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Yes, It could be carb ice....right conditions , high humidity @ about 60
Deg F...
An early Continental engine is very suseptable to icing...
However the vibrations may not be connected to icing...:
prop
balance
cracked Crankshaft
Cracked prop hub ( taper
shaft engine)
Bad engine
mount
Hard engine mount
rubbers
engine missing (mag
check)
Sticking valves
Water in fuel - gascolater
screen missing
I suspect the engine loss of power was Icing. If applying full carb heat
cured it after a short period, that would signify icing..
For the first time in my 50 years of experience, this past year was the
first time I ever experienced icing at cruise........gradual loss or rpm.....at
cruise...BUT, conditions were right...high humidity, about 60 degs F, and
constant engine speed.... Full carb heat fixed it.
Tho, It occurred several times a the altitude I was flying.....yet when I
flew higher altitude, it went away. Seems I was just right at the proper
altitude/moisture level to form clouds/ice in the carb.
Fly Safe - Have Fun
Harry Francis
Elliston, VA.
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