The ultimate evolution of theDelMar helicopters was the tandem-rotor DH-20. Conceived as a super-portable medical evacuation helicopter, the DH-20 was powered by twin turbine engines and designed to carry a pilot and two passengers, or a pilot and one passenger in a litter. Remarkably, the entire helicopter was able to fold up for ground, sea or air transport, and was capable of operating in and out of far smaller landing zones than a traditional helicopter. As testing of the DH-20 continued, however, the requirement for such missions declined, and the aircraft was never put into production or flown operationally.
Engine: 2 x AiResearch GTP-30-100 turboshafts, rotor diameter: 4.88m, take-off weight: 500kg, max speed: 135km/h, range: 180km
