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Repairing pocket hinges

Old 10-11-2008, 07:13 AM
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RustyTumbles
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Default Repairing pocket hinges

G'day guys,

I'm after some advice on how to go about repairing slop in the Wild Hare pocket hinges. My 35% Sukhoi is starting to develope some slop in the rudder and LH elevator hinges. I believe it to be caused by wear on the carbon rod as the hinges already had bushes installed from the factory, but I won't know for sure until I pull the surfaces fron the hinges.

Just wondering if anyone else has repaired them and if so what did you use to do the job?

Cheers

Rusty
Old 10-11-2008, 12:13 PM
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Default RE: Repairing pocket hinges

Just replace the CF rods, that ought to do it.

TF
Old 10-11-2008, 01:41 PM
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Default RE: Repairing pocket hinges

If you have the bushings already installed you can obtain brass tubes from McMaster-Carr that don't wear out. You'll get to spend some time looking but the addy is www.mcmaster.com. That was not a link btw.
Old 10-11-2008, 03:52 PM
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Default RE: Repairing pocket hinges

Tom.
Dp up stock the CF rods you mentioned above or can you point us to a source. Mine on my 2 year old Sukhoi are a little loose in the rudder. Normal wear I suspect but would be nice to be able to replace the rods if needed.
Thanks.
Old 10-11-2008, 10:03 PM
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Default RE: Repairing pocket hinges

I don't have enough in stock to do a plane. I can order some to ship in my next container, it would be here about Christmas time. Would that help?

TF
Old 10-12-2008, 10:09 PM
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Default RE: Repairing pocket hinges

I checked mine this afternoon and only the Rudder hinge is a little loose. I suppose it would be nice to have a source but sure wouldn't want you to order a bunch of rods if only one or two of us will need them. On the other hand if lots of the new planes are going to be pocket hinged with the same marterial I suppose it someone will need one or two down the line.
Old 10-12-2008, 10:19 PM
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Default RE: Repairing pocket hinges

Actually I found some at McMaster Carr that looks about the right size. It's about $20 for a 4 foot piece.

What you want is .0156" OD CF tube. Conatct me if you want me to get some for you.

TF
Old 10-15-2008, 03:34 AM
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Default RE: Repairing pocket hinges

Hey tom,

Do all the surfaces have the bushes in the hinges. I can see the elevators or ailerons are bushed without pulling the control surface off. I know the rudder is from the build.
Old 10-15-2008, 07:55 AM
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Default RE: Repairing pocket hinges

Yes we use bushings in everything.
Old 10-23-2008, 11:15 AM
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Default RE: Repairing pocket hinges

Hi.
I´m in the process of building a suk. and I think I´m going to fuelproof all the slots and add a small amount of grease to all of the hingepoints.
I think this will reduce the wear to a minimum.

Ps.
I think it would be wise to check the cf rods on all surfaces from time to time. If a cf rod breaks it would be hard to get the remaining piece of the rod out, a worn rod is easy to replace.

Lars.
Old 11-04-2008, 07:10 PM
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Default RE: Repairing pocket hinges

Tom,

I spoke to the guys a DA yesterday and the comp-arf hinge pins are 4mm also, so I've ordered a set off them.

The rudder pin was worn pretty badly, but the bushes are ok. Except the top on which has come loose, should be able to glue it back in without to much trouble.

What is the best way to get the elevator hinge pins out? There isn't any of the rod hanging out like on the rudder.

Cheers

Rusty
Old 11-04-2008, 09:42 PM
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Default RE: Repairing pocket hinges

You should be able to cut away the covering over the area where it would come out very easily. If it doesn't pull out easily you may need to cut around the tube with a piece of sharpened brass tubing with an ID just larger than the tobe, then it should come out pretty easily.

TF
Old 11-04-2008, 10:20 PM
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Default RE: Repairing pocket hinges

Ok i'll give that a try.

Cheers

Rusty
Old 01-07-2009, 03:19 AM
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Default RE: Repairing pocket hinges

Seems like this is a part of the plane that wears quickly. I also tried the C-ARF pins but there is still slop in the left elevator which means the brass bushes are too big for the CF tube/pin.

Has anyone tried bearings in the two end points?
Old 08-02-2010, 03:55 PM
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Default RE: Repairing pocket hinges

Just pull the rods out and flip them over and re-insert. This will give you twice the life from one set of rods.

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