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Good point, Dale. Now that you mention it, it may have been not so much the bending motion but the fact the apex seal could not easily slide back down in its slot subjecting it to the pressure of the decreasing space between rotor and housing and - Pow!. If that indeed were the cause then perhaps its not so much the "V" slot wear (which was within the limits that Bruce T has set) but the soft seal. I think that would make people feel better. Also whether it was the bending or being stuck on the metal ridge formed, it would seem that the stronger, harder seals of Tracy's would minimize either possibility. We will see.
Lynn indicated he has never seen a worn bout apex seal slot - but apparently the racers use the very light (and strong) ceramic seals and LOTS of premix oil which would likely wear the slot less. Apparently the racers also use air filters {:>)
Yes, I agree about being careful in design of the induction system. My induction system has no bolts, nuts, screws, etc anywhere internal to the system. The only thing I can think of inside the runners would be the plastic diffusers for the injectors (all still present and accounted for) and the clumps of epoxy shaping the secondary intake into the engine. I shaped the epoxy so that (hopefully) should it detach from the walls it would still be retained and not go into the port. So far its still seems to be secure.
Well, its gotten warm enough to get back out to the work shop and finish assembling the engine. This (photo) is where I left it last night.
Ed
----- Original Message ----- From: "Dale Rogers" <dale.r@cox.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Sunday, April 24, 2005 11:12 AM
Subject: [FlyRotary] Re: loose parts (was: Chuck Dunlap )
Well, I did say it was a *minor* nit.
Chuck's experience does point out, though, that we need to
analyze every ramification of every mod we make to the
factory system.
There have probably been hundreds of thousands of six-ports
that have run their lives out without ever having a problem
with that pin working loose. Well, Mr. Murphy says that if
it can come loose - it will. Every piece of the induction
system needs to be looked at with that in mind - where will
this go if it comes loose. Not that I'm saying you didn't
do that, Ed - I'm just making a general observation.
In fact, a message from you earlier this morning makes me
wonder if you haven't finally found the culprit. As the
seal wears, it develops a step on the side. What happens
when it wears enough for the step to climb atop the edge
of the groove?
Regards, (__
Dale R. |----==(__)==----|
COZY MkIV-R13B #1254 o/ \o
Ch's 4, 5, 16 & 23 in progress
From: "Ed Anderson" <eanderson@carolina.rr.com>
Date: 2005/04/24 Sun AM 09:05:30 EDT
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Chuck Dunlap (was: All Parts have arrived,
Whew!)
Right, Dale, it was a pin rather than a bolt (my mistake) - my point was
that his apex seal failure we know was caused by a Foreign object rather
than perhaps a "V" slot failure.
Ed
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