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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-866621@logan.com>
Subject: Re: [FlyRotary] Re: The Final? Story on the Engine problem
Date: Tue, 12 Apr 2005 16:23:57 -0400
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Mark,

I'll have to check further in better lightening conditions (and a magnifying
glass).  I will do that tomorrow - but, given that these apex seals are
somewhat brittle (the older ones not the new ones that Tracy sells - they
are incredibly tough), so don't think a    hairline crack would last long
before prorogating into a total failure.

Ed A
----- Original Message -----
From: "Mark R Steitle" <mark.steitle@austin.utexas.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, April 12, 2005 4:18 PM
Subject: [FlyRotary] Re: The Final? Story on the Engine problem


Ed,
Can you see any evidence at the fracture of a developing hairline crack,
or is it a fresh break?

Mark S.

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Tuesday, April 12, 2005 3:11 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: The Final? Story on the Engine problem


----- Original Message -----
From: "echristley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Tuesday, April 12, 2005 3:40 PM
Subject: [FlyRotary] Re: The Final? Story on the Engine problem


>
> >Photo  Apex Departing Slot clearly shows where the missing piece of
the
> apex
>
> >seal bent over the straight edge of its slot when it departed.
Apparently
>
> >when it left the clearance was getting less and the departing edge
was
>
> >apparently caught between the lip of the slot and the rotor housing
forming
>
> >a flatten corner.
>
> >
>
> Ed,
>
> How well does the position of the break line up with your exhaust
port?
Are
> there any tiny chips near the break that look like they may have been
around
> a while?
>
> I'm thinking of the possibility of a piece of debris chipping the seal
in
> the vicinity of where it flexes as it crosses over the exhaust hole.
Stress
> riser, being the unpredicable ^%&# they are, will always give out just
as
> you cross the limit of not being able to glide home.
>

A good point, Ernest, I'll have to go back out and check the pieces in
better light or better yet bring them in the house where i have a couple
of
magnifying glasses.

Ed


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