Hey
Type this in the init field of you heli:
This setpos [(getpos this select 0),(getpos this select 1), 2]
Where it says '2' at the end there, type a number there to represent your altitude (In meters).
So if you have that exact script there, you heli will start at 2 meters from the ground.
O Neil
PS: Sure your typing Untiname flyinheight 2 ?