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Old Apr 30, 2001, 04:09 PM
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Hi David,
Thanks for the info. the wings I am building are for a sport plane like a Cap, Extra, etc. probably around 40", and sheeted with balsa. I have had planes before with foam wings and liked them, I just could not find the white foam thick enough, was looking for about 1 1/2" - 2" and all I could find is a 1" thickness. I'm not sure of the density of the pink foam, it is the typcal home builder stuff and feels much denser than the white 1lb stuff. I figured it would make a great slow flyer wing, but I was not sure how it would do sheeted and on a hotter model.

Thanks,
David
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Old Apr 30, 2001, 04:25 PM
Larry Dudeck is offline
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I have used the pink (Owens-Corning) foam used for insulating basement walls. I buy the 1.5" thick board.

I cut wings out of this for my first plane, a 56" WS foamie trainer.

With nothing but packing tape for strength, the wing held up without a problem for 17 crashes in 222 flights.

Glue two pieces together for fuses. I use Elmers glue on this foam. Epoxy will also work.
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Old Apr 30, 2001, 06:07 PM
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Hi David
I agree that white foam is fine for above 10% thick but below that use pink. Consider covering with brown paper. It takes a bit of practice. Here are a few tips. Source of supply - any paper bag makers. They have end of roll rolls for a couple of coins in the charity box! and single sheets of differing thicknesses. Cover the wing in 3 pieces with about 3/16 overlap.Cut the sheets to size before you start. First soak the paper in tepid water for 5 mins or so then sponge/squeegee off the surplus water and apply whitewood glue thinned to about 50-50 with water to both foam and paper with a brush. Apply very thoroughly to the edges. When in position smooth over with a dry cloth. With thinish wings it may pay to support in position with some weights whilst drying to prevent warping (or set in some washout at this point). I apply the top 1st with a generous wrap on to the under surface. Then the bottom allowing a 1/2" overlap all round. You can then spray or brush paint or use any of the plastic films.
I use 2 grades 2.1/2 thou and 5 thou thick. The thinner one is much easier to achieve a smooth finish.
This is quite quick and surprisingly strong particularly in torsion. Good luck - John.
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Old Apr 30, 2001, 08:50 PM
Sal C is offline
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Woodridge, Illinois
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I think the further north you live the thicker the foam becomes available. My Home Depot carries pink & white foam up to 2 1/2 inches thick. But then again winters suck around here...
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Old May 01, 2001, 12:16 AM
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Foam types

Looking for some recomendations on what type of foam to use for my wing cores. At my local hardware store ( HomeDepot ) I can only find the 1lb variations at 1" thick. The "pink" foam, feels denser but I can get it in the thicknesses I want. Have not seen what is referred to as "blue foam". Any thoughts on how to select a good foam type to use? And common places to get it.

Thanks,
David
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Old May 01, 2001, 12:33 AM
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Hi David,
The foam you choose will depend on what you're building. The 1lb white foam is really too weak in compression to be used for anything like a pylon racer (which would have a thin, highly loaded wing), but it would be ok for a slowfly model, and perhaps for a thicker wing which would be sheeted with balsa. If your wing will be thin (less than 10% thick), highly loaded or skinned with fiberglass, then the denser foams will be better. Pink foam is generally the same as blue foam, except there are sometimes differences in density. What's the density of the pink stuff you found? What are you building? You're probably going to be fine with the pink foam, for most any project.

-David
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Old May 04, 2001, 11:23 PM
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The pink foam has good strength and is even better with a light skin. However, the foam is manufactured in a manner that that leaves stresses in it that can give it a twist. It may have to be cut flat on one face before accurate hot wire cutting is started.
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Old May 04, 2001, 11:28 PM
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I get my blue foam at an Insulation Supply Company. Look in the yellow pages. The pink is pretty much the same as the blue.

Mike
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Old May 05, 2001, 07:27 PM
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Stavanger, Norway
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For a plane like you describe white foam will do nicely if you skin it with 1/32" balsa, both sides. Use a semi-symetrical airfoil and like 8-10% root thickness. Add 2% thickness to the tip cord as this will aid in stability (less prone to tipstall)

I use white foam frequently as thin as 6% with no problems so far.
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Old May 05, 2001, 11:15 PM
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Haldor, The white foam wings at 6% you're building, do they have spars in them? Are theses wings that you would use on a fan plane or fast hotliner? I'm wondering if they will stand up to a high G flight pattern without spars.
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Old May 05, 2001, 11:58 PM
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I bought some blue foam wings from Bob at Flying Foam for a sport plane that I'm building. His prices were very reasonable and he was very helpful with all my questions and e-mails. If you just need the foam, he may be able to hook you up or tell you his source.
http://www.flyingfoam.com/
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Old May 30, 2016, 11:40 AM
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For my rc and modeling friends, I have found a number of web sites, rc forums, and questionable videos, all pouting a description and info on different types of foam used in rc and related areas of the modeling industry. I do not myself have the experience or knowledge to expound answers myself. However. EUREKA!! I have found a website that has it all. What foams to use, how to identify them, where to use them best, how to finish them, what glues to use and not use for each, etc. I hope the site will put to rest any concerns. Keep building, flying, and have great fun doing it.
http://www.rcplanesguru.org/2015/10/...d-shaping.html
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