Boeing 360 tandem rotorcraft, N36OBV hovering nose right over open field. The Boeing Model 360 was an experimental helicopter developed by Boeing to demonstrate new technology, including extensive use of composite materials in the rotorheads and fuselage, a retracting landing gear and internal fuel cells. Design features were carried over to other programs, such as the RAH-66 Commanche and the V-22 Osprey.