Two ways to do this (more actually but these will do)...
1. Check out the sample configs that BIS provided here
2. Download the AIO Config (All In One Config). This post references where to get it.
Oh, by the way, the base class is Helicopter_Base_H and all the helos inherit from this (light, medium, heavy and Hind/Gunship). This in turn inherits from Helicopter which inherits from Air (I will stop now!).
The child classes are;