Boeing / Sikorsky RAH-66 Comanche
United States (2004)
The Boeing-Sikorsky joint-venture RAH-66 Comanche light attack helicopter was to become the first stealth-centric combat helicopter in the world - that is until the project was terminated in 2004.
Detailing the development and operational history of the Boeing / Sikorsky RAH-66 Comanche Reconnaissance / Light Attack Helicopter. Entry last updated on 6/15/2018. Authored by Staff Writer. Content ©www.MilitaryFactory.com
Origins of the RAH-66 began with the LHX program (Light Helicopter Experimental) of 1982, the design proposal forwarded by a joint Boeing-Sikorsky. The Request for Proposal (RFP) was not enacted until 1988 to which, by now, the U.S. Army requirement had been evolved along the lines of a light reconnaissance-minded attack helicopter. In 1990, the program was given a new name as the Light Helicopter (LH) program and the following year saw the Boeing-Sikorsky submission officially selected as the winner of the program with the U.S. Army seeking four flyable prototypes (YRAH-66) in this early stage. By this time, the product was handed the official designation of "RAH-66" with the name of "Comanche".
Construction on the first airframe commenced in 1993 though the U.S. Army order now contracted for just two prototypes. The aircraft was unveiled in May of 1995 and delivered to Florida for the flight testing phase - the first flight delayed by one year already. First flight by the initial prototype was carried out in 1996 with a second prototype not to join the flight testing phase until later in the decade - recording its first flight on March 30th, 1999.
The compact design adopted a small profile and sharp lines seen previously in the multi-faceted Lockheed F-117 "Nighthawk" during a time when angled panels were the norm for stealth-centric aircraft (since abandoned in more modern stealth designs such as the Lockheed F-22 "Raptor" air superiority fighter). The RAH-66 was given a large five-blade composite main rotor system with a tail rotor housed in a shroud, similar in concept to the French "Fenestron" approach. Internal weapons bays were intended from the beginning as was a retractable powered, wheeled undercarriage. Optional stub wings allowed the helicopter more tactical flexibility when using varied ordnance options though at the cost of a larger radar signature. Standard, fixed armament was a powered 20mm three-barrel General Electric autocannon in a French GIAT turret. The crew of two - pilot and weapons specialist - sat in stepped tandem with good visibility over the surrounding terrain. The RAH-66 was given state-of-the-art flight control systems that included helmet-mounted displays, side-stick cyclic controlling, 3D moving map displays, and Fly-By-Wire (FBW) with triple redundancy feature. Additional components included Forward-Looking Infrared (FLIR) and an onboard self-laser designator for precision munitions. The Hughes Apache Longbow's millimeter wave radar was also standard equipment.
Power came from 2 x LHTEC T800-LHT-801 series turboshaft engines developing 1,563 horsepower each and driving the five-bladed main rotor with an eight-bladed fan-in-fin tail rotor unit. Maximum speed was 200 miles per hour with a range out to 1,382 miles and service ceiling of 15,000 feet. Rate-of-climb was 895 feet per minute.
On the hypothetical battlefield, the RAH-66 system would have supported allied forces by engaging enemy armor at range. The helicopter was granted the scan and track capabilities of the Apache Longbow with the nimbleness of the Bell OH-58 Kiowa series. Weapons support included the Hellfire anti-tank missile, Stinger air-to-air missile as well as Hydra 2.75" rocket pods. The optional wingstubs nearly doubled the ordnance-carrying totals when fixed.
Despite all this, the Comanche product never came to fruition as the entire project was cancelled by the United States Army in the Spring of 2004, mostly due to budgetary cutbacks. It proved more fiscally responsible to simply modernized an aged stock than to procure an expensive, technologically-laden attack system in the numbers required.
The two prototypes have survived the test of time, residing at the United States Army Aviation Museum at Fort Rucker, Alabama.
Any available statistics for the Boeing / Sikorsky RAH-66 Comanche Reconnaissance / Light Attack Helicopter are showcased in the areas immediately below. Categories include basic specifications covering country-of-origin, operational status, manufacture(s) and total quantitative production. Other qualities showcased are related to structural values (namely dimensions), installed power and standard day performance figures, installed or proposed armament and mission equipment (if any), global users (from A-to-Z) and series model variants (if any).
General Assessment (BETA)
Relative Maximum Speed Rating
This entry's maximum listed speed (201mph).
Graph average of 225 miles-per-hour.
Relative Operational Ranges
Graph showcases the Boeing / Sikorsky RAH-66 Comanche's operational range (on internal fuel) when compared to distances between major