The IVO has a geared motor that drives a screw. The screw drives a device which goes fore and aft in the hub twisting the blades. The physical limits are placed on the device (fore and aft) via a series of washers with a plastic one which compresses for mechanical safety. The unit only draws current when the pitch is changed. Otherwise it is static and the prop stays in the last pitch setting.

 

Failure mode is that the prop will not change pitch-- it will  not flatten out like most standard oil press C/S props or increase pitch.

 

Rich

 

Why in the world would IVO use a device that is designed to fail critical flight gear in the case of improper control
manipulation when they don't have to? Isn't this the classical and proper application for a polyfuse? Polyfuses are
used in power windows for this exact reason. You're kids can pull on that switch all day without damaging the window
motor. I'm thinking of the case where a switch gets shorted (like my belt sander's switch is right now...the power cord
is serving as a temp fix until I get time), or someone accidentally leans something against the switch.

Why does the motor draw current after the pitch has been changed?

 

Lynn E. Hanover