When mapping analogue collective (helicopter) to an analogue input on the 360 pad such as right stick or triggers the full range of the collective is not availiable. in the configuration screen for the controller you can see that the inputs give the correct full values of -100 and 100, but in game this only translates to about 50% of the collective's full range.
This severly hampers the ability to fly with this control setup, the Mi-48 wont even lift off more than about a meter.