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Mauledriver(at)nc.rr.com
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 Posted: Mon Jan 21, 2013 9:17 am Post subject: Oil door deformation in flight - a sealing option |
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I lost track of the thread where this discussion was taking place but I
said that I'd post a pic of some silicone strips I used somewhat
successfully to reduce the oil door deformation in flight.
https://www.dropbox.com/s/t459zmd5b3g1pue/Oil%20Door%203.jpg
You can see I used the hidden hinge and the two latches on the front and
rear edges of the door. I used a piece of foam overlayed with some
light wt glass cloth to stiffen the door. I later glommed some graphite
strands on top to absolutely no effect. Please ignore those.
In flight, the door would bow outward along 3 of the 4 edges. Notably
it did not bow out on the hinge edge since there is a stack of aluminum
strips underneath hinge attach point.
I've since added the 3 strips of silicone you see in the pic. It's the
same silicone I used for the engine baffling. They are bonded with
high temp silicone which is just about the only thing that will bond to
that stuff. These significantly reduced the bowing, especially along
the left edge where the strip is continuous. Leakage around the latches
appears to still allow some bowing along the front and rear edges. Not
sure how to address that at this point.
In the end, I'd like to fabricate a new, much stiffer door. A
sandwiched carbon fiber piece should do the trick. I like the hinge.
I'm not in love with the latches but not sure what I would use in their
place. Camlocs might be good but would require a tool to operate.
FYI, I had inserted some small strips of stainless steel into the
cowling as catches for the latches. For those of you worried about the
door opening in flight, they flew open on me twice when one of the steel
catches unbonded itself. The door opened but was securely retained by
the hinge only. It turns out you can fly at moderate cruise speeds with
the door hanging open. It didn't even appear to be under much stress.
Bill "The Texas State Society of Washington DC throws a helluva party"
Watson
N215TG
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toaster73(at)embarqmail.c
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| Posted: Mon Jan 21, 2013 11:42 am Post subject: Oil door deformation in flight - a sealing option |
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I do not have a picture handy... my door has the same hidden hinge and two
flush latches on the left side of the door next to each other; one forward
and one aft. But I did use 2 layers (maybe more can't remember) of carbon
tow on the outside surface. I have no added sealing features. The door is
VERY stiff and I do not notice any position change in flight.
I do notice the aft edge of my cowl balloons up a bit, about 1/16 inch in
flight. This is just due to the slack in the aft hinge pins toward the
center of the cowl.
-Chris
N919AR
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Ron B.
Joined: 17 Feb 2009
Posts: 103
Location: Nova Scotia
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| Posted: Mon Jan 21, 2013 12:55 pm Post subject: Re: Oil door deformation in flight - a sealing option |
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The only thing about flying with the door open is loss of cooling. My original opened twice in flight and it just sat there with no movement. I landed right away. The alum. cover I made now stays put.
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