I have two suggestions :
1. In order to get clearance from walls and similar obstructions, the helicopter could be dropped from the end of a rod,say, about 2 meters long. A hook at the end of the rod could engage a hook or a loop on top of the helicopter. The helicopter could be dropped by turning (rolling) the rod 180 degrees.
2. The rules refer to aerodynamic drag on the helicopter "blade. " A single blade cannot make a helicopter. A minimum of two are required. All the blades in a plane are together called a "rotor." Therefore, the term "blade" should be replaced by "rotor(s)."
B Division Coach 2012 : Shock Value (Gold at NC State) & Bottle Rocket (Silver at NC State)