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Date: Mon, 26 Jan 2009 11:05:00 -0500
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Message-ID: <1b4b137c0901260805x49f5dc68j8f8eaee6cdd91025@mail.gmail.com>
Subject: Re: [FlyRotary] Re: Frying pan... it gets fun!!!
From: Tracy Crook <tracy@rotaryaviation.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Hmmmm.  That does bring one more detail to mind.  The 3rd gen improvements
I'm aware of are in the area around the spark plugs to enhance heat transfer
to the coolant.  This raised the threshold of film boiling temperature.
Film boiling would result in hairline cracks radiating fore and aft from the
spark plug holes on the inside of the rotor housings.  This can also be a
source of coolant leaks into the chamber.   Look carefully, they can be hard
to see.

I've seen them (not on my engines) but it was my understanding that this was
a symptom of fairly long term repetitive overheating rather than a one time
event.  I could be wrong about that.

Tracy


On Mon, Jan 26, 2009 at 10:07 AM, John Slade <sladerj@sbcglobal.net> wrote:

> >IMHO, 225 deg even for a moment could very well be the culprit. I don't
> think we're comparing apples here. My understanding is that the 3rd gen
> engine is slightly beefed up in this area and can take higher temps without
> damage than the older versions. I could be wrong....
> John
>
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

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Hmmmm.&nbsp; That does bring one more detail to mind.&nbsp; The 3rd gen imp=
rovements I&#39;m aware of are in the area around the spark plugs to enhanc=
e heat transfer to the coolant.&nbsp; This raised the threshold of film boi=
ling temperature.&nbsp;&nbsp; Film boiling would result in hairline cracks =
radiating fore and aft from the spark plug holes on the inside of the rotor=
 housings.&nbsp; This can also be a source of coolant leaks into the chambe=
r.&nbsp;&nbsp; Look carefully, they can be hard to see.<br>
<br>I&#39;ve seen them (not on my engines) but it was my understanding that=
 this was a symptom of fairly long term repetitive overheating rather than =
a one time event.&nbsp; I could be wrong about that.<br><br>Tracy<br><br><b=
r>
<div class=3D"gmail_quote">On Mon, Jan 26, 2009 at 10:07 AM, John Slade <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:sladerj@sbcglobal.net">sladerj@sbcglob=
al.net</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"=
border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; paddi=
ng-left: 1ex;">
&gt;IMHO, 225 deg even for a moment could very well be the culprit. I don&#=
39;t think we&#39;re comparing apples here. My understanding is that the 3r=
d gen engine is slightly beefed up in this area and can take higher temps w=
ithout damage than the older versions. I could be wrong....<br>

John<br><font color=3D"#888888">
<br>
--<br>
Homepage: &nbsp;<a href=3D"http://www.flyrotary.com/" target=3D"_blank">htt=
p://www.flyrotary.com/</a><br>
Archive and UnSub: &nbsp; <a href=3D"http://mail.lancaironline.net:81/lists=
/flyrotary/List.html" target=3D"_blank">http://mail.lancaironline.net:81/li=
sts/flyrotary/List.html</a><br>
</font></blockquote></div><br>

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