In article ,
(noah) wrote:


I've been used to flying with the rpm around the bottom of the
green arc for this kind of thing, as my CFI used to always remind me
that "Carb-Heat introduces unfiltered air [into the carb]" which is a
bad thing...

Basically - is it bad for the aircraft (C172) to float around at
around 85kts with the power somewhere below the green arc (say
1800rpm) and the Carb-Heat on? Ok, there is a second benefit - my club
charges based on tach time, and I have to be honest about that -
although I really do wish for the tours to be slower.

Just because you're RPM is below the green arc doesn't mean you'll
develop carb ice. In fact with a carb air temp gauge you might find
that at high power settings you're colder than at low power settings.

Try it without the carb heat. If you notice any roughness or RPM drop
apply heat.

The O-470 in a 182 makes more ice than most Frigidaires. I never flew
with the carb heat on constantly and I never had any carb ice problems.
I also had a carb air temp gauge.

--
Dale L. Falk

There is nothing - absolutely nothing - half so much worth doing
as simply messing around with airplanes.

http://home.gci.net/~sncdfalk/flying.html