Mailing List flyrotary@lancaironline.net Message #2482
From: Marvin Kaye <marv@lancaironline.net>
Subject: Re: [FlyRotary] Cooling fans
Date: Sun, 10 Aug 2003 19:42:02 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
"Tommy James" <twjames@healed.org>:
What do those with "Fan" experience say about preventing this kind of
problem?<<<

It's not fan experience, per se, but we use an interesting little circuit on the flap motors of our Lancairs to keep them from coasting when we shut off the current to move the flaps.  Put the power to the motor through a DPDT relay... the NO contacts are the +/- power in, the common contacts go to the motor.  You connect the NC contacts together so you short out the current coming from the motor-now-generator when the relay is de-energized.  The short across the motor works like a brake and keeps it (or stops it, in our case) from spinning.  I don't see why this same thinking couldn't be applied to a fan motor.  Just a thought.

          <Marv>
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