+ // Cos_beta * Cos_beta corrects V_rel_wind to get normal q onto wing,
+ // hence Cos_beta * Cos_beta term included.
+ // Same thing is done w/ moments below.
+ // Without this "die-off" function, lift would be produced in a 90 deg sideslip, when
+ // that should not be the case. See FGFS notes 021105