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  #1  
Old 03-16-2021, 10:33 AM
avrojockey's Avatar
avrojockey avrojockey is offline
 
Join Date: Aug 2019
Location: Appleton, WI
Posts: 385
Default Oil Door Stiffening?

Builder had good intent with his clean design but the oil door wasn't good so I installed a hidden hinge and camloc. However the door flexes enough that around 140 KIAS the door pops open because the lock interference is lost.

I'm looking at stiffening the door with foam sandwich, but ACS is out of stock of foam cores and minimum size is 2' x 4'...I don't need that much.

Any thoughts on different stiffening technique or alternative material to foam? I was thinking about using end grain balsa as it has superior strength and rigidity to foam.
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  #2  
Old 03-16-2021, 10:39 AM
rocketman1988 rocketman1988 is offline
 
Join Date: Jun 2010
Location: Sunman, IN
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Default I used...

I used SORIC. It is about 1/8" thick and when properly wet, forms hexagons.

I put one layer on the door and covered it with one layer of cloth.

Planning to use it on the inside of my wingtips, as well...
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  #3  
Old 03-16-2021, 10:43 AM
PhatRV PhatRV is offline
 
Join Date: Mar 2018
Location: Buena Park, California
Posts: 518
Default

Since the oil door is small, you can do a thin float coat of epoxy and microballoons of about 1/8 to 1/4 thick and lay another ply of fiberglass over it. It should create a stiffer door and more heat resistant than foam.
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  #4  
Old 03-16-2021, 10:56 AM
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avrojockey avrojockey is offline
 
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Location: Appleton, WI
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Default

Quote:
Originally Posted by PhatRV View Post
Since the oil door is small, you can do a thin float coat of epoxy and microballoons of about 1/8 to 1/4 thick and lay another ply of fiberglass over it. It should create a stiffer door and more heat resistant than foam.
I'm guessing flox be stiffer/stronger? Should I use it? I have both...and silica. Of course, if using flox I might as well just layer up glass...the balloons would be lighter
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Last edited by avrojockey : 03-16-2021 at 11:00 AM.
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  #5  
Old 03-16-2021, 11:14 AM
alpinelakespilot2000 alpinelakespilot2000 is offline
 
Join Date: Jan 2005
Posts: 3,712
Default

I used short pieces of very thin angle aluminum--maybe left overs from elevator or rudder stiffeners--that I riveted onto the fiberglass door. Also, make sure you have enough of a lip on the opening to catch the latches firmly.
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  #6  
Old 03-16-2021, 11:23 AM
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Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 3,046
Default

You can get the foam from Vanís. They sell it for just this function.

Carl
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  #7  
Old 03-16-2021, 11:32 AM
PhatRV PhatRV is offline
 
Join Date: Mar 2018
Location: Buena Park, California
Posts: 518
Default

Quote:
Originally Posted by avrojockey View Post
I'm guessing flox be stiffer/stronger? Should I use it? I have both...and silica. Of course, if using flox I might as well just layer up glass...the balloons would be lighter
The required sheer strength isn't that great but the weight penalty using cotton flox is small for the size of the oil door. one thing, microbaloons is easier to sand and smooth than cotton flox.
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RV8 standard build: Empennage 99% completed
Wing -- Closed
Fuselage -- Canopy Done. Fiberglass 80%
Avionics Installation -- 90%
Firewall Forward -- Cowl completed. Baffle 90%
Electrical -- 90%

Donation paid through 2021
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  #8  
Old 03-16-2021, 11:58 AM
David Paule David Paule is offline
 
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Location: Boulder, CO
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Some people add carbon.

Dave
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  #9  
Old 03-16-2021, 12:21 PM
Bavafa Bavafa is offline
 
Join Date: Oct 2007
Location: Sacramento, CA
Posts: 3,566
Default

Vans has foam core for just this purpose. It is sized just large enough for the oil door and works great. Look it up on their store.
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  #10  
Old 03-16-2021, 12:43 PM
John Tierney John Tierney is offline
 
Join Date: Jan 2006
Location: Vonore, TN
Posts: 476
Default

You could try a mini-version of Darwin's "Tips for Tips" article, maybe glass in some short segments of drinking straws.
https://vansairforce.net/articles/Da...mentphotos.pdf
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