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At 11:57 PM 5/24/2006, Ralph Finch wrote:
but it never shows carb ice in the dry Spring, Summer, and Fall climates here.
Never say "Never"...
;)
A friend of mine pulled the carb heat on a Cessna 140 during his
runup and the engine promptly quit. Later that day he found about
2000 June bugs in the intake tract. Seems they were "nesting" in the
carb heat muff.
I am a firm believer in all or none as far as carb heat goes. You
may only get one shot at deicing the carb, so take your best shot, as
it were. Also, I cannot think of a situation where any carb heat or
partial throttle would be appropriate for takeoff. At full throttle
you have the minimum pressure drop through the carb, hence minimum
temperature drop, and minimum surface area for the ice to accumulate
on. If you need carb heat under these circumstances, maybe you
should rethink the whole mission....
One more thing: Pulling carb heat is the exception to the rule of
"if you don't like the result, undo the last thing you did." If you
have carb ice, when you pull the carb heat it is going to get [a lot]
worse before it gets better. Ice enriches the mixture. Carb heat
further enriches the mixture and feeds the engine a slug of water to
boot. Grit your teeth and hang on...
John Cooper, A&P
Skyport Services
PO Box 249
4996 Delaware Tnpk
Rensselaerville, NY 12147
518 797-3064
Fax 518 797-3865
www.skyportservices.net
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