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Engines-List Digest: 14 Msgs - 10/12/07

 
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glcasey



Joined: 01 Jul 2007
Posts: 23

PostPosted: Sat Oct 13, 2007 4:37 am    Post subject: Engines-List Digest: 14 Msgs - 10/12/07 Reply with quote

I've heard this before, but consider this: The piston rings run at
no load half the time regardless of manifold pressure (BMEP). During
the exhaust and intake strokes the pressure is very low, so if the
rings were going to flutter why don't they do it then?
Gary

Quote:

Time: 06:37:28 AM PST US
From: "Fergus Kyle" <VE3LVO(at)rac.ca>
Subject: Ring flutter?
Piston Ring flutter:
`....seems to me we had the same problem on the Super Connie (Old
Bob may comment here). This aircraft was named the largest 3-engined
airliner on the Atlantic. So. on pain of death no Driver, Airframe,
would
ever reduce the Brake Mean Effective Pressure (BMEP) below 90 with
the RPM
at cruise or descent because the condition would induce 'ring
flutter' and
an earlier engine change was inevitable.
I suspect my employer's profit was based more on engine changes than
seat mileage.
Cheers, Ferg


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