FAQ - Revision history

2003:E3:6F20:7B00:6CE0:C2EA:E0DE:F673: /* Why are my ground-hit velocities so inaccurate, so high? */

2023-04-12T17:25:26Z

Why are my ground-hit velocities so inaccurate, so high?

← Older revision		Revision as of 17:25, 12 April 2023
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	=== Why are my ground-hit velocities so inaccurate, so high? ===		=== Why are my ground-hit velocities so inaccurate, so high? ===

	OpenRocket uses atmospheric conditions to simulation the rocket ~~desent~~ rate and ground hit velocity. And, each individual simulation has its own atmospheric conditions settings. The most common indicator that your atmospheric conditions settings may be incorrectly set is when one motor appears to have the correct ground-hit velocity and other motors show ground hit velocities that are much higher than expected, even 10 times higher.		OpenRocket uses atmospheric conditions to simulation the rocket descent rate and ground hit velocity. And, each individual simulation has its own atmospheric conditions settings. The most common indicator that your atmospheric conditions settings may be incorrectly set is when one motor appears to have the correct ground-hit velocity and other motors show ground hit velocities that are much higher than expected, even 10 times higher.

	Your atmospheric conditions settings may be adjusted on the <i>Edit</i> → <i>Preferences</i> → <i>Launch</i> tab, in the <i>Atmospheric conditions</i> section.		Your atmospheric conditions settings may be adjusted on the <i>Edit</i> → <i>Preferences</i> → <i>Launch</i> tab, in the <i>Atmospheric conditions</i> section.

IBHCM2: /* What's the effect of the fin cross-section shapes? */

2023-02-04T16:25:08Z

What's the effect of the fin cross-section shapes?

← Older revision		Revision as of 16:25, 4 February 2023
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	=== What's the effect of the fin cross-section shapes? ===		=== What's the effect of the fin cross-section shapes? ===

	OpenRocket features three fin cross-section choices: (1) ''square'', (2) ''rounded'', and (3) ''airfoil'', but doesn't simulate actual airfoils. OpenRocket assumes "square" fins, then adjusts the pressure and base drag ~~based~~ if another fin profile is selected. The pressure drag of the "rounded" profile is less than that of the "square" profile, and the "airfoil" profile has the same pressure drag as that of the "round" profile, but has no base drag.		OpenRocket features three fin cross-section choices: (1) ''square'', (2) ''rounded'', and (3) ''airfoil'', but doesn't simulate actual airfoils. OpenRocket assumes "square" fins, then adjusts the pressure and base drag if another fin profile is selected. The pressure drag of the "rounded" profile is less than that of the "square" profile, and the "airfoil" profile has the same pressure drag as that of the "round" profile, but has no base drag.

	</br>		</br>

IBHCM2: /* What's the effect of the fin cross-section shapes? */

2023-02-04T16:24:01Z

What's the effect of the fin cross-section shapes?

← Older revision		Revision as of 16:24, 4 February 2023
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	=== What's the effect of the fin cross-section shapes? ===		=== What's the effect of the fin cross-section shapes? ===

	OpenRocket features three fin cross-section choices: (1) square, (2) rounded, and (3) airfoil, but doesn't ~~actually~~ simulate airfoils. OpenRocket assumes "square" fins, then adjusts the pressure and base drag based ~~on the selected~~ fin profile. The pressure drag of the "rounded" profile is less than that of the "~~squared~~" profile, and "~~airfoiled~~" profile has the same pressure drag as that of the "~~rounded~~" profile, but no base drag.		OpenRocket features three fin cross-section choices: (1) ''square'', (2) ''rounded'', and (3) ''airfoil'', but doesn't simulate actual airfoils. OpenRocket assumes "square" fins, then adjusts the pressure and base drag based if another fin profile is selected. The pressure drag of the "rounded" profile is less than that of the "square" profile, and the "airfoil" profile has the same pressure drag as that of the "round" profile, but has no base drag.

