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Posted for "Jerry Grimmonpre" <jerry@mc.net>:
Gary ...
Obviously you are on to something and the backup vac AI is what I would like
for my glass cockpit. The vac pump has demonstrated it's unreliability. It
would be nice to have a reliable source of vac to drive only one instrument
... the AI. Since I am not using a turbo charged engine there is a need for
another vac source that has no periodic cost, no moving parts, reliable and
not sticking out into the wind.
Is there a way to use the 4" venturi to dirve one AI and not have it sticking
out into the slipstream as with the early venturis? The 4" is $50 at Aircraft
Spruce P/N 15050. Just a thought for those with experience with venturis.
Can venturis be made to work in an tunnel of high velocity air?
Regards ...
Jerry Grimmonpre
I'm thinking that at least some turbocharged engine users would like to use
non-electric (vacuum) gyros as a backup for their fancy glass panels. I
have a design (patented, in fact) that allows a turbocharged engine to
supply the required differential pressure to vacuum instruments under all
operating conditions without the necessity of a vacuum pump. This could
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