Scott,
There are standby vacuum systems on production aircraft that use the vacuum
generated in the engine intake manifold. One disadvantage is the power
reduction and leaned mixture when this standby system is selected for use.
This system will operate a vertical gyro and a gyro compass with about 4 inches
of vacuum under 5,000 feet MSL.
Sid Wood KR2, N6242
Mechanicsville, MD
-----
Netters,
I'm looking for a cleaner way of mounting a 4 in
vacuum venturi. It appears that Steve Jones' setup is
effective, as far as providing ample vacuum, but I
think there's gotta be a cleaner way to do this.
Has anyone placed the venturi inside the cowl and
provided an inlet and exhaust for it?
Inside the cowl would provide several advantages:
1.) Less drag
2.) Less prone to icing
3.) Ram air from prop would provide vacuum signal
sooner?
Could a vacuum pan set-up provide enough vacuum to run
vacuum powered instruments? A Smog check valve is
placed perpendicular to the exhaust flow, with the
check valve opening facing downstream. This provides
enough vacuum to evacuate the crankcase of fumes,
enough power to run instruments?
If both of these systems were plumbed, would it have
enough redundancy to use with out electrical
instrument back-up?
What are other KR's that flying (or close to it)using?
=====
Scott Cable
KR-2S # 735
Wright City, MO
[email protected]
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