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Todd - my first engine mounting plate had the exhaust even closer. I bite the bullet and fabricated another one which moved the block forward 3/4", which also solved a water pump/fire wall clearance problem and the starter nose clearance too. I am getting pretty good at freehanding a router to machine the plates. I even have pockets up front routered out for weight savings, all done free hand (just go 1/16th" at a time, and keep your mouth closed! chips go everywhere).
Thanks for the info. I have some welding curtain material I use for protection which seems to work well. I wrapped my Lycoming starter in it since a cross over pipe comes close.
Kevin Lane Portland, OR
e-mail-> n3773@comcast.net
web-> http://home.comcast.net/~n3773
(browse w/ internet explorer)
----- Original Message ----- From: "Bartrim, Todd" <Steve.Bartrim@canfor.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, March 02, 2005 11:58 AM
Subject: [FlyRotary] Re: 20B exhaust (so far)
Hi Kevin;
My exhaust didn't work out exactly as I'd envisioned it and as a
result the pipe is almost touching 2 of my mount struts where it passes
between them. I was quite concerned about heat damaging the mount, so I
kept a very close eye on this area. However it really hasn't been an
issue. The paint on the mount hasn't discoloured at all so I haven't
been too concerned, however I still check it often. When I first
received the EM2, I attached one of my spare CHT thermocouples to the
mount to monitor it and while I can't recall the temp, I know it was low
enough that I stopped worrying about it. I should've logged it.
Todd
this is a good point and I admit to have not thought it through yet. I
have made two engine mount plates so far because the first one had the
exhaust almost touching the exhaust, maybe 1/8" clearance. I will have
to come up with some type of shield however. I hope, also, to introduce
some fresh air flow over them also.
Kevin Lane Portland, OR
I'm curious if you're planning some kind of heat shield for that mount
strut that runs between the exhaust pipes... or maybe several layers
of
exhaust tape... something to keep some of that heat away anyhow?
Looks
scary to me, especially when you consider that those exhaust tubes
will
likely be glowing red at full throttle. Just a thought.
<Marv>
Homepage: http://www.flyrotary.com/
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