Hi Gary ... Ive wondered about this myself.

Found this section in YASim/Surface.cpp :

// Similar to the above -- interpolates out the flap lift past the
// stall alpha
float Surface::flapLift(float alpha)
    float flapLift = _cz * _flapPos * (_flapLift-1) * _flapEffectiveness;

Hopefully Andy can explain it in layman's term :)


On Tue, May 25, 2010 at 1:57 PM, Gary Neely <grneely@gmail.com> wrote:
I'd like to gain a better understanding of the "effectiveness" tag
available for YASim flight surfaces. Example from the F-14:

<hstab x="-6.565" y="2.301" z="-1.153" length="2.839" chord="3.674"
taper="0.3" sweep="45" dihedral="-2" camber="-0.01" effectiveness="2.0">

It's particularly common in hstab definitions. Since it isn't
mentioned in the distributed YASim documentation and I could not find
definitive explanations in message archives, I wonder if someone could
describe its purpose, practical uses, and pitfalls?

Thanks in advance,

-Gary, aka Buckaroo


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