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MauleDriver(at)nc.rr.com
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 Posted: Sat Apr 24, 2010 1:17 pm Post subject: was 569JC- now vacuum pump behavior with windmilling engine |
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I realize that the 569JC discussion is over on VAF but I'd like to ask a
question I just realized I don't have a clue about...
If you lose your engine and the prop is windmilling, does your vacuum
pump still generate enough suck to power the gyros? Or does the
horizon just slowly fall over? (assuming you have vac powered gyros)
Thanks,
Bill
Bill Mauledriver Watson wrote:
| Quote: |
<MauleDriver(at)nc.rr.com>
Nick, really, really nice job piloting (period).
Sitting in the virtual cockpit with you, I'm imagining that it must be
nice not having to transition off a vacuum powered anything when you
lost power. And the situational awareness of the glass has to be sweet.
Would be curious to hear any thoughts of why there wasn't a fire.
Bill "fully awake this morning" Watson
40605
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Bob Turner
Joined: 03 Jan 2009
Posts: 885
Location: Castro Valley, CA
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| Posted: Sat Apr 24, 2010 1:40 pm Post subject: Re: was 569JC- now vacuum pump behavior with windmilling en |
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Depends....
but most vacuum pump installations generate enough flow to power the gyros even at idle (look at the vacuum pressure gauge, is it in the green?). so if the engine windmills at 1000 rpm or more, and usually it will (depends on the prop, if there's internal damage, etc), then yes, the gyros will work.
If this wasn't true, then a 172 making a long idle power descent thru the clouds might suddenly find the gyros didn't work!
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_________________
Bob Turner
RV-10 QB |
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MauleDriver(at)nc.rr.com
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| Posted: Sat Apr 24, 2010 3:06 pm Post subject: was 569JC- now vacuum pump behavior with windmilling engine |
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That all makes sense. Just couldn't think it through. Thanks!
Bob Turner wrote:
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Depends....
but most vacuum pump installations generate enough flow to power the gyros even at idle (look at the vacuum pressure gauge, is it in the green?). so if the engine windmills at 1000 rpm or more, and usually it will (depends on the prop, if there's internal damage, etc), then yes, the gyros will work.
If this wasn't true, then a 172 making a long idle power descent thru the clouds might suddenly find the gyros didn't work!
--------
Bob Turner
RV-10 QB
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=295576#295576
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