled by a cluster of two or more rocket motors. (NFPA §1127, subd. 3.3.13.1.1.) And, a high power rocket launched with an installed total impulse greater than 2,560 N-sec (576 lb-sec) must have an electronically actuated recovery system. (NFPA §1127, subd. 4.10.2.) 

== National Association of Rocketry ==
National Association of Rocketry pursuits the goal of safe, fun and educative sport rocketry. It is the oldest and largest sport rocketry organization in the world. Visit dedicated [http://en.wikipedia.org/wiki/National_Association_of_Rocketry Wiki page] or [http://www.nar.org/ NAR official website] for more information.

The major work of the NAR includes, but not limited to:
* Certification of Rocketry-Related products and establishment of safety codes
The NAR is a recognized authority for safety certification of consumer rocket motors and user certification of high- power rocket fliers in the U.S. It plays a major role in establishment of safety codes for the hobby used and accepted by manufacturers and public safety officials nationwide.
* Certification of experienced rocketeers
NAR issues three levels of High Power Rocketry (HPR) certificates, Level 1 (L1) through Level 3 (L3). Certificates are necessary to purchase powerful rocket motor components.
* Communication with public officials
The NAR helps in communication with local public safety officials, and government regulatory agencies such as the Department of Transportation, Federal Aviation Administration, Bureau of Alcohol Tobacco Firearms and Explosives, and Consumer Product Safety Commission.
* Other work
The NAR publishes the bimonthly color magazine Sport Rocketry (sent to each member and selected libraries and newsstands around the nation). The NAR provides a wide range of other services to its members, including: education programs; national and local competitions; grants to teachers and scholarships for student members; flight performance record recognition; liability insurance; and publication of technical literature.

== Tripoli Rocketry Association ==

<<INSERTION POINT>>

= User Guide Contributions =

''Use the clustered, staged and dual-deploy example designs to cover the more advanced motor and recovery configuration options. Talk about using mass and CG overrides to improve accuracy.''
''Special designs that might have their own sub-chapters:'' 
''- clusters + staged (including rack rocket (http://sourceforge.net/apps/phpbb/openrocket/viewtopic.php?f=3&t=28))'' 
''- dual-deploy and other more advanced recovery options (if we can think of any)'' 
''- roll stabilization'' 

''It would be good to include a description on how the different components affect the simulations and what the limits are (e.g. an inner tube won’t affect the aerodynamics even if you move it outside of the body tube).''
 

----
<div style="text-align: center;">
<div style="float: left;">[[Basic Rocket Design|← Basic Rocket Design]]</div>
<div style="float: right;">[[Advanced Flight Simulation|Advanced Flight Simulation →]]</div>
[[User's Guide|↑ Back to Contents]]
</div>

User talk:Elrond Peredhil

2015-03-06T02:47:57Z

Anton: Downloading and Installing page duplicate?

Hello,

I had added some info to the [http://wiki.openrocket.info/Application_installation_(especially_for_people_not_real_familiar_with_Java) Application installation (especially for people not real familiar with Java)] and noticed that it is a duplicate of [http://wiki.openrocket.info/Downloading_%26_Installing Downloading and Installing]. Is there a significant distinction between two articles? If no, I'll merge them.

Thank you,
Anton.

Application installation (especially for people not real familiar with Java).

2015-03-06T02:13:18Z

Anton: /* Mac OS X Users */ Added information on different sources of Java updates depending on software version.

OpenRocket is a Java application - the reason that you need to know that is that some systems don't have Java installed.

