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JSBSim Thrusters: Difference between revisions
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→Sense: Adding info about bug affecting the sign of the gyroscopic effect created by 'sense' and how to address it
(Improve clarity of engine-thruster table) |
(→Sense: Adding info about bug affecting the sign of the gyroscopic effect created by 'sense' and how to address it) |
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===Sense bug affecting gyroscopic moment=== | |||
Prior to about 2015--and continuing in current JSBSim and FlightGear versions unless you take the corrective steps outlined below--a JSBSim bug cause the gyroscopic moment of the propeller to be reversed. | |||
To fix this bug and get the correct sign for your gyroscopic effect, you must add version="1.1" (or higher--any version greater than 1.0 should work) to your propeller definition, as shown in this example: | |||
<syntaxhighlight> | |||
<propeller name="prop" version="1.1"> | |||
<!-- propeller definition --> | |||
</propeller> | |||
</syntaxhighlight> | |||
The bug with the sign of gyroscopic effect and the fix are outlined under [https://sourceforge.net/p/jsbsim/bugs/110/ JSBSim Bug #110]. | |||
For most aircraft and engine/propeller systems the gyroscopic effect is fairly subtle and thus the bug is difficult to detect. But for some aircraft, such as small, light, rotary-engined WWI-era aircraft, the gyroscopic effect is very noticeable, and the reverse in direction of the effect created by the bug is very noticeable as well. | |||
=== Starter speed (for piston engines) === | === Starter speed (for piston engines) === | ||