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  #1  
Old 08-28-2013, 10:47 AM
Berchmans Berchmans is offline
 
Join Date: Nov 2009
Location: Anchorage, Alaska
Posts: 465
Default Oil Hatch bulging in flight

I made the first flight of my RV-8 the other day and noted that the hinge side of the oil door bulges out slightly due to air pressure. I have used the hidden hinge and the standard vans latch fittings without the wing nut ears. Is there a good way to stiffen the door? I have thought about adding a small piece of channel to the underside of the door or possibly installing a couple more of the push and turn fasteners at the hinge corners.
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  #2  
Old 08-28-2013, 11:22 AM
flyinga flyinga is offline
 
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Default

I elected to live with it.
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  #3  
Old 08-28-2013, 11:43 AM
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akarmy akarmy is offline
 
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Location: Auburn, WA
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Quote:
Originally Posted by Berchmans View Post
Is there a good way to stiffen the door? I have thought about adding a small piece of channel to the underside of the door or possibly installing a couple more of the push and turn fasteners at the hinge corners.
Here's how I did mine. Seemed to keep the shape in line just fine.

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  #4  
Old 08-28-2013, 01:08 PM
jpharrell jpharrell is offline
 
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Location: Mission Viejo, CA
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Default Here is how I did mine

Another approach is fiberglass over foam core. Not flying yet but seems very stiff.

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Last edited by jpharrell : 08-28-2013 at 01:10 PM.
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  #5  
Old 08-28-2013, 02:21 PM
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Bob Ellis Bob Ellis is offline
 
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Location: Pembrokeshire, UK
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I think we're all saying the same thing - it needs beefing up - I wonder if this might not be best made out of stiff aluminium sheet?
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  #6  
Old 08-28-2013, 02:30 PM
Ron B. Ron B. is offline
 
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I replaced mine with .050 alum.. Never bulged or popped open since. It was time consuming getting the compound curve correct.
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  #7  
Old 08-28-2013, 02:47 PM
Bavafa Bavafa is offline
 
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I have a hidden latch which is based on a simple piece of hinge (left over from seat rail) and operated by a pull/push piece of wire from the air inlet. It keeps it from going anywhere and a cleaner look (my opinion)
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  #8  
Old 08-28-2013, 02:59 PM
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bruceh bruceh is offline
 
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I carefully cut out the oil door recess and saved the piece of pink fiberglass. I bonded it with epoxy under the oil door and it is very stiff now.


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  #9  
Old 08-29-2013, 07:44 AM
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chrispratt chrispratt is offline
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What Bruce said. It may be too late now, but for anyone still building, use the piece of fiberglass you cut out from the cowl and then fiberglass that to the underside of the door. Works great as a stiffener.

Chris
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  #10  
Old 08-29-2013, 09:20 AM
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tkatc tkatc is offline
 
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Part numbers for hidden hinge and latch mechanism?
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