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question

boufogre avatar image
boufogre asked donstim commented

Lowest selectable speed

Hello,

The debug window indicates that the Lowest Selectable Speed is KIAS, but it actually is KTAS, cf the screenshot below:


1645970592730.png

By the way, it would be nice to have the possibility to activate or not this protection.

I would like to be able to fly under this speed for development and debugging purposes.

Thank you!

aircraftflightmodel
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1 Answer

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FlyingRaccoon avatar image
FlyingRaccoon answered donstim commented

Hello @boufogre

There's definitely an issue here but I'm not sure if it's the AP using the wrong speed or the lowest selectable speed being KTAS and not KIAS.
This is being investigated.

Regards,
Sylvain

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According to the SDK, this speed is set equal to 1.23 times the estimated stall speed. The SDK says the estimated stall speed is in units of KTAS (notwithstanding that IRL stall speeds are not provided in those units, it would be KIAS/KCAS for small airplane and KCAS for transport category airplanes).

Also, I don't know if a lowest selectable speed is generally applicable to all airplanes. And for those airplanes where it is applicable, it is not always 1.23 times the stall speed.

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