But a funny thing happened with Comanche, making it worth a look. A pair of RAH prototypes were constructed and underwent flight testing between and Subsequently, the Army decided to pursue development of another battlefield scout helicopter under the Armed Reconnaissance Helicopter program; this resulted in another rotorcraft, designated as the Bell ARH , being selected and developed with the intention to replace the OHD in place of the Comanche. In addition, the RAH was capable of internally carrying a maximum of six AGM Hellfire air-to-ground missiles or up to twelve AIM Stinger air-to-air missiles , which would be evenly divided between a pair of retractable weapons pylons. Early helicopters had metal bearings for all three motions and these were grease lubricated.
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Archived from the original on 24 August From Wikipedia, the free encyclopedia. This was the first time that a PSA was used in an aircraft environmental control system. Prized elements of the program, such as certain software capabilities and its integration, failed to foster confidence with Army overseers; several comanhce were viewed as having been unproven and risky, while the anticipated consumption of up to 40 per cent of the aviation budget by the Comanche alone for a number of years was considered to be extreme.
The crew of two – pilot and weapons specialist – sat in stepped tandem with good visibility over the surrounding terrain. Production quantity was reduced from 1, towith a peak annual build rate of 60 aircraft per year.
Real Lessons From an Unreal Helicopter
Extensive use of advanced materials, primarily composites, was a key to lowering production cost and aircraft weight. To reduce the visual signature the aircraft was kept small and specific considerations were applied to reduce canopy glint.
This formula is much lauded among defense acquisition experts and leaders, but was clearly not implemented by the Comanche team. Its primary mission was scouting using its advanced sensors, in particular locating and designating targets for attack helicopters, such as the AH Apache, to strike. Archived from the original PDF on 28 June The first LRIP Low Rate Initial Production aircraft was to be near production standards from an air vehicle standpoint and fully equipped for the armed reconnaissance mission.
Boeing–Sikorsky RAH Comanche – Wikipedia
Quoting an article in the internal Sikorsky magazine, Inside Sikorsky, from April, MEP performance compared to the AH in A conventional tail rotor was not acceptable. Symbology for heads-up and eyes-out operation was rh-66.
A final reduction stage of a simple spur or bevel gear is impossible since the tooth loads on that single gear mesh are excessive.
When scheduled delivery begins in earlythe Comanche will be the most advanced helicopter in the world — and the first to use stealth technology. In actuality, it became one of the most positive attributes of the Boeing Sikorsky design.
Sikorsky Product History
Requirement First Team Design. Where applicable, the appearance of U. Retrieved 10 September The IR signature was reduced by using a unique engine exhaust system which ducted the exhaust into the tailcone where it was mixed with cool ambient air before it exited the aircraft. The Comanche was designed for air transportability in a number of Air Force transports. Unlike virtually all other helicopters and fixed wing aircraft for that matter it was decided not to use the exterior surfaces of the aircraft for the primary fuselage structure.
The contract between the Army and Boeing Sikorsky was for full-scale development. The clean air was then distributed to the cockpit and protected avionic compartments. Aircraft 2 made its first flight with new MEP software and the more powerful engines on May 23, Had it been serially produced, the RAH would have been the world’s most advanced combat helicopter in service with any army anywhere in the world.
Real Lessons From an Unreal Helicopter |
First flight came on January 4th, Duringthe Comanche program underwent heavy restructuring; consequently, the number of Comanches that were intended to be purchased was rah6-6 down to rotorcraft.
A hydraulic intensifier was used to provide psi hydraulics for the SPU startup and for landing gear emergency blow-down. The MEP software provided the foundation for the aircraft operating system and would support the pilotage, vehicle systems reporting and health, and the digital map function. This was a long way from the Vietnam-era helicopters where the enemy knew a helicopter was approaching long before it got there, simply from its acoustic signature.
This included a search-on-the-move function; moving target detection; and automatic multitarget prioritization, tracking, weapons selection and fire control.