Building R/C models from foam is a bit different from balsa
Wings are made by cutting through the foam by means of a hot wire. Fuselage
is often a combination of foam and wood or carbon spruces
1982: Foam model of F16. Powered by 1.5cc engine.
Looks nice in the air.
Hard landing: foam has it's weaknesses.
1984: Big foam delta cut from Roofmate (blue foam) 3.5cc, very fast. Learned
the hard way that delta's can behave tricky in sharp turns.
2004: 1.4m twin -boom electro-glider build from carbon tube/rods and Depron.
One-piece model. Plans are available here.
I used a special construction: The wing main carbon spar is used for
transferring the aileron movement.
Powered by small brushless motor and 9.6V/500mAh Li-Ion cells. Fuselage from
triplex and carbon rods.
Fuselage covering: 2 PET soda bottles, heated to make them shrink around a
0.5mm steel wire goes via one of the booms to elevator control. The whole
models weighs around 400grams!
Easy launching and great soaring.
2006: Motorized version of foam delta Pibros. Basic plans available
2008: Improved (bigger) motorized Pibros model. Motor: Align RCM400L, 11.2V
The engine is placed toward the middle for better CG without adding lead
1m wingspan, total weight: 500 grams. Great flying, can climb vertically.