Re: Partial Motors

From: calgoddard <calgoddard_at_yahoo.com>
Date: Tue, 05 Dec 2006 16:08:12 -0000

Bill -

Thanks for your input.

Yes, when our team flies with half-motors, a 1.0 gram dummy motor
stick is used that is half the length between the prop hook and the
rear motor hook. Obviously, the dummy motor stick connects the rear
end of the rubber motor to the rear motor hook.

Our team members don't like O-rings on the rubber motors. Their
eyesight and dexterity are so good, they don't need them and prefer
pinching off a loop of rubber at each end for subsequent attachment
as they take the wound rubber motor off the winder and torque meter.
As the coach, I am obviously an older guy who personally enjoys the
conveience of O-rings.

You are correct about the time issue. One of our team's planes
exhibits some motor stick twist at high torque, which temporarily
takes out some stab tilt, widening the radius of the circular flight
path. This lasts twice as long with a full motor, than with a half
motor, so launch trajectory has to be adjusted to avoid colliding
with a wall. Its not much of an issue with the half motor.

We have noticed what is apparently a power stall on one occasion.
The plane, otherwise trimmed pretty well, seemed to climb so steeply
that it stalled and then recovered. The rest of the flight was just
fine. I guess if the torque is too high, this is the result?

Calgoddard
Received on Tue Dec 05 2006 - 08:16:14 CET