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Controlling defrost fans

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recapen(at)earthlink.net
Guest

Posted: Thu Jan 17, 2008 6:39 am Post subject: Controlling defrost fans

I have a pair of 1.5"x1.5" fans (Radio Shack 273-240) mounted forward of the instrument panel on my 6A slider - think about the intersection of the support bulkhead parallel and forward of the instrument panel and the ribs that point aft that support the top of the instrument panel in three places.



I am wondering if a straight on-off switch is sufficient or should I put in a rheostat to control the fan speed?  KISS would dictate that a simple on-off switch would work - but has anyone out there wished for a half-speed?



Here on the DelMarVa peninsula - I'm certain that I'll need it on a regular basis



Thanks,

Ralph

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frank.hinde(at)hp.com
Guest

Posted: Thu Jan 17, 2008 7:20 am Post subject: Controlling defrost fans

I doubt it...Just give it full blast to de-mist then shut them off...Once your flying I doubt you'll ever turn 'em back on.



I wish I had installed a fan now too on my tip up in Western oregon



Frank



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JimT

Joined: 27 Feb 2006
Posts: 22
Location: Auburn, ME

Posted: Thu Jan 17, 2008 7:56 am Post subject: Controlling defrost fans

I just put a 5 ohm resistor across a SPDT switch to give a  high-off-low option.

 Works great in the garage, but not flying yet.

 

 Jim Timoney

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