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Hot Contactor

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Speedy11(at)aol.com
Guest

Posted: Sun Jul 25, 2010 6:55 pm Post subject: Hot Contactor

Bob,

 For a starter contactor mounted on the engine firewall, can I anticipate  any problems if the hot air from the oil cooler (180-200 deg F) is directed onto  the contactor?

 Thanks,

 Stan Sutterfield

  [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Jul 25, 2010 7:15 pm Post subject: Hot Contactor

At 09:53 PM 7/25/2010, you wrote:

  	  Quote: 	
		   Bob,

 For a starter contactor mounted on the engine firewall, can I anticipate any problems if the hot air from the oil cooler (180-200 deg F) is directed onto the contactor?

 Thanks,

 Stan Sutterfield 	


    No, the starter contactor is not generally used during flight

    and it's internal temperatures will be no hotter than the

    ambient.



    Battery contators are continuous duty devices and have significant

    temperature rise above ambient. Since service life is influenced by

    temperature, it's always good to minimize exposure to high

    ambients. But as a general rule, the el-cheapo contactors we've

    been using for decades seem to perform well under the cowl.



    Actual in-flight temperatures may not be as hot as you think.

    Just for grins, it would be cool to measure and document the

    highest observed temperatures on selected components under the

    cowl during a fly-off. You need to record OAT and local ambient

    too for any single measurement.



    I think the results will surprise you.



    Bob . . .    [quote][b]

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