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Laminations

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fly boy328/12/2018 20:21:31
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3421 forum posts
17 photos

Hi all, my current build asks for laminated wing tips. The wing chord is 11 inches. Having built a former, I have tried one lamination 1/4 x 1/16 X 18 inches. soaked in warm water for one hour. Fitted this to former with pins and rubber bands with no problems.This is a first in 30 years of building and flying.lol. Thanks to the info given to me by forum members I am hopeing this will be a success and I can progress with cutting balsa for the other laminations. How long until I can remove the lamination ? Cheers

Don Fry28/12/2018 20:40:34
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3144 forum posts
38 photos

The ancient way was warm water, or cold ammonia, to soak the laminates. All soaked, glued together, in one glueing session. Now there used to be a two pack, called cascamite?, and it was clamped until set, boat building. But in our case, aliphatic will do, but quarter inch of laminates will need 24, better 48 hours to dry at say 16° C.

One laminate won't hold its shape.

fly boy328/12/2018 20:47:17
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3421 forum posts
17 photos

Cheers Don, the one laminate was a test piece to see if the balsa would actually bend as much after soaking. Seems to be working. Thanks

Don Fry28/12/2018 21:01:57
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3144 forum posts
38 photos

OK, the one you've done is not wasted. Wet it again, and it's the first laminate it the block. It's astonishing what balsa will bend round. If you persist with water, a splash of meths is good.

Peter Miller28/12/2018 21:07:48
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9664 forum posts
1143 photos
10 articles

If you are bending round pins an inner laminaton of 1/64 ply is a very good idea, it stops the little kink at each pin location. If using a complete former it adds strength but is not so essental

Dave Hess28/12/2018 21:10:15
300 forum posts
18 photos

It's a lot quicker to hold your 1/16 strips over the spout of a boiling kettle. The wood goes bendy in seconds. Gue with PVA and pin in place. You can unpin it as soon as the PVA is dry, which will be a couple of hours in a warm place or overnight in a shed.

Don Fry28/12/2018 21:13:22
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3144 forum posts
38 photos

While you sort the scalds out young man. I refer you to the ancient joke, "the young bull said to the old bull, on spotting a heard of heifers"

Erfolg28/12/2018 22:07:58
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11211 forum posts
1103 photos

If you have a electric boiling water type wall paper stripper, that is a very good source of wet heat.

fly boy328/12/2018 23:13:57
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3421 forum posts
17 photos

Thanks lads, all tips are greatly appreciated. Cheers

Simon Chaddock29/12/2018 00:17:18
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5289 forum posts
2779 photos

If time is not a constraint use thinner strips!

I would bet 1/32 would bend easy enough without any softening but you would obviously need twice as many!

If you want to get really clever use hard(ish) wood for the inner and outer laminations and softer in between. Just as stiff and saves a bit of weight..wink 2

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