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Flexing wings
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- Posts: 38
- Joined: 05 Sep 2017, 13:11
- Location: COLERAINE Northern Ireland
Flexing wings
Recently I was given this scale Capstan that was scratched built by a good friend of mine about 20 years ago
Today I flew it off our only westerly facing slope
I was amazed that it flew straight out of my hands but I soon noticed that the wings were starting to flap like a seagull
The main wing joiner is a 15mm steel bar and brass box
How do I stop the wing flexing so much
Thanks
Andrew
Today I flew it off our only westerly facing slope
I was amazed that it flew straight out of my hands but I soon noticed that the wings were starting to flap like a seagull
The main wing joiner is a 15mm steel bar and brass box
How do I stop the wing flexing so much
Thanks
Andrew
Re: Flexing wings
More info needed Andy.
Span and weight of model. Spar dimension? How much flex? ( a couple of inches each way?)
Brian.
Span and weight of model. Spar dimension? How much flex? ( a couple of inches each way?)
Brian.
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- Posts: 138
- Joined: 20 Mar 2015, 18:26
- Location: Cornwall
Re: Flexing wings
Andy, I'm not sure if you are implying the wings are flexing or are actually loose and moving on the joiner?
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- Posts: 38
- Joined: 05 Sep 2017, 13:11
- Location: COLERAINE Northern Ireland
Re: Flexing wings
I've had a good look at the model this morning and I think the wing joiners not heavy enough for the size of the model, it's 4.2m foam wing unsure of nature of the main spar, the model weighs approximately 15lb and the wing joiner is 15mm x 2mm steel bar inside a brass box
I'm thinking of doubling up the steel bar or possibly a tube of some sort
I'm thinking of doubling up the steel bar or possibly a tube of some sort
- Peter Balcombe
- Posts: 1399
- Joined: 18 Mar 2015, 10:13
- Location: Clevedon, North Somerset, U.K.
Re: Flexing wings
Andy,
I’m sure someone else will comment, but I have an idea that this model is supposed to have a double joiner & the 15mm strip system sounds the correct size for a design of that vintage.
I have rigged a 1/4 scale Capstan in the past & I seem to think it had a double joiner, but can’t remember for sure.
Cliff Evan will have access to a drawing, so maybe he can help.
I’m sure someone else will comment, but I have an idea that this model is supposed to have a double joiner & the 15mm strip system sounds the correct size for a design of that vintage.
I have rigged a 1/4 scale Capstan in the past & I seem to think it had a double joiner, but can’t remember for sure.
Cliff Evan will have access to a drawing, so maybe he can help.
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- Posts: 38
- Joined: 05 Sep 2017, 13:11
- Location: COLERAINE Northern Ireland
Re: Flexing wings
Good man Peter thanks
- Peter Balcombe
- Posts: 1399
- Joined: 18 Mar 2015, 10:13
- Location: Clevedon, North Somerset, U.K.
Re: Flexing wings
I will see if I can get a peep at the wing joiner arrangement on the one near me tomorrow evening.
- chris williams
- Posts: 1574
- Joined: 10 Mar 2015, 10:50
- Location: Blandford Dorset
Re: Flexing wings
A single 15mm joiner works well enough at 13 AUW. My Bergfalke 4's wings do flex when viewed from the air, but look normal enough from the ground.
15lbs might be pushing though...(Motley put two joiners in his version)
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15lbs might be pushing though...(Motley put two joiners in his version)
[youtube][/youtube]
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- Posts: 577
- Joined: 30 May 2015, 20:35
- Location: Sutton Bank, North Yorkshire
Re: Flexing wings
I agree with Chris; my 13.5lb PT ASW20 loops and rolls on a single 15mm strip joiner, although I think the plan called for 2. For scale flight, I think it should be fine, providing....the wing panels are locked very firmly against the wing roots, so that flight loads result in pure up and down bending. Any fore-aft flexing hugely increases the risk of twisting and buckling - the mode of failure for a strip on its edge.
My fave attachment method is Multiplex winglocks, although I often use a 3mm tie-wrap between two cuphooks. It has a tiny bit of give and I hope would fail in a serious arrival (tho' not tested yet).
Rog
My fave attachment method is Multiplex winglocks, although I often use a 3mm tie-wrap between two cuphooks. It has a tiny bit of give and I hope would fail in a serious arrival (tho' not tested yet).
Rog
Re: Flexing wings
I put two in mine too.chris williams wrote: ↑28 May 2019, 21:44 A single 15mm joiner works well enough at 13 AUW. My Bergfalke 4's wings do flex when viewed from the air, but look normal enough from the ground.
15lbs might be pushing though...(Motley put two joiners in his version)
BC