Just an observation even though I guess you still have things to implement with helicopters to get them somewhere close to TKoH, but at the moment the most basic fundamental effects of wind is applied backwards to helicopters vs. the observation of cloud movement, angle/direction grass and small bushes or the direction smoke is blown, at the moment when the wind is blowing to the north (clouds, smoke, grass etc all blown that direction) if you fly a helicopter north (in the direction the wind is supposed to be blowing) you actually fly slower than you do flying south into the wind.
Logic and fact dictate that with the wind behind you, your ground speed should be higher than if you fly the opposite way into the wind, from my observations both your North/South and corresponding East/West are collectively backwards in their effect on helicopters.
e.g. with the MH-9, if you set maximum wind/gusts/overcast etc etc and with a direction of north, then fly North then South headings over the sea (a prolonged flat place) at maximum collective (not that you would in real life) you will attain ~ 174kph, if you fly south into the wind (opposing cloud, smoke, grass direction) you will reach ~ 216kph.
With SILLY use of “setWind [#, #, true];” to further perturb wind outside the range of the editor wind settings the backward nature of effect on helicopters is much more apparent with e.g. “setWind [0, 75, true];” negating movement in the MH-9 with the wind, yet seemingly allowing you to fly at high speed into the wind!