H-550 Stallion Turboprop powered development H-580 Twin Courier A longer nosed H-500 with twin wing mounted piston engines, five built. H-634 Twin Stallion Planned twin Allison C250 powered Stallion. H-700 Courier H-295 with redesigned wing and undercarriage and Lycoming TIO-540-J2B engine. H-800 Courier H-700 with Lycoming IO-720-A1B engine, 18 built (H-700 and H-800 together). L-24 Courier Military version of the H-391 Courier. L-28 Courier Military version of the H-395 Courier. U-5 Twin Courier Probable front designation for CIA Twin Couriers. U-10 Courier Re-designation of L-28 Courier Helio AU-24 Stallion Military designation for H-550 Stallion Operators Military operators Bophuthatswana Air Force – 2 operated from 1982. Guyana Defence Force Italian Air Force operated 1 Helio Courier aircraft from 1961 to 1982 Royal Thai Air Force Civil Air Patrol United States Air Force 4410th Combat Crew Training Squadron United States Army Civil operators Air America JAARS North-Wright Airways Wright Air Service Aircraft on display Thailand 7135 – Type 1 on display at the Royal Thai Air Force Museum in Bangkok. It has the USAF serial number 66-14332. United States Original "Helioplane No.1" demonstrator aircraft is in storage at the Paul Garber Facility of the National Air and Space Museum in Suitland, Maryland. 62-3606 – U-10A on static display at the Memorial Air Park at Hurlburt Field in Mary Esther, Florida. 63-13096 – U-10B on static display at the Museum of Aviation at Robins Air Force Base in Warner Robins, Georgia. 66-14360 – U-10D on static display at the National Museum of the United States Air Force at Wright-Patterson Air Force Base in Dayton, Ohio. 1216 – H-295 on static display at the Alaska Aviation Museum in Anchorage, Alaska. It was formerly owned by Lowell Thomas Jr. Specifications (U-10D Super Courier) See also References Notes Bibliography Ogden, Bob. Aviation Museums and Collections of North America. Tonbridge, Kent, UK: Air-Britain (Historians) Ltd, 2007. . Simpson, R. W. Airlife's General Aviation. Shrewsbury, UK: Airlife Publishing, 1995, pp. 208–210. . Taylor, Michael J. H. Jane's Encyclopedia of Aviation. London: Studio Editions, 1989. . World Aircraft Information Files. London: Bright Star Publishing, File 896, sheet 18. External links Helio Aircraft homepage Smithsonian NASM page on Helioplane #1, awaiting restoration NMUSAF Page on Helio Super Courier Modern aerial photography Courier operator HelioCourier.Net "Rugged Light Plane Takes to the Air After 30-yard Run." Popular Mechanics'', November 1954, p. 144. A Low-Cost Air Transportation and Communication System for Remote Areas