ORIGINAL: kytwister
Hey Guys,
This my first time posting anything but I hope someone can help. I just sold my Dragonfly #35 to a friend to purchase the #36. He brought the 35 back saying it wouldn't get of the ground. When I checked it out, the collective server is now pulling the collective down rather than pushing up which as you increase throttle it pushes the heli down rather than providing lift. The thing flew beautiful before I sold and I can't find a way that my buddy could have even changed it. The servo control arm is even too short to switch sides. The throttle gimble still woks as it did so he didn't reverse the transmitter. Its like the servo changed polarity or something. Any ideas?
Keep a couple of things in mind...
A - As already posted, the switch in the back for the pitch angle could be reversed.
This will cause the blade pitch angles to be backward for a given throttle setting as you describe.
B - The pitch slider central plastic block or pin, is not held very well. The inertia of the main blades are enough to cause the blades to continue to spin while the motor is already stopped. This effectively "screws" the pitch slider linkage "INTO" the plastic block, changing the pitch angle, if the motor is stopped.
The blades do not have to hit anything for this to happen. Since the motor exerts a bit of a stopping force, in spite of the autorotation gearing, it is enough to screw the link into the plastic block.
If you take it apart you'll see what I mean.
I doubt that this is the problem here, but it is something that anyone owning a #35 or #36 should be aware of.