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How to easily bend and curve foamboard - Making scratch built or FliteTest RC planes.
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- เผยแพร่เมื่อ 14 ส.ค. 2024
- Here in the U.K. our foamboard is heavier, harder to peel and a pain to curve without it creasing. Here's a quick and reliable method for making curves without creases.
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Really cool way, Man! 😃
Wondering why you don't use a damp sponge to get the paper slightly moist if you want to peel it off? Seems to work pretty well if you let the paper dry out a bit before trying to peel it off. If you get the paper too wet, it might be difficult to peel it off in one go and may have to use your fingers, or a tool to roll the paper off in batches. If you want a more consistent curve in the foam board, all you need is around 1/2 inch thick foam rubber, or a bit bigger than the foam board piece you want to "roll" and a smooth piece of pipe (I use PVC pipe). Place the foam board part on the foam rubber bed/pad, and roll your PVC, or other type of smooth pipe over it gently at first, and apply a bit more pressure with as many passes as needed to gain the curve you want. If you want to curve the foam board part a lot, use thicker foam rubber pad.
I use to have a TH-cam video up about how to do this on a foam pad bed, lots of space to use, and was cold rolling foam board of various types as thick as 6 mm, or as thin as 2mm, as in stiff foam dinner plates where I had trimmed away the raised edges for a flat piece. The idea was to make super lightweight skins for various small RC and larger aircraft fuselages. The goal was to learn how to avoid any wrinkles in the foam, or not cause the brittle foams to crack. With a bit of practice, starting out gentle at first and increasing the pressure on the rolling tube a little each time, easy to do. I also used the PVC pipe to roll off the paper if desired by first starting to peel the paper until I had enough for the pipe to hold it. Once I had enough to wrap around the pipe, it was simple to roll the pipe slow enough to gently pull the paper loose.
The secret is in the foam rubber keeping the foam board part pushed against the PVC roller, so no need to pre score the foam with a knife and you get a very smooth, wrinkle, crease, and crack free foam board part with as much curve as you like.
Genius
We have the exact same foamboard here in Australia (you can get depron which is basically the same stuff but without the paper), and i agree, its is just crap to use
Foam board is rigid or soft?
How should cut it so good?
Yes, idk about foamboard in the US but it must be different from what we have because UK ‘foamboard’ is utter crap. The paper covering is very bad, susceptible to water damage, makes it harder to glue, harder to cut, and impossible to bend. It’s not really made for this application.
The best thing to use would be styrofoam/XPS foam as it’s called, because it doesn’t have any ‘wrapping’, it’s flexible, light and cheap. Also a breeze to cut and available in many thicknesses. Gets a little rigid above 1cm though. Lightly heating for forming might work around that. Glues excellently with UHU Por glue (the other types just melt it lol).
Nice technique though, good workaround that :)
Foam board using outdoor work?
Nah, the crappy paper covering will get wet and ruin the project. Use foam without any covering. Styrofoam and EVA are maybe best for RC (haven’t tried it yet but built a few architectural models with blue styrofoam and was happy with it)