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dlm46007(at)cox.net
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 Posted: Sun Nov 18, 2007 6:41 pm Post subject: cowl |
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Just finished fitting the cowl; fits like a glove. Here are a couple of tips.
the 1001N-L and -R should match the knuckles on the firewall and cowl exactly per plan picture. Otherwise it is necessary to remove a portion of the knuckles after the 1001Ns are riveted on. Then the center secured pin arrangment will work.
the hinge pins on the bottom cowl hinges should be left longer and secure with a clip at the center of the lower cowl attach bracket. Otherwise it wil be dificult to remove the cowl pins until the exhaust cools.
the side hinge pins should be left long and bent around the forward end of the cowl inlet and secured there (as in the Glastar). Otherwise the pin will lack enough length to grab it and remove it..
drilling the side hinges can be accomplihed by Clecoing the forward center together and clampling the sides together off the aircraft. This method was used to drill the side hinges for the top cowl.
[quote][b]
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Tim Olson
Joined: 25 Jan 2007
Posts: 2881
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| Posted: Sun Nov 18, 2007 7:02 pm Post subject: cowl |
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Good tips. The one thing that would be good to inject here again
for people since it's been a long time, is that I've heard about
quite a few instances of the bottom hinges the ones next to
the exhaust for the lower cowl, breaking eyelits on the hinges
over time. One builder I know saw them brake at a pretty fast
rate, in fact. Then, they switch to a screw and nutplate
arrangement for a better lifespan. All I can think is that there's
more vibration and the lower hinges hold more of the weight
of the hanging cowl, but I do know that they've been the common
place that breaks. So, if you're on the fence about doing
nutplates and screws, use that info to your advantage. If you
want to try the hinge method on bottom, no big deal, and you can
always change those over later if you find they don't hold up.
If they do, then that's great too. As long as you monitor
them, you shouldn't really have a huge concern as there's plenty
of other hinge to hold the cowl on. I was kind of intimidated by
the hinge pin method of the cowl securing in general, but so far
I've found that even pulling the top cowl isn't a big deal
a tall, so I'm more impressed after 300+ hours than I thought I'd
be.
Tim Olson - RV-10 N104CD - Flying
do not archive
David McNeill wrote:
| Quote: | Just finished fitting the cowl; fits like a glove. Here are a couple of
tips.
the 1001N-L and -R should match the knuckles on the firewall and cowl
exactly per plan picture. Otherwise it is necessary to remove a portion
of the knuckles after the 1001Ns are riveted on. Then the center secured
pin arrangment will work.
the hinge pins on the bottom cowl hinges should be left longer and
secure with a clip at the center of the lower cowl attach bracket.
Otherwise it wil be dificult to remove the cowl pins until the exhaust
cools.
the side hinge pins should be left long and bent around the forward end
of the cowl inlet and secured there (as in the Glastar). Otherwise the
pin will lack enough length to grab it and remove it..
drilling the side hinges can be accomplihed by Clecoing the forward
center together and clampling the sides together off the aircraft. This
method was used to drill the side hinges for the top cowl.
*
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VHMUM(at)bigpond.com
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| Posted: Sun Nov 18, 2007 7:14 pm Post subject: cowl |
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Most builders out here put a plate with platenuts there as it is well
documented with all RV's that the hinges may break. Simple fix now to save
dramas later.
Chris
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wvu(at)ameritel.net
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| Posted: Sun Nov 18, 2007 8:46 pm Post subject: cowl |
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That person would be me. My bottom left hinge eyelets (there're about 6 of
them) would break one at a time, on the cowl side. I replaced the hinge on
that side and kept an eye on it to see how long it would take for the first
eyelet to break. It was something like two hours. So then I installed
nutplates in the exact locations where the rivets were holding the hinge in
place. Just on the left bottom. Six nutplates were probably excessive but I
didn't want to drill new holes in the cowl. The right hand side was fine
through all this. That is before the left side was replaced with nutplates.
So then the right side eyelets started to break. I eventually replaced the
right side with nutplates also. Have not had issues since.
Anh
N591VU
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Dave(at)AirCraftersLLC.co
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| Posted: Mon Nov 19, 2007 7:36 am Post subject: cowl |
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One of my lower hinges broke after about 25 hours. I scratched my head for
awhile but now I'm pretty sure it was because I let the pin back out and
contact the exhaust pipe. I think the vibration from the pipe is what did
in the hinge. FWIW I'm using steel pins.
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