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[TowerTalk] Prop Pitch Doesn't Turn

Subject: [TowerTalk] Prop Pitch Doesn't Turn
From: Rob Frohne <>
Date: Mon, 12 Mar 2007 16:37:27 -0700
List-post: <>

A few years ago I purchased a couple of what I believe are small prop
pitch rotors.  Now that I have a need for them, I am trying to figure
out how to test them.  One of them I was able to use some of the ideas
on K7NV's web site to get turning with my 13 volt power supply.  It
turns at about 1/3 rpm.  The other prop pitch seems to have a brake in
it, and I have been able to get the brake to click down (though it seems
that it takes a lot more current than the other one's motor does), but
the motor doesn't move.  I have removed the aluminum housing, but not
the motor yet.  I think I have the right wires as there are three which
look like they were used before, and according to K7NV there is a common
and the other two determine which direction it should turn.  I think
this prop pitch was used to turn a Sky Needle in the past.  Anyone have
any advice?


Rob, KL7NA
Rob Frohne, Ph.D., P.E.
E.F. Cross School of Engineering
Walla Walla College
100 SW 4th Street
College Place, WA 99324
(509) 527-2075


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