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Hi! All
On the apex seal subject, being that Tracy's seals are one piece (main section) they will not have tendency to pivot out of the slot. As well the concave wear on the sides of the seal should be minimized. I'm just making a die to tighten up the "V" in the slot on my hydraulic press with a full base support, If it restores the parallelism of the slots & not just bend the tips over I will use the rotors with RWS seals. The last 13b I dismantled had a 2.43mm opening at the top of the slot & the seal was concave to the point that the center was less than half the original thickness (this engine had 168000KM). I'll keep you posted.
Georges Boucher (trying not to let business interfere with projects)
-------Original Message-------
Date: 04/25/05 04:47:49
Subject: [FlyRotary] Soft Seals Sloppy slots S^4
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 -----
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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