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Radiator Flaps

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lcfitt(at)sbcglobal.net
Guest

Posted: Sat Jun 03, 2006 10:15 am Post subject: Radiator Flaps

The discussion last winter about heaters and coolant temperatures resulted 

in my installing radiator flaps on my Model IV.  I flew this morning for an 

hour and tried the flaps out in flight.  I have the Skystar provided 

Speedster radiator shroud.



First of all, I can't keep them closed in flight.  Air pressure forces them 

open - a nice feature for the dreaded failure mode.  I definitely have time 

to figure out a fix on this one.



Secondly there is a definite pitch down effect when I close the flaps and I 

will lose about 2 mph, 107 down to 105 mph at constant RPMs with them 

closed.  Interesting.



For you guys with heating problems, this might suggest some sort of 

engineered housing for the radiator.  It is hard to believe effectively 

closing air flow through the shroud would have that effect.



Lowell

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