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propeller feather patch

Reviewing merge request #1572: Patch for Issue#772 to disable wind effect on ground for only Yasim.

src/FDM/YASim/Model.cpp
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  _body.pointVelocity(pos, lrot, out); // rotational velocity
  Math::mul3(-1, out, out); // (negated)
  Math::add3(lwind, out, out); // + wind
  /* This if statement is a patch for issue #772 to disable wind effect on ground */
  /* Once issue fixed this should be removed.*/
  if(getAGL() > 0.5)
  Math::add3(lwind, out, out); // + wind
  Math::sub3(out, lv, out); // - velocity
 
  //add the downwash of the rotors if it is not self a rotor

 

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