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Wing joiners/tubes

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fly boy319/08/2018 15:36:05
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3254 forum posts
11 photos

Hi all, the current model for my Winter build requires wing joining rod and tubes. In 30 years of building I have not come across this system. It's a small model, 58inch w/s. The plan calls for 8g section. I have made enquires from club members, and have decided on the following. 3/16 dia. rod or piano wire, and K&S 7/32 brass tube. The 7/32 is the OD of tube. Can any one confirm this fit before I order same. Thanks

Robert Parker19/08/2018 16:05:10
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806 forum posts
1069 photos

Hi FB3,

I recently used phenolic tube which I got from SLEC available in several sizes comes in either 18" or 36" lengths ranging from 1/4" to 1 1/2" diameter. Look in the accessories section.

Regards

Robert

Steven Shaw19/08/2018 16:31:08
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237 forum posts
142 photos

K&S brass tubes are sized to slide into each other, so yes, the 7/32 tube slides nicely over the 3/16" tube or a 3/16 rod.

**LINK**

Trevor19/08/2018 16:32:37
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299 forum posts
40 photos

Unless it is a particularly wild or heavy model, a 1/16in ply ‘blade’ joiner fitting into a ply box built between the spars should be perfectly adequate on something that size, provided you’ve got at least 3/4” between the spars. Much lighter than hefty wire!

Trevor

Peter Miller19/08/2018 18:33:19
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9289 forum posts
1086 photos
10 articles

I have used 8 SWG [iano wire into 8 SWG brass tubes. Balsacraft normally stock the tube. Most places should stock the wire.

I have just been using 8 mm, 6mm bore Carbon Fibre tube and 6 mm carbon fibre rod on my MAK 15 MP design

THis is a bit lighter and works really well, Stockist of Perkins goods will be able to order it for you.

John Duncker19/08/2018 21:43:43
17 forum posts
7 photos

I would be using a carbon fiber tube rather than brass, wire or 1/16th ply.

More details needed before I could recommend a size

John Stainforth20/08/2018 00:18:24
210 forum posts
38 photos

Gator RC (F3a Unlimited) have some excellent carbon fibre wing tubes and sleeves in a range of sizes.

Piers Bowlan20/08/2018 07:33:18
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1382 forum posts
37 photos
Posted by Peter Miller on 19/08/2018 18:33:19:

I have used 8 SWG [iano wire into 8 SWG brass tubes. Balsacraft normally stock the tube. Most places should stock the wire.

I have just been using 8 mm, 6mm bore Carbon Fibre tube and 6 mm carbon fibre rod on my MAK 15 MP design

THis is a bit lighter and works really well, Stockist of Perkins goods will be able to order it for you.

I think Peter might mean Balsa Cabin, Balsacraft have long since gone (sadly). I like to use carbon fibre tube as a wing joiner running inside Aluminium or brass tubes (K & S), which are bonded to the spars. What diameter depends on the size of model but on a 58in span model 6 to 8mm dia. would be fine.

Edited By Piers Bowlan on 20/08/2018 07:36:24

Brian Cooper20/08/2018 07:48:08
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362 forum posts
17 photos

As it is only 58" span, if this was on my building bench I would make it a one piece wing. . It will make life a lot simpler.

B.C.

Peter Miller20/08/2018 08:22:27
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9289 forum posts
1086 photos
10 articles
Posted by Piers Bowlan on 20/08/2018 07:33:18:
Posted by Peter Miller on 19/08/2018 18:33:19:

I have used 8 SWG [iano wire into 8 SWG brass tubes. Balsacraft normally stock the tube. Most places should stock the wire.

I have just been using 8 mm, 6mm bore Carbon Fibre tube and 6 mm carbon fibre rod on my MAK 15 MP design

THis is a bit lighter and works really well, Stockist of Perkins goods will be able to order it for you.

I think Peter might mean Balsa Cabin, Balsacraft have long since gone (sadly). I like to use carbon fibre tube as a wing joiner running inside Aluminium or brass tubes (K & S), which are bonded to the spars. What diameter depends on the size of model but on a 58in span model 6 to 8mm dia. would be fine.

Edited By Piers Bowlan on 20/08/2018 07:36:24

Actuall I meant Balsa Mart which is part of Blackburn Models

**LINK**

SR 7120/08/2018 08:55:08
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204 forum posts
59 photos

I buy some Ali tube from my local diy in Cyprus and make my own outer tubes from fibre glass much cheaper especially with the postage to Cyprus

fly boy321/08/2018 11:58:26
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3254 forum posts
11 photos

Whoa lads, I am overwhelmed with great ideas. Should have asked the question before cutting our ribs etc. As I was not familiar with this type of wing joining, I blindly followed the drawing of piano wire and brass tube.!! Next time I will try these alternatives that are more to my liking. Thanks

Simon Chaddock21/08/2018 12:57:23
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5197 forum posts
2721 photos

fb3

Don't be surprised by the response.

Steel wire and brass are 'conventional' wing joiner methods for small models but I bet you won't find in any solid steel bar and brass tube as a load bearing structure in a full size plane!

As a combination they are structurally hopelessly inefficient and there are much lighter ways to achieve the same result. wink 2

Geoff Peacock21/08/2018 16:53:56
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192 forum posts
68 photos
Posted by Peter Miller on 20/08/2018 08:22:27:
Posted by Piers Bowlan on 20/08/2018 07:33:18:
Posted by Peter Miller on 19/08/2018 18:33:19:

I think Peter might mean Balsa Cabin, Balsacraft have long since gone (sadly). I like to use carbon fibre tube as a wing joiner running inside Aluminium or brass tubes (K & S), which are bonded to the spars. What diameter depends on the size of model but on a 58in span model 6 to 8mm dia. would be fine.

Edited By Piers Bowlan on 20/08/2018 07:36:24

Actuall I meant Balsa Mart which is part of Blackburn Models

**LINK**

As far as I know, according to their website, Balsa Mart (Blackburn Models) now only trades on-line, so those of us up here in t'Frozen North no longer have to make that long lonely trek over the Yorkshire border. Ah well, every cloud, etc…
yet sad that yet another LMS has gone. Nothing better than a long look round, a chat, then buying something you weren't expecting to get when you left home. Not the same, just typing on a keyboard.

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