It rose from the Army's Advanced Aerial Fire Support System (AAFSS) program to field the service's first dedicated attack helicopter. 2.75-inch (70 mm) rockets in 7-rocket or 19-rocket launchers could be carried on the four wing hardpoints. Lockheed designed the Cheyenne using a four-blade rigid-rotor system and configured the aircraft as a compound helicopter. Originally, it was estimated that each individual Cheyenne would cost tax payers just $500,000 USD. The Lockheed AH-56 Cheyenne was an attack helicopter developed by Lockheed for the United States Army. 1.Brenda Forman, What killed the Cheyenne?, Vertiflite May-June 1996 2.Robert Hewson, Lockheed AH-56 Cheyenne, Wings of Fame 14, summer 1999 3.Bill Yenne, Lockheed, Bison 4.Bill Gunston, Lockheed Aircraft Cutaways, Osprey Analysis of the three helicopters determined that the Bell and Sikorsky helicopters could not fulfill the Army's requirements. As a result, there was no natural damping of the rotor pitching motion. The second missile was fired and hit the target. An advanced system like this was also open to many-a-project delay but in many ways this was an accepted part of the program considering its reach - though under McNamara's initiative, there was little room for delay. [16] During early flight tests, a rotor instability issue was discovered when the aircraft was flying at low altitude in ground effect. Note the pusher propeller at the tail. [36] The Department of Defense (DOD) conducted a study that concluded that Air Force's A-X program, the Marine Corps' Harrier, and the Cheyenne were significantly different that they did not constitute a duplication of capabilities. On 9 August 1972, the Army canceled the Cheyenne program. The purpose of the Marks Board was to develop an "updated and defensible" material needs document. 8.) [10] Bell submitted the D-262, a modification of the D-255, but still a conventional helicopter design. With these upgrades, the helicopter surpassed its performance requirements. It rose from the Army's Advanced Aerial Fire Support System (AAFSS) program to field the service's first dedicated attack helicopter. Material presented throughout this website is for historical and entertainment value only and should not to be construed as usable for hardware restoration, maintenance, or general operation. M113 armored personnel carrier. 0 Shares. [28][nb 2], The Army issued a cure-notice[nb 3] to Lockheed on 10 April 1969, citing 11 technical problems, and unsatisfactory progress on the program. See more ideas about Cheyenne, Attack helicopter, Military helicopter. Lockheed AH-56 Cheyenne, possibly the best attack helicopter never made. Initial operating capability was planned for 1972 with an optimistic target of late 1970. | Content ©www.MilitaryFactory.com. The Lockheed AH-56 Cheyenne was slated to become the world’s fastest production attack helicopter, with a speed of just over 250 mph. The first prototype first flew in 1967 and reached speeds of over 240 mph. As the AH-56 program developed, senior US Army personnel began envisioning more roles for the already impressive AH-56 to undertake. [32] Lockheed had studied ways to prevent unstable feedback from the gyro. The solution was to relocate the gyro from the top of the rotor head to below the transmission with flexible connections to the rotor. [35] The Air Force asserted that the Cheyenne would infringe on the Air Force's CAS mission in support of the Army, which had been mandated with the Key West Agreement of 1948. The Army announced a new program for an Advanced Attack Helicopter (AAH) on 17 August 1972, which led to the development of the AH-64 Apache. [26][nb 1], Lockheed and the Army held a 13-minute demonstration "first flight" for the public at the Van Nuys Airport on 12 December 1967. [32], Following the testing at Yuma, prototype #9 received the improved T64-GE-716 engine producing 4,275 shp (3,188 kW) and the planned production version of the ICS system. The aircraft was christened Cheyenne by the Army. (Photo from U.S. Army) The Cheyenne was not a conventional helicopter. Search for Lockheed AH-56 Cheyenne and quickly find all products, articles, walkarounds and books related to this topic. The Cheyenne was powered by a General Electric T64 turboshaft engine. [17][18] Manufacture of the 10 Cheyenne prototypes was completed by 1969. Landis and Jenkins 2000, pp. I believe that this should be the AH-56A Cheyenne page and the 'AH-56 … Preliminary designs were submitted by Lockheed and Sikorsky. The winner of the AH-56 fast-moving helicopter transports ferrying troops into combat zones! 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