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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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 Posted: Tue Mar 06, 2007 6:43 am Post subject: Inspection Ring Covers |
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Does it matter how inspection ring/hole covers are oriented? That is, should the retaining clip be oriented lengthwise or crosswise to the direction of flight?
I have some flat ones and some convex ones. Is there a prefrence?
The inspection hole I have cut out is on the bottom of the fuselage under the elevator tube midship bearing.
Tom Jones, Classic 4, Ellensburg, WA
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d(at)cfisher.com
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| Posted: Tue Mar 06, 2007 7:10 am Post subject: Inspection Ring Covers |
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Tom,
My Belly cover has 4 tabs that hold it on.
It has never fallen off on floats , skis or wheels but after the King Fox
tire install and try - outs in water the water spray will knock it off. Only
happened twice so far but it can still happen.
Dave
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84KF
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| Posted: Tue Mar 06, 2007 7:13 am Post subject: Re: Inspection Ring Covers |
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Tom,
Hole covers include two types. 2 clips-normal, and 4 clips- highspeed\aerobatic. Use the 2, and it sounds like that's what you have.
I have never seen any published info that states orientation is an issue. I have opened up hundreds of fabric aircraft and they remain in place no matter which way they face. And yes, there are times when you must install them in a direction that avoids the internal structure such as spars and ribs.
Concave seems to conform to the reinforcing ring, plus you can apply pressure to the middle and edges to "pop" it open to get the clips over the edge of the hole when fabric thickness or obstructions make it a tight fit. once installed, carefully "pop" it back to original shape. This also avoids chewing up the fabric layers on the inside of the hole. Not always necessary to do such, but sometimes it helps.
Steve
A&P, IA
Dope and fabric since 1979 ( when Polyfiber was Stitts)
Never fly the "A" model of anything" (author unknown)
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Tue Mar 06, 2007 8:10 am Post subject: Inspection Ring Covers |
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The theory that I heard was orient the clip across the flow of air.
This way, if it slips back, it will still be held on by both clips,
whereas the other way it could slip back and the front of the clip
would miss the hole and the cover could be lifted in front by the air
and be flipped off the plane.
Lynn
On Mar 6, 2007, at 9:43 AM, Tom Jones wrote:
| Quote: |
Does it matter how inspection ring/hole covers are oriented? That
is, should the retaining clip be oriented lengthwise or crosswise
to the direction of flight?
I have some flat ones and some convex ones. Is there a prefrence?
The inspection hole I have cut out is on the bottom of the fuselage
under the elevator tube midship bearing.
Tom Jones, Classic 4, Ellensburg, WA
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=99041#99041
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Lynn
Kitfox IV-Jabiru 2200
N369LM |
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Float Flyr
Joined: 19 Jul 2006
Posts: 2704
Location: Campbellton, Newfoundland
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| Posted: Tue Mar 06, 2007 8:56 am Post subject: Inspection Ring Covers |
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Tom:
Did you first install a reinforcing ring on the skin or your plane before
cutting the hole? Sorry dumb question. The tabs in any orientation should
be enough to hold the plate on... I would expect that having the tabs
lengthways in line with the direction of flight may be a bit better. If you
have trouble with the plates moving then you can install tinnerman clip nuts
and use self tapping screws with them. Three screws to a plate attached at
120deg around the edge of the plate.
This is the system that most, if not all the inspection ports are attached
to a C185. Personally if I were to use that method of attachment like
Cpamsna I would pre drill the location of the tinnerman nuts and the plates.
Noel
[quote] --
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Noel Loveys
Kitfox III-A
Aerocet 1100 Floats |
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Tom Jones
Joined: 12 Mar 2006
Posts: 752
Location: Ellensburg, WA
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| Posted: Tue Mar 06, 2007 12:28 pm Post subject: Re: Inspection Ring Covers |
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Okay, thanks for the replies guys.
| Quote: | Did you first install a reinforcing ring on the skin or your plane before
cutting the hole? Sorry dumb question. |
No questions are dumb. Thanks for checking up on me. Yes, I installed the reinforcing ring using the "after the aircraft was finished method". I got tired of streatching to reach the elevator bearing to clean and lube it.
Tom Jones
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