== General ==
Here are the general steps you'll need to take. System-specific instructions are available below.
# make sure you have Java available
# [https://sourceforge.net/projects/openrocket/files/openrocket/14.11/OpenRocket-14.11.jar/download download] the OpenRocket application
# open the application and use it

== Windows Users ==
The installation is the most difficult because Java doesn't automatically ship with Windows. You may already have Java available because lots of other apps are built on it (i.e. virus scanners, other open source software, etc.). If you don't have Java on your computer already, then you'll need to download it from Sun; it is free.
# [http://www.java.com/getjava/ download Java 8 JRE] from Sun
# [https://sourceforge.net/projects/openrocket/files/openrocket/14.11/OpenRocket-14.11.jar/download download] the OpenRocket application
# open the application and use it

== Mac OS X Users ==
If your computer runs OS X 10.7.2 or older version, then it receives Java updates from Apple. A common complication in this case is that most Mac's have Java 5 and Java 6 installed and Java 5 is the default. If you try to use OpenRocket and get an error, then you probably have Java 5 as the default still.
# open the Utilities folder (Finder -> Go -> Utilities) [[File:FinderOpenUtilities.png|none|200px]]
# open the Java Preferences Application (double-click Java Preferences.app) [[File:UtilitiesJavaPreferences.png|none|200px]]
# in the bottom section of the window that opens, drag Java 6 to top of list [[File:JavaApplicationPreferences.png|none|200px]]
If Mac runs 10.7.3 (Lion) or later, then the updates are delivered directly by Oracle and you should not encounter any problems.
For more information on software versions, visit [https://www.java.com/en/download/faq/java_mac.xml Java official site].

== Linux Users ==
Some Linux distributions ship with Java, while others do not. Check to see if it is installed on your system.
# make sure you have [http://www.java.com/getjava/ Java] available
# [https://sourceforge.net/projects/openrocket/files/openrocket/14.11/OpenRocket-14.11.jar/download download] the OpenRocket application
# change permissions to allow the .jar to be executed
# open the application and use it

Application installation (especially for people not real familiar with Java).

2015-03-06T01:51:19Z

Anton: /* Linux Users */ Updated link for OpenRocket download from 0.9.4 to 14.11; corrected the link for Java

OpenRocket is a Java application - the reason that you need to know that is that some systems don't have Java installed.

== General ==
Here are the general steps you'll need to take. System-specific instructions are available below.
# make sure you have Java available
# [https://sourceforge.net/projects/openrocket/files/openrocket/14.11/OpenRocket-14.11.jar/download download] the OpenRocket application
# open the application and use it

== Windows Users ==
The installation is the most difficult because Java doesn't automatically ship with Windows. You may already have Java available because lots of other apps are built on it (i.e. virus scanners, other open source software, etc.). If you don't have Java on your computer already, then you'll need to download it from Sun; it is free.
# [http://www.java.com/getjava/ download Java 8 JRE] from Sun
# [https://sourceforge.net/projects/openrocket/files/openrocket/14.11/OpenRocket-14.11.jar/download download] the OpenRocket application
# open the application and use it

== Mac OS X Users ==
Apple sends out Java with system updates. A common complication with Mac users is that most Mac's have Java 5 and Java 6 installed and Java 5 is the default. If you try to use OpenRocket and get an error, then you probably have Java 5 as the default still.
# open the Utilities folder (Finder -> Go -> Utilities) [[File:FinderOpenUtilities.png|none|200px]]
# open the Java Preferences Application (double-click Java Preferences.app) [[File:UtilitiesJavaPreferences.png|none|200px]]
# in the bottom section of the window that opens, drag Java 6 to top of list [[File:JavaApplicationPreferences.png|none|200px]]

== Linux Users ==
Some Linux distributions ship with Java, while others do not. Check to see if it is installed on your system.
# make sure you have [http://www.java.com/getjava/ Java] available
# [https://sourceforge.net/projects/openrocket/files/openrocket/14.11/OpenRocket-14.11.jar/download download] the OpenRocket application
# change permissions to allow the .jar to be executed
# open the application and use it

Application installation (especially for people not real familiar with Java).

2015-03-06T01:48:17Z

Anton: /* General */ Updated link for OpenRocket download

OpenRocket is a Java application - the reason that you need to know that is that some systems don't have Java installed.

