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jconnell(at)rconnect.com
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 Posted: Mon Mar 06, 2006 3:29 pm Post subject: Trimming Engine Baffles to fit top cowling |
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Fellow Builders,
I've finally gotten the RV-9A/O-320 baffle parts trimmed to match the top
cowling and establish the baffle-to-cowling spacing. Trimming was easier
than I feared it would be.
I made a one inch diameter "washer" or "wheel" out of aluminum and drilled a
small hole in the center. (A one inch washer will give you a half inch separation
between the cowl and baffle -- a 3/4 inch washer will give you a 3/8 inch
separation.) None of the baffle parts should be riveted together except angle
brackets that attach to the ramp floors.
I set the top cowling on top of the engine and it rested on the baffle parts. (The
two forward bulkhead parts were left off as was the bottom cowling.) Put the
"wheel" over the tip of a Sharpie marker. Lay the wheel against the rear baffle
and push it up until it makes contact with the top cowling. Roll the wheel against
the cowling while the pen transfers the shape of the cowl onto the baffle. The
back cowling parts can be reached through the engine mount area. Do the same
with the side baffles. You may need to cut the sharpie pen if it is too long to work
with. I didn't have to although I have pretty big paws.
Remove the top cowl and trim all the baffle parts where they have been marked.
(You may need a vixen file to match file the adjacent baffle pieces.) I went
through this routine about 4-5 times before the top cowl would fit properly.
Once the top cowl settles into place and the hinges are secured, run the wheel
one more time. The final pass will mark the final cowl-to-baffle spacing depending
on what size washer you made. Install the two front bulkhead pieces. Use the
same technique as above to mark, trim and re-fit. I was able to work through the
inlets.
I'm sure other builders have other ideas...
Joe Connell
Stewartville, MN
RV-9A N95JJ
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Jerry Grimmonpre'
Joined: 09 Jan 2006
Posts: 144
Location: Huntley, Illinois 60142
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| Posted: Tue Mar 07, 2006 4:19 pm Post subject: Trimming Engine Baffles to fit top cowling |
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Joe ...
Thanks for sharing your method with the list. I learned alot from your
description.
Jerry Grimmonpre'
RV8A Electrical
Do Not Archive
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bhester(at)hopkinsville.n
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