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cgbrt(at)mondenet.com
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 Posted: Wed Jan 23, 2008 9:26 am Post subject: Rudder hinge repair |
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After 12 years and 500 hrs rudder hinges on my 701 showed wear and play. At this year's annual I made the following repair to the hinge parts on the rudder.
Top Hinge: Used model a/c brass tubing 3/16 ID and 7/32 OD to make bushings. Drilled the hinge to 13/64 then to 7/32 and press fiited bushings.
Bottom hinge: Purchase bronze bushing 5/16 OD 3/16 ID ($1.50 at GBS). Drilled hinge to 5/16 and press fitted bushing.
Total cost less than $5. including left-over tubing for 10 repairs and one spare bushing. Attached two Photos. Sorry about focus.
Carl
701/amphibs/912
[img]cid:000c01c85de4$429a6340$0100007f(at)carl[/img][img]cid:000d01c85de4$429f1e30$0100007f(at)carl[/img]
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victorbravo(at)sbcglobal.
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| Posted: Wed Jan 23, 2008 10:19 am Post subject: Rudder hinge repair |
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EXCELLENT job, but I have a couple of questions due to my own inexperience:
Were you still able to maintain enough "edge distance" from the enlarged
hole to the edge of the aluminum? Perhaps one of your preflight items
should be to look at the hinges to make sure cracks are not developing.
(I'm sure Heintz was conservative in the design, but there is an awfully
big rudder held on the airplane with two hinges that are awfully close
together. Three hinges means you can lose one and still have the rudder
stay on the airplane. Two hinges means you cannot lose one. And remember
you do not have a traditional vertical fin.)
Also, aluminum expands more than brass I think... when it gets warm how
are you going to make sure the brass bushings do not get loose?
(Have you thought about machining a groove in the lower part of the
bushing and putting in an E-clip or Circlip, more commonly known as a
Jesus clip, to retain it?)
Bill the New Guy
Carl wrote:
| Quote: | After 12 years and 500 hrs rudder hinges on my 701 showed wear and
play. At this year's annual I made the following repair to the hinge
parts on the rudder.
Top Hinge: Used model a/c brass tubing 3/16 ID and 7/32 OD to make
bushings. Drilled the hinge to 13/64 then to 7/32 and press fiited
bushings.
Bottom hinge: Purchase bronze bushing 5/16 OD 3/16 ID ($1.50 at GBS).
Drilled hinge to 5/16 and press fitted bushing.
Total cost less than $5.
|
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