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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-913581@logan.com>
Subject: Soft Seals Sloppy slots  S^4
Date: Mon, 25 Apr 2005 07:47:00 -0400
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Right, John

This past Saturday was two weeks from the incident, mainly waiting for 
parts.  I tore down and rebuilt the engine over 3 days, but actually time 
was probably around 10 hours.   Total cost was closer to $2500 what with 
both new rotor, housings gaskets, seals, etc.  However, I believe a complete 
rebuild of a Lycoming with all new cylinders and pistons, etc, would have 
run a bit more {:>)  Not infrequently a  catastrophic failure of a Lycoming 
means replacement of the crank and even the case, if a rod let go.  So all 
things considered I'm sure glad I fly behind a rotor.

The more I think about my incident and having talked to two other folks who 
used the Hurley seals and later took their engine apart, that what may have 
been the dominant factors were soft seals and sloppy apex slots.  My friend 
in Az just took apart one of this two engines that he had flow with (not 
related to a apex seal problem), he reported that he was surprised at how 
worn his Hurley seals were.  Very similar to mind with a considerable amount 
of material removed the length of the seal where it rubbed against the edge 
of the slot.  I think Rusty also reported the same.
A second person who had his engine apart due to an oil leak reported the 
seals from Tracy Crook/Bruce T looked like new.

If the seals were soft either by design for failure in the manufacturing 
process, then the wear and lost of material in a critical area of the seal 
combined with side forces due to the worn slot were probably not  a 
combination  due for long life.

Going out this AM to install the engine in the aircraft, hopefully will have 
it ready to by tomorrow.

Best Regards

Ed A


----- Original Message ----- 
From: "John Slade" <sladerj@bellsouth.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, April 24, 2005 11:35 PM
Subject: [FlyRotary] Re: EWP Installation Update


>> Well, Bob, I did finish the engine rebuild tonight and loaded it
>> in the Van.
> What's that, Ed - 2 weeks waiting, maybe 4 days work, and about $1500 in
> parts?
> This whole story makes a very interesting comparison to the Lycoming 
> powered
> Cozy that recently threw an exhaust valve at 6000' over Long Island. He
> barely made it into Farmingdale where it is now parked behind an FBO while
> the owner figures out how to either come up with $15k .... or....???
>
> John (new wood floor all done....next?)
>
>
>
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