For all of you who want to dabble in to composite constructions here is a link that explains step by step how to make composite wings fuselages etc.
These techniques are valid for whatever you want to build and can be applied in different parts of the model. You might be watching a hollow wing mold building and realize the same technique can be used for a fuselage for example. You night be watching making a compression molded wing and realize it could be used in a landing gear door build or some other part.

https://www.youtube.com/channel/UCWaPcbCQVYwQQ-zrQ5jpv7A

  Resources
https://sweetcomposites.com/Kevlar.html  Kevlar for hinges etc
https://www.sollercomposites.com/ for by axial sleves some unidirectional stuff
https://thayercraft.com/ for inexpensive fiberglass in bulk
https://www.easycomposites.co.uk/#!/ for carbon fiber at a reasonable price specially unidirectional carbon 100g, my number one weapon for spar reinforcement of spar material. Also some spread tow carbon and plain weave carbon.
https://cn-models.com/catalog/carboweave good resource for skin material.
https://www.r-g.de/en/home.html  when all else fails these guise are more expensive but have good service. Here you can find the more rare elusive stuff not available elsewere.

Here's the guy,

There's always a guy, he spent a short time at this Forum displaying his composite CL, "look ma, no balsa" model, and, if I remember, he has a build someplace in the Forum or a website with great photos.

I'll try to find it.

I don't remember the Country where he's from, but we did exchange a few emails. Because balsa was expensive in his country he opted for another building medium, as he said. Balsa is growing in price.

As you can see, he has great accomplished building skills, plus, obviously, he adapted to a totally different building medium.

His material methods are the use of blue or pink construction foam covered with two layers of fiberglass cloth, If I remember? I had interest because, although this sounds complicated, it isn't, and this method has been around for quite some time.

I actually made the cowling and the fuselage firewall radius areas for my Gee Bee Z using pink foam. I dissolved the foam using lacquer thinner but this builder keeps his foam in tact.

If I did try this method, I would most probably contact this builder and construct his identical model. Great looking model!

You are thinking of Istvan Travnik.  No balsa.

 https://stunthanger.com/smf/building-techniques/the-bluefoam-model-or-how-to-build-a-stunt-plane-without-a-bit-of-balsa/

How can someone be from Hungry?  It is not anywhere on any map.

Keith

Hungary

Does he use epoxy - or perhaps some water based varnish with the glass cloth?

Glassed foam is a favorite building method with many R/C flyers.

Almost all of Istvans plane can be made using the NXT Sport wing build techniques. You can find that stuff in the first thread link. Obviously you have to modify the techniques used for the fuse or wing construction. A great choose for resin is the MGS brand you can find at Aircraft Spruce.

Noteworthy is that Istvan is using closed cell foam which doesn't collapse during banging. Thinning resin with alcohol is not a good practice because it can alter the resins proprieties. The resin should be applied to the cloth and not the foam to reduce weight.

Happy New Year!! Any new technics or material choses in the foam model area?

Best,   DennisT