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Since I'm sending so
darn many pics anyways, I figured I'd send some of my air filter and ram air
scoop. The scoop is 8" x 3/4" = 6 sq". The filter is a 4"x10" K&N. It seals
tightly to the top cowl half, directly below the scoop. I hadn't thought to take
a better picture, but the alternate air inlet is on the end (labelled on pic).
It is simply a weak spring loaded poppet valve that opens a 1.5" dia hole. If
filter ices up, this should give me enough air to produce enough power to
maintain alt.
Jim, You hit on the one REAL likely failure mode for a filtered inlet,
ICE! All FI certified aircraft are required to have an alternate air source
for this reason. All the other possible problems mentioned are somewhat
remote. Icing an air filter is a very real possibility. 2 sources is
best.
Bill Jepson
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