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Wing joiner sleeves

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Old 01-27-2014, 08:48 AM
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edokarlb
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Default Wing joiner sleeves

I'm using 1" dia aluminum tubes to join removeable wings on a large WW-1 Junkers (my own design). Question is, do I need to provide fiberglass, or other material, sleeves in the wings? The ribs at the joiner area are lite ply and the holes will be close fitting to the tubes. The top and bottom spars and ply webs will completely box in the tubes. I guess I'm not sure what strength benefit some thin sleeves will have.
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Old 01-28-2014, 07:35 AM
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Yes you will need some sort of sleeve to accomplish this. TNT supplies wing tubes and sleeve of all sizes. Gator R/C used to as well, but I'm not sure if they are still around.
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Old 01-28-2014, 08:16 AM
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The sleeves are just a guide to aid assembly at the field. Without them it would be a major pain to get the wings on as you will have to find each hole in the ribs. TnT do have phenolic sleeves that work well or you can make some by wrapping some wetted out fiberglass around your wing tube that has been waxed.
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Old 01-28-2014, 05:26 PM
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edokarlb
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Thanks, pretty much what I thought. Guess I should redesign the rib holes to clear the addition of a sleeve.
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Old 01-28-2014, 07:19 PM
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Quote:
Originally Posted by edokarlb View Post
I'm using 1" dia aluminum tubes to join removeable wings on a large WW-1 Junkers (my own design). .
Karl.......what a coincidence that I stumbled onto this thread........I have been toying with the idea of a Junkers, too. Would like to hear more about your project and maybe some pictures, too.
Cheers,
Art
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Old 01-28-2014, 08:15 PM
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edokarlb
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Art,
I'm working on a Junkers J-1 with the upper wingspan of about 10'. Doing the design using CAD. It's a challenging project. Body is partially framed and am now starting to figure out the two wings. I'll see what I can send if you're interested.
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Old 01-29-2014, 02:08 PM
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I was considering the CL-1 (monoplane).......something for a second plane at an event that would be quicker to put together and take apart whenever bad weather came calling. I wouldn't have room for another biplane.

But its fun to watch someone else build - there's always something to learn......have you considered doing a build thread?
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Old 01-29-2014, 03:46 PM
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edokarlb
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Since it took me almost a year to get this far along, I don't think too many people will have the patience to follow it.
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Old 01-29-2014, 03:58 PM
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http://en.wikipedia.org/wiki/File:Junkers_JI.jpg
heres a link to the J-1. Not pretty, but interesting. I guess I like weird planes.
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Old 01-29-2014, 05:19 PM
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Quote:
Originally Posted by edokarlb View Post
http://en.wikipedia.org/wiki/File:Junkers_JI.jpg
heres a link to the J-1. Not pretty, but interesting. I guess I like weird planes.
I hear ya.......
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Old 02-06-2014, 09:04 AM
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Well, I decided to make up some fiber glass sleeves.
First, I polished the aluminum tube with a very fine sandpaper. I then coated it with a furniture wax.
Then I tightly wrapped the tube with 2 layers of waxed paper and held the end in place with a few pieces of scotch tape. The wax paper gives enough clearance to slide the finished sleeve on an off.
The wax paper was lightly coated with the resin before laying on the fiberglass cloth. I used 2 wraps of fiberglass.
I continued to apply resin to the cloth as it was wrapped on. Brush on enough to fill all the weaves. I also used an old credit card (or old hotel key card) to smooth and work in the resin.
Put the wet sleeve and tube aside in a warm place to cure. After a day I was able to work the sleeve off the tube. The wax paper was pushed out of the sleeve using a large diameter wood dowel. It feels strong and light.

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