Repairing pocket hinges
#1
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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
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
#3
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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.
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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
TF
#6
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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.
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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
What you want is .0156" OD CF tube. Conatct me if you want me to get some for you.
TF
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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.
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.
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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.
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.
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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
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
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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
TF
#14
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?
Has anyone tried bearings in the two end points?