The "Reduce engine effect when airborne" setting seems to inoperable. I've tried various values from 0-100 and can't find any value that reduces the engine effect (set to 50) when airborne. I've tried the Huey, various jets (A10CII, F18, Jeff, F14B), two maps (Caucasus and Syria), single and multiplayer. Previously in the DCS Debug View, IIRC, there was a value something along the lines of "on the ground" which is absent now (this could be by design, just throwing ideas against the wall)
DCS 2.7.9.18080, SSAbeta 2.3.2.0, SSSbeta 2.28