me wrote:
> There is something funny with the propeller pitch control.

The cause of that is the lines defining minrpm and maxrpm in the propeller
definition file for An-2. Only fixed-speed propellers should have a minrpm
and maxrpm setting. See the test for fixed pitch/fixed speed/variable pitch
propellers in src/FDM/JSBSim/models/propulsion/FGPropeller.cpp,
FGPropeller::GetPowerRequired(void)
The test is basically "if minrpm == maxrpm (i.e. zero, not set), then it's a
variable pitch prop". The default value for either is 0 in the constructor.
(Not sure how one would go about to define a fixed speed prop where the rpm
cannot be varied the slightest.)

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