The "Minimum" uses
three 2" x 24" AeroBalsa RotorBlade Airfoils, cut down to make a rotor diameter of 37". Weight is about 18 ounces. It's powered by a Plettenberg Freestyle 24 with an APC 9x4.7 prop and a 3s/910mAh lipo battery. No rudder or elevator, just pitch, roll, and throttle.