|fly boy3||19/08/2018 15:36:05|
3440 forum posts
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 Parker||19/08/2018 16:05:10|
866 forum posts
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.
|Steven Shaw||19/08/2018 16:31:08|
278 forum posts
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.
337 forum posts
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!
|Peter Miller||19/08/2018 18:33:19|
9701 forum posts
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 Duncker||19/08/2018 21:43:43|
|69 forum posts|
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 Stainforth||20/08/2018 00:18:24|
|282 forum posts|
Gator RC (F3a Unlimited) have some excellent carbon fibre wing tubes and sleeves in a range of sizes.
|Piers Bowlan||20/08/2018 07:33:18|
1676 forum posts
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 Cooper||20/08/2018 07:48:08|
394 forum posts
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.
|Peter Miller||20/08/2018 08:22:27|
9701 forum posts
Actuall I meant Balsa Mart which is part of Blackburn Models
|SR 71||20/08/2018 08:55:08|
242 forum posts
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 boy3||21/08/2018 11:58:26|
3440 forum posts
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 Chaddock||21/08/2018 12:57:23|
5306 forum posts
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.
|Geoff Peacock||21/08/2018 16:53:56|
207 forum posts
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…
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