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Old November 2nd 05, 05:02 PM
John R. Copeland
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"Mark Hansen" wrote in message ...
On 11/2/2005 08:33, John R. Copeland wrote:

"Mark Hansen" wrote in message ...
On 11/1/2005 17:43, Bill Zaleski wrote:

I never said that you will get "green line "vacuum. I did say that
the gyro's will continue to work with the vacuum that you will have
with a windmilling engine. Go to 10K, windmill, and see that you still
have useable gyro's. Been there, done that, they still work.

How long did you windmill? After all, the gyros are going to
continue to spin for some time with no vacuum. The slower they go,
the more difficulty they're going to have.

Did you go for more than 5 or 10 minutes and verify that they were
still working acceptably?


My gyros spin up from stopped to a usable state while my engines idle after startup.
Don't yours?


What is usable? The AI usually doesn't straighten-up 100% until after
I do my static run-up.

However, the real sign is the vacuum gage. It reads below the green while
idling. Now, the gyros are still spinning even while the vacuum is not
in the green - but I wouldn't want to bet my life on them while in IMC
conditions ... I may have to, but I wouldn't assume they are working 100%
while the vacuum is below the green.


Roger that.
Do you have any possibility of changing to a higher-capacity vacuum pump?
(I assume your instrument filters aren't clogged, of course.)
I show 5 inches Hg of vacuum at engine idle in my airplane.