that is most curious bob. my aircraft has a brackett foam airfilter
(replaced annually) on the air inlet and none on the carby heat. the
reasoning is that carby heat is only applied when well off the ground
and the risk of contamination is small.

the problem is not bugs imho the problem is grains of sand.

you sure the builder didnt rig it up backwards?
Stealth Pilot
+++++++++++++++++++++++

It is neither curious nor backwards.

The few RAM AIR designs I have encountered,
ALL do WITHOUT the filter for max ram effect - even the
certified Mooney. However, Mooney does have a mode
that employs a filter when RAM AIR MODE is not desired.
In effect, I do the equivalent with carb heat mode.

FWIW....
Loss through the filter appears to be unacceptable to those
engineers that care to max performance with RAM AIR designs.
Perhaps those more knowledgeable will add their 2 cents???

P.S.
The RAM AIR topic has been addressed here in the past.
I'm surprised you are not somewhat familiar with the topic.


Barnyard BOb --