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Old Dec 06, 2004, 01:24 AM
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2 Mistakes Downwind
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Portland, OR
Joined Nov 2004
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Construction Materials - for those interested in such details...

The Magpie fuselage and wing are made from expanded polystyrene (EPS) foam. The tail feathers are Depron. There is also some thin plywood, and plastic strapping tape used for strengthening.

EPS Foam

Polystyrene is a polymer made from styrene, a liquid which is manufactured from petroleum oil (and also found in some plants). EPS is available in different densities, but is commonly about 95% air and 5% polystyrene. It's the same stuff foam coffee cups and most packaging are made of, and is often referred to as Styrofoam, the tradename under which it is marketed in the USA. EPS is quite brittle and rigid, but when covered it makes for a strong and lightweight structure.

Depron is also EPS, but in this case it stands for extruded polystyrene, which is very different from the expanded kind. In the modeling world, only expanded polystyrene is generally called EPS.

Extruded Polystyrene comes in many forms. In modeling you will hear of names such as BlueCor, Fan-fold foam (FFF), Foam-Core, Depron and others. Yet another type of foam often used in model planes is expanded polypropylene, or EPP. EPP is much more flexible and durable than EPS, and also more expensive and more difficult to cut and sand.

A close-up of the wing-tips showing the familiar "bead-board" - EPS foam.
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Last edited by ToyBoy; Dec 11, 2004 at 06:01 PM.
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