== General ==
Here are the general steps you'll need to take. System-specific instructions are available below.
# make sure you have Java available
# [https://sourceforge.net/projects/openrocket/files/openrocket/14.11/OpenRocket-14.11.jar/download download] the OpenRocket application
# open the application and use it

== Windows Users ==
The installation is the most difficult because Java doesn't automatically ship with Windows. You may already have Java available because lots of other apps are built on it (i.e. virus scanners, other open source software, etc.). If you don't have Java on your computer already, then you'll need to download it from Sun; it is free.
# [http://www.java.com/getjava/ download Java 8 JRE] from Sun
# [https://sourceforge.net/projects/openrocket/files/openrocket/14.11/OpenRocket-14.11.jar/download download] the OpenRocket application
# open the application and use it

== Mac OS X Users ==
Apple sends out Java with system updates. A common complication with Mac users is that most Mac's have Java 5 and Java 6 installed and Java 5 is the default. If you try to use OpenRocket and get an error, then you probably have Java 5 as the default still.
# open the Utilities folder (Finder -> Go -> Utilities) [[File:FinderOpenUtilities.png|none|200px]]
# open the Java Preferences Application (double-click Java Preferences.app) [[File:UtilitiesJavaPreferences.png|none|200px]]
# in the bottom section of the window that opens, drag Java 6 to top of list [[File:JavaApplicationPreferences.png|none|200px]]

== Linux Users ==
Some Linux distributions ship with Java, while others do not. Check to see if it is installed on your system.
# make sure you have [https://sourceforge.net/projects/openrocket/files/openrocket/OpenRocket-0.9.4.jar/download Java] available
# [https://sourceforge.net/projects/openrocket/files/openrocket/OpenRocket-0.9.4.jar/download download] the OpenRocket application
# change permissions to allow the .jar to be executed
# open the application and use it

Application installation (especially for people not real familiar with Java).

2015-03-06T01:36:35Z

Anton: /* Windows Users */ Updated the OpenRocket download link from 0.9.4 to 14.11

OpenRocket is a Java application - the reason that you need to know that is that some systems don't have Java installed.

== General ==
Here are the general steps you'll need to take. System-specific instructions are available below.
# make sure you have Java available
# [https://sourceforge.net/projects/openrocket/files/openrocket/OpenRocket-0.9.4.jar/download download] the OpenRocket application
# open the application and use it

== Windows Users ==
The installation is the most difficult because Java doesn't automatically ship with Windows. You may already have Java available because lots of other apps are built on it (i.e. virus scanners, other open source software, etc.). If you don't have Java on your computer already, then you'll need to download it from Sun; it is free.
# [http://www.java.com/getjava/ download Java 8 JRE] from Sun
# [https://sourceforge.net/projects/openrocket/files/openrocket/14.11/OpenRocket-14.11.jar/download download] the OpenRocket application
# open the application and use it

== Mac OS X Users ==
Apple sends out Java with system updates. A common complication with Mac users is that most Mac's have Java 5 and Java 6 installed and Java 5 is the default. If you try to use OpenRocket and get an error, then you probably have Java 5 as the default still.
# open the Utilities folder (Finder -> Go -> Utilities) [[File:FinderOpenUtilities.png|none|200px]]
# open the Java Preferences Application (double-click Java Preferences.app) [[File:UtilitiesJavaPreferences.png|none|200px]]
# in the bottom section of the window that opens, drag Java 6 to top of list [[File:JavaApplicationPreferences.png|none|200px]]

== Linux Users ==
Some Linux distributions ship with Java, while others do not. Check to see if it is installed on your system.
# make sure you have [https://sourceforge.net/projects/openrocket/files/openrocket/OpenRocket-0.9.4.jar/download Java] available
# [https://sourceforge.net/projects/openrocket/files/openrocket/OpenRocket-0.9.4.jar/download download] the OpenRocket application
# change permissions to allow the .jar to be executed
# open the application and use it