The MH-1 was originally provided as a series of kits to upgrade old Mini-500
airframes, allowing the owner to modify them to MH-1 standards. The kits include a new
Yamaha engine of , that replaces the Mini-500's
Rotax 582, plus a new mount for the Yamaha engine. The remaining kits cover modifications to the main transmission, the tail, main drive and clutch basket, radiator fans and relay and the rotor head. The aircraft can also be built new from a complete kit. In either case the resulting MH-1 complies with the US
experimental - amateur-built rules. The MH-1 features a single main rotor with a two-bladed tail rotor, a single-seat enclosed cockpit with a windshield and skid-type
landing gear. Its diameter two-bladed rotor has a chord of . The aircraft has an empty weight of and a gross weight of , giving a useful load of . The
Federal Aviation Administration approved the MH-1 conversion as a distinct aircraft type. ==Specifications (version) ==