			</br>

	=== Why does my phantom body tube outer diameter change when I open a saved design? ===		=== Why does my phantom body tube outer diameter change when I open a saved design? ===

IBHCM2: /* Questions and Answers */

2023-02-04T16:20:06Z

Questions and Answers

← Older revision		Revision as of 16:20, 4 February 2023
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	== Questions and Answers ==		== Questions and Answers ==

			=== What's the effect of the fin cross-section shapes? ===

			OpenRocket features three fin cross-section choices: (1) square, (2) rounded, and (3) airfoil, but doesn't actually simulate airfoils. OpenRocket assumes "square" fins, then adjusts the pressure and base drag based on the selected fin profile. The pressure drag of the "rounded" profile is less than that of the "squared" profile, and "airfoiled" profile has the same pressure drag as that of the "rounded" profile, but no base drag.

	=== Why does my phantom body tube outer diameter change when I open a saved design? ===		=== Why does my phantom body tube outer diameter change when I open a saved design? ===

IBHCM2: /* Why does my phantom body tube outer diameter change when I open a saved design? */

2023-01-20T00:00:37Z

Why does my phantom body tube outer diameter change when I open a saved design?

← Older revision		Revision as of 00:00, 20 January 2023
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	If you are experiencing this issue, merely open the design, set the outer diameter of the affected component to the desired value, and re-save the design. The design should then reopen without changing the outer diameter of a previously affected component.		If you are experiencing this issue, merely open the design, set the outer diameter of the affected component to the desired value, and re-save the design. The design should then reopen without changing the outer diameter of a previously affected component.

			</br>

	=== Why can't I always cut and paste between two designs? ===		=== Why can't I always cut and paste between two designs? ===

IBHCM2: /* Questions and Answers */

2023-01-20T00:00:14Z

Questions and Answers

← Older revision		Revision as of 00:00, 20 January 2023
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	== Questions and Answers ==		== Questions and Answers ==

			=== Why does my phantom body tube outer diameter change when I open a saved design? ===

			==== Why it happens: ====

			In OpenRocket versions 22.02.beta.05 and earlier that featured an automatic outer diameter option in the component configuration pane, the automatic outer diameter option was available ''even when there wasn't a component with a diameter to reference''. After the release of OpenRocket 22.02.beta.05, this was changed so that '''the outer diameter automatic option is only available when there a component to which the outer diameter can be referenced'''. If you saved a design using OpenRocket 22.02.beta.05 or an earlier version, and that design contained a component which had the automatic outer diameter checked, but for which that option is no longer allowed, the outer diameter of that component may change to the default diameter. So far, this issue appears limited to designs featuring pods with phantom body tube sub components.

			==== What to do: ====

			If you are experiencing this issue, merely open the design, set the outer diameter of the affected component to the desired value, and re-save the design. The design should then reopen without changing the outer diameter of a previously affected component.


	=== Why can't I always cut and paste between two designs? ===		=== Why can't I always cut and paste between two designs? ===

IBHCM2: /* Java 17 */

2023-01-14T00:32:24Z

Java 17

← Older revision		Revision as of 00:32, 14 January 2023
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	==== Java 17 ====		==== Java 17 ====

	For those using OpenRocket .jar files with Windows ~~10 and above~~, ~~beginning with~~ Beta 5~~, OpenRocket now functions~~ with Java 17 LTS, '''''but not without using a special instruction to start OpenRocket'''''. If you are such a user, you may start OpenRocket using Java 17 by executing the following instruction:		For those using OpenRocket .jar files with Windows, OpenRocket Beta 5 and above will function with Java 17 LTS, '''''but not without using a special instruction to start OpenRocket'''''. If you are such a user, you may start OpenRocket using Java 17 by executing the following instruction:

	java --add-exports=java.base/java.lang=ALL-UNNAMED --add-exports=java.desktop/sun.awt=ALL-UNNAMED --add-exports=java.desktop/sun.java2d=ALL-UNNAMED -jar OpenRocket.jar		java --add-exports=java.base/java.lang=ALL-UNNAMED --add-exports=java.desktop/sun.awt=ALL-UNNAMED --add-exports=java.desktop/sun.java2d=ALL-UNNAMED -jar OpenRocket.jar

