diff --git a/src/FDM/YASim/Surface.cpp b/src/FDM/YASim/Surface.cpp index 2baa42baa..25d8da489 100644 --- a/src/FDM/YASim/Surface.cpp +++ b/src/FDM/YASim/Surface.cpp @@ -228,7 +228,7 @@ void Surface::calcForce(float* v, float rho, float* out, float* torque) // coordinates. Since out[] is now the force vector and is // roughly parallel with Z, the small-angle approximation // must change its X component. - out[0] -= incidence * out[2]; + out[0] += incidence * out[2]; // Convert back to external coordinates Math::tmul33(_orient, out, out);