24
9. Trim Flight
To achieve perfect flight performance, you will need to trim your heli.
This will not take much time, if you have done your assembly work
properly. The center of gravity should coincide with the center axis of
the main rotor shaft, and the mechanics of your machine must be set
up properly as described earlier. On IC powered helis, make the trim
flight with the fuel tank half full. This is the best compromise to
compensate for the shifting center of gravity on most IC powered
helis.
Autotrim is activated in your VBar software by checking the appropriate
box. At the flight line, turn on your heli with the collective stick at full
positive. Use throttle hold to prevent the motor from starting, until
you are ready to fly. Wait until you see a double twitch. The first
twitch confirms successful initialization; the second acknowledges
activation of the Autotrim mode.
Make your trim flight in calm conditions. The less wind, the more
spot-on your trims will be.
Autotrim is active while positive collective is input, even on the ground.
This is why we suggest the following procedure:
Turn on your heli with the collective pitch at full positive at the takeoff-
point at your field. Move the pitch lever to zero collective after you see
the double twitch/pitch bounce, and start the motor. Take off as soon
as you can, without rushing.
To Next Page
Loading...
Need help?
General