IBHCM2: /* Java 17 */

2023-01-14T00:30:06Z

Java 17

← Older revision		Revision as of 00:30, 14 January 2023
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	==== Java 17 ====		==== Java 17 ====

	For those using OpenRocket .jar files with Windows 10 and above, beginning with Beta 5 ~~and above~~, OpenRocket now functions with Java 17 LTS, '''''but not without using a special instruction to start OpenRocket'''''. If you are such a user, you may start OpenRocket using Java 17 by executing the following instruction:		For those using OpenRocket .jar files with Windows 10 and above, beginning with Beta 5, OpenRocket now functions with Java 17 LTS, '''''but not without using a special instruction to start OpenRocket'''''. If you are such a user, you may start OpenRocket using Java 17 by executing the following instruction:

	java --add-exports=java.base/java.lang=ALL-UNNAMED --add-exports=java.desktop/sun.awt=ALL-UNNAMED --add-exports=java.desktop/sun.java2d=ALL-UNNAMED -jar OpenRocket.jar		java --add-exports=java.base/java.lang=ALL-UNNAMED --add-exports=java.desktop/sun.awt=ALL-UNNAMED --add-exports=java.desktop/sun.java2d=ALL-UNNAMED -jar OpenRocket.jar

IBHCM2: /* Java 17 */

2023-01-14T00:29:16Z

Java 17

← Older revision		Revision as of 00:29, 14 January 2023
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	==== Java 17 ====		==== Java 17 ====

	For those using OpenRocket .jar files with Windows 10 and above, OpenRocket now functions with Java 17 LTS, '''''but not without using a special instruction to start OpenRocket'''''. If you are such a user, you may start OpenRocket using Java 17 by executing the following instruction:		For those using OpenRocket .jar files with Windows 10 and above, beginning with Beta 5 and above, OpenRocket now functions with Java 17 LTS, '''''but not without using a special instruction to start OpenRocket'''''. If you are such a user, you may start OpenRocket using Java 17 by executing the following instruction:

	java --add-exports=java.base/java.lang=ALL-UNNAMED --add-exports=java.desktop/sun.awt=ALL-UNNAMED --add-exports=java.desktop/sun.java2d=ALL-UNNAMED -jar OpenRocket.jar		java --add-exports=java.base/java.lang=ALL-UNNAMED --add-exports=java.desktop/sun.awt=ALL-UNNAMED --add-exports=java.desktop/sun.java2d=ALL-UNNAMED -jar OpenRocket.jar

IBHCM2: /* Starting OpenRocket from a Desktop Shortcut (Recommended) */

2023-01-14T00:24:05Z

Starting OpenRocket from a Desktop Shortcut (Recommended)

← Older revision		Revision as of 00:24, 14 January 2023
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	Go to the file directory where OpenRocket.jar resides, then open a command prompt. Now type (or copy and paste) the instruction above on the command line and click enter. A command prompt window will then open, and OpenRocket will start and be ready to use, but the command prompt window must be manually closed.		Go to the file directory where OpenRocket.jar resides, then open a command prompt. Now type (or copy and paste) the instruction above on the command line and click enter. A command prompt window will then open, and OpenRocket will start and be ready to use, but the command prompt window must be manually closed.

	===== Starting OpenRocket from a Desktop Shortcut (Recommended) =====		===== Starting OpenRocket with Java 17 from a Desktop Shortcut (Recommended) =====

	For those running OpenRocket using a Desktop shortcut, you may simply open the OpenRocket shortcut's properties and replace the "Target" text with the above instruction (copy and paste to the “Target” line). After that, when the shortcut is used, a command prompt window will open, OpenRocket will start, and the command prompt window will close on its own, leaving OpenRocket open and ready to use.		For those running OpenRocket using a Desktop shortcut, you may simply open the OpenRocket shortcut's properties and replace the "Target" text with the above instruction (copy and paste to the “Target” line). After that, when the shortcut is used, a command prompt window will open, OpenRocket will start, and the command prompt window will close on its own, leaving OpenRocket open and ready to use.