Lockheed AH-56 Cheyenne

Lockheed AH-56 Cheyenne
Land	Usa
Rolle	Angreb helikopter
Første flyvning	21. september 1967
Bygget	10

Den Lockheed AH-56 Cheyenne var en angrebshelikopter udviklet af Lockheed til den amerikanske hær. Det steg fra hærens Advanced Aerial Fire Support System (AAFSS) -program til at stille tjenestens første dedikerede angrebshelikopter. Lockheed designede Cheyenne ved hjælp af et firebladet stivrotorsystem og konfigurerede flyet som en sammensat helikopter med lavt monterede vinger og en halemonteret trykpropel drevet af en General Electric T64 turboakselmotor. Cheyenne skulle have en højhastigheds dash kapacitet til at levere væbnet eskorte til hærens transporthelikoptere, såsom Bell UH-1 Iroquois.

Kilde: Lockheed AH-56 Cheyenne på Wikipedia

AH-56 Cheyenne Walk Around
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General Characteristics and Role

The Lockheed AH-56 Cheyenne was an advanced attack helicopter developed for the United States Army as part of the Advanced Aerial Fire Support System (AAFSS) program during the Vietnam War era. It featured a revolutionary design, combining the agility of a helicopter with the high speed of a fixed-wing aircraft. The Cheyenne utilized a rigid rotor system and a pusher propeller to achieve speeds far greater than conventional helicopters of the time. The aircraft incorporated a sophisticated stabilized gun turret and a separate crew station for the gunner, with the commander/pilot located behind. Though highly innovative and setting several speed records, the program was ultimately canceled in 1972 due to political infighting, high costs, and technical complexity, paving the way for the eventual development of the AH-64 Apache.

Property	Typical Value (AH-56A)
Rolle	Attack and Reconnaissance Helicopter
National Origin	USA
Producent	Lockheed Corporation
First Flight	21. september 1967
Antal bygget	10 Prototypes
Besætning	2 (Pilot/Commander, Gunner)
Length (Fuselage)	16.66 m (54 ft 8 in)
Rotor Diameter	15.62 m (51 ft 3 in)
Højde	4.19 m (13 ft 9 in)
Empty Weight	5,800 kg (12,780 lb)
Max Takeoff Weight	13,380 kg (29,500 lb)

Powerplant and Performance

Engine: One General Electric T64-GE-16 turboshaft engine.
Power Output: 2,927 kW (3,925 hp).
Propulsion System: Combined main rotor, anti-torque tail rotor, and a 3-bladed auxiliary pusher propeller (providing forward thrust at high speeds).
Maximum Speed: 393 km/h (244 mph; 212 kn) (Self-imposed limit; capable of higher speeds).
Range: 1,955 km (1,215 mi; 1,055 nmi).
Unique Feature: Employed a Lockheed rigid rotor system which allowed it to transition smoothly between helicopter and autogyro flight modes, greatly enhancing high-speed stability.

Armament and Fire Control

Armament System: Featured a chin-mounted turret with a 30 mm M129 grenade launcher or 40 mm XM140 grenade launcher, and a belly-mounted 30 mm XM52 cannon turret (operated by the gunner).
Weapon Stations: 6 underwing hardpoints for rockets and missiles. Typical load included:
- Hydra 70 rockets.
- TOW anti-tank guided missiles.
Fire Control: Incorporated an advanced, stabilized gunner’s station, allowing the gunner to rotate 360 degrees and aim independently of the helicopter’s direction of flight. The gunner’s seat rotated with the turret.
Fate: Despite its advanced capabilities, the AH-56 was deemed too complex and expensive, leading to the cancellation of its production contract in 1972.

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