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Control Surface Hinges

 
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JRatcli256(at)AOL.COM
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PostPosted: Wed Jul 11, 2007 2:02 pm    Post subject: Control Surface Hinges Reply with quote
Hi again,

Time to permanently install my hinges.

Have read on other lists about bedding the hinges in Epoxy when riveting them on.

This makes since to me because you are installing a flat surface to a rounded surface. By bedding the hinge in Epoxy, the stress is spread out over the whole hinge leaf rather then concentrated at the rivet holes.

I'm sure this is overkill ( many kolbs are flying successfully without this, for many years) but still makes since to me.

My questions are these: Has anyone else done this?
How about inservice results?
What kind of Epoxy did you use? Considering using J-B Weld, but discovered it is for steel.
Would it be appropriate next to aluminum?
Would it rust over time or cause galvanic corrosion?
Since the steel fillings are embedded in an Epoxy matrix, would it be an issue at all?

All thoughts would be appreciated.

John Ratcliffe


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John Hauck



Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)
PostPosted: Wed Jul 11, 2007 2:52 pm    Post subject: Control Surface Hinges Reply with quote
| Have read on other lists about bedding the hinges in Epoxy when
riveting them
| on.
|
| John Ratcliffe
John R:

As far as I know, there are no problems with piano hinges departing
round tubes on Kolbs.

Bedding hinges in epoxy is unnecessary, and will cause a serious
problem if you ever have to remove a hinge.

I have hinges on my mkIII, installed per the plans and instructions,
with well over 2,600 hours flight time on them. Have not had any
hinge problems concerning looseness.

Curious. Were the other lists you have been reading, reference epoxy
bedding of piano hinges, Kolb related/

Take care,

john h
mkIII

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_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama
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planecrazzzy
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PostPosted: Wed Jul 11, 2007 3:34 pm    Post subject: Re: Control Surface Hinges Reply with quote
Never heard of that one.....

You could probly round the hinge tabs slightly to conform to the tubing...

But that sounds like a waste of time too....

One thing alot of the guys change about the hinge area......

Don't "crimp" them.....drill holes & use cotter pins...

That way you can take it back apart if you need to...
.
.
.
Gotta Fly...
Mike & "Jaz" in MN
.
.
.
http://www.geocities.com/planecrazzzy/LSVI.html
.
.
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JRatcli256(at)aol.com
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PostPosted: Thu Jul 12, 2007 7:06 pm    Post subject: Control Surface Hinges Reply with quote
John H,

Picked info on hinges from the Challenger list. Info was related to loosening Hinges and rivets on some Challenger builds. One gent said he bedded his hinges in epoxy on all his builds and never had one come loose.
Only thing related to Kolbs is my desire to build as safe an aircraft as possible. Have never heard of this problem on a Kolb, although I have seen one or two loose hinge rivets on Kolbs for whatever reason.

Today I installed one of the hinges on an elevator. After seeing how tight they pulled up to the spar, now don't think epoxy is necessary. With the edge distance specified, there isn't much edge hanging out.

Mike,

Took your advice and drilled the hinges, but used safety wire instead. Looked like the head of a cotter pin could jam ???

Thanks all for the input.
Coming along slower then had hoped, but may be in the air before the end of the year yet.

John Ratcliffe

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