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Old Jul 24, 2007, 10:13 PM
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Why aren`t most foam planes made with EPP or equivalent.

Most of the foam planes are made with EPS or "beer cooler foam" EPP or equivalent like foam is so much more sturdy an reistant to dings and crashes.
Multiplex and Walkera use it. I dont have to glass it unlike EPS.
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Old Jul 24, 2007, 10:20 PM
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It's heavy and flexible.

Flying works better when the material is light and rigid.

There are manufacturing and cost issues, too, but forme the weight and rigidity are most important. I can glass it and end up stronger, stiffer, and still lighter and cheaper than EPP.
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Old Aug 31, 2015, 09:02 AM
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The biggest reason we don't see more EPP planes is that EPP doesn't work well in an injection molds for big production runs. It tends to get a heavy skin in the mold and stick to the mold.

Most of the EPP planes are wire cut one at a time making EPP an expensive material to work with. EPP is more flexible for its weight so it requires spars and structure reinforcing.

The advantages of EPP are significant. Try this with an EPO or EPS plane.

RC Plane Crashes into Brick Wall in Slow Motion. (7 min 31 sec)
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