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

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glcasey

Joined: 01 Jul 2007
Posts: 23

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

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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Gary Casey

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