About EPP Foam - EPP (Expanded Polypropylene) foam is a fairly recent innovation and is rapidly finding applications to the mainstream R/C community. Slope combat enthusiasts are making scale warbirds out of this material for full contact combat. These planes are flown in 30+ mph ridge lift and are designed to ram into each other at high speed and crash to the ground with no damage. EPP foam doesn't dent or break. It has a "spongy" quality to it, so on impact it compresses and pops back to shape. You can nose dive an EPP plane straight into the ground during "rough landings" only to have it bounce about 3 feet in the air and come to rest upside down. The only damage will be some grass stains on the tape covering. Having this kind of crash resistance is truly liberating.
On test flying the Sky Soldier radio controlled plane we found it so easy to fly it's ridiculous! Made of EPP foam the Sky Soldier is ultra flexible and its wings can touch each other without snapping making it able to withstand more impact than any other electric flight plane in the industry.
