http://www.aviationlive.org Online Aviation Pics,Videos and Forum
The AH-64 Apache is an American all-weather day-night military attack helicopter and is the United States Army's principal attack helicopter, and is the successor to the AH-1 Cobra. The AH-64 is a twin-engined helicopter with four-bladed main and tail rotors. It has a crew of two which sit in tandem. The main fixed armament is a 30 mm M230 chain gun, it is also able to carry a mixture of AGM-114 Hellfire and Hydra 70 rockets on four hard points mounted on its stub-wing pylons.
Designed by Hughes Helicopters in response to the Army's Advanced Attack Helicopter Program. McDonnell Douglas purchased Hughes Helicopters and continued the development of the AH-64 resulting in the AH-64D Apache Longbow which is currently produced by Boeing Integrated Defense Systems. The United States Army's Apaches have been in action in Panama, Gulf War (destroying 500 tanks), Afghanistan, and Iraq.
Following the cancellation of the AH-56 Cheyenne in favor of USAF and Marine projects like the A-10 and Harrier, the United States Army sought an aircraft to fill an anti-armor attack role that would still fall under Army command (the 1948 Key West Agreement having forbidden the Army from commanding fixed-wing aircraft). The Army wanted an aircraft better than the AH-1 Cobra in firepower, performance and range. It would have the maneuverability to fly nap-of-the-earth (NoE) missions. To this end, the US Army issued a Request For Proposals (RFP) for an Advanced Attack Helicopter (AAH) in 1972
Proposals were submitted by five manufacturers: Bell, Boeing-Vertol (teamed with Grumman), Hughes, Lockheed, and Sikorsky. In 1973, the U.S. Department of Defense selected finalists Bell and Hughes Aircraft's Toolco Aircraft Division (later Hughes Helicopters). This began the phase 1 of the competition.
Each company built prototype helicopters and went through a flight test program. Hughes' Model 77/YAH-64A prototype first flew on September 30, 1975, while Bell's Model 409/YAH-63A prototype first flew the following day. After evaluating test results, the Army selected Hughes' YAH-64A over Bell's YAH-63A in 1976. Reasons for selecting the YAH-64A included its more damage tolerant four-blade main rotor and the instability of the YAH-63's tricycle landing gear arrangement.
The AH-64A then entered phase 2 of the AAH program. This called for building three preproduction AH-64s, and upgrading the two YAH-64A flight prototypes and the ground test unit up to the same standard.Weapons and sensor systems were integrated and tested during this time,including the new Hellfire missile