[acheli] Archer's Helicopter

The beta test version allows for smooth single-player flight, but it becomes very laggy in multiplayer.

keyboards: J - Push the helicopter’s collective pitch lever forward. N - Pull the helicopter’s collective pitch lever backward. B - Push the helicopter’s collective roll lever to left. M - Push the helicopter’s collective roll lever to right.

Right-Alt - engine switch (long press to open/shutdown)

Up - Pull up the total distance lever Down - Push down the total distance lever Left - Yaw-angle turn left Right - Yaw-angle turn right