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Laminated wing tips

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fly boy308/10/2018 19:54:29
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3770 forum posts
22 photos

My current build asks for laminated wing tips. 1/16x1/4 inch. Also a small part of rudder

and horizontal tail

tips. Do I need to build balsa formers , steam individual parts then pin to former ,wait to dry then go on to the next one ? It seems to me a long way of doing this when I can cut said parts from solid balsa. Thanks ps cannot find any thing on utube re this subject

Denis Watkins08/10/2018 20:18:58
4649 forum posts
131 photos

FB, laminating strips imparts huge strength increases on relatively small sections

And obviously, you can easily form and bend thin strips

A laminate of your 1/16 sheet is more than double the strength of one 1/8 sheet by 1/4

It is a slower process than chucking sheet in, but laminating produces very strong correctly shaped members.

The only short cut would be band sawing 1/8 or 3/16 ply radii, for the tips

But is hugely wasteful

Former Member08/10/2018 20:25:57
1322 forum posts

[This posting has been removed]

john stones 108/10/2018 20:30:15
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11688 forum posts
1517 photos

I love doing laminates, there is no one way, sometimes you can just pin and form them, other times you'll need a template, stronger n lighter. yes

Former Member08/10/2018 20:31:11
1322 forum posts

[This posting has been removed]

fly boy308/10/2018 20:46:27
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3770 forum posts
22 photos

Thanks both. So it's all about strength. Now I can see why the designer has done this and he s right too lol. Tite bond it is then. Lanzo record breaker now you are talking. Awesome model Cheers. Ps great pictures

Peter Miller08/10/2018 21:13:07
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11474 forum posts
1365 photos
10 articles

I like to to add a lamination of 1/64"ply. usually the innermost lamination

Bert08/10/2018 21:47:42
521 forum posts
10 photos

If it’s any help I use correx plastic sheet for formers, It’s cheap, especially if you can recycle estate agents signs.

Bert

fly boy308/10/2018 22:23:11
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3770 forum posts
22 photos

Thanks all for your input. Will give it a try, Im in no race lol. I also like to build true to plan if I can and I love a challenge. Thanks

Former Member08/10/2018 22:28:23
1322 forum posts

[This posting has been removed]

john stones 108/10/2018 22:41:33
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11688 forum posts
1517 photos

I like adding inside the ribs, makes a strong job.

John Stainforth09/10/2018 04:30:43
373 forum posts
64 photos

Laminated wingtips are vastly superior to those cut from sheet. They are quite easy to do. No steaming required, just wet strips of 1/16th sheet one at a time and glue them to the rest with aliphatic resin. Of course, you need some kind of shape jig. The strength to weight ratio of laminated wingtips is astounding.

Martyn K09/10/2018 09:16:39
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5098 forum posts
3693 photos

On my indoor or lightweight models I add a lamination of 0.006" unidirectional carbon, the next to inner lamination. I use cardboard templates edge wrapped with cling film as suggested above.

I tend to soak in luke warm water for about 30 minutes then draw the wood through my fingers to squeeze out excess water, I use PVA as an adhesive - lots of it but as its damp it just tend to run away (epoxy o the carbon layer). You need to pull the laminations very tight. I use pins in balsa blocks to hold the laminations in. When dry - usually within 12 hours in a shed environment, I then run a few drops of cyano into the seams before I remove the laminate assembly. This hardens the wood quite nicely

Former Member09/10/2018 09:37:27
1322 forum posts

[This posting has been removed]

fly boy309/10/2018 10:03:23
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3770 forum posts
22 photos

Could be a silly question, but when I make a template do I use the inner or outer radius of wing tip ? Cheers

Nigel R09/10/2018 10:23:54
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4159 forum posts
698 photos

fb, inner radius

fly boy309/10/2018 10:26:14
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3770 forum posts
22 photos

Thanks Nigel, that makes sense. Cheers

john stones 109/10/2018 10:37:59
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11688 forum posts
1517 photos
Posted by David Mellor on 09/10/2018 09:37:27:
Posted by john stones 1 on 08/10/2018 22:41:33:

I like adding inside the ribs, makes a strong job.

John, that sounds interesting - how do you do that?

Fit cut inner laminates once the ribs are fitted, and fit in between ribs.

Stuphedd09/10/2018 12:15:31
722 forum posts
376 photos

I too like laminated "stuff", Just finished a Great Lakes where all the curved flying bits were laminated instead of the sheet stuff supplied

I use obeche, the stuff you used to cover foam wings with , and like most people "above " I wet them , bend them round a multipin "template and let them dry , then alifatic then all together , I use alifatic as its a lot easier to sand than PVA,

The results are usually bullet proof , I also use the same principle to make skiis for my winter planes !!

Mowerman09/10/2018 12:34:47
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1561 forum posts
105 photos

Formers for laminating can be from - depron, hardboard, balsa(scrap bits), cardboard, or just lots of pins. Clingfilm between formers and laminations to stop the balsa strips sticking to the former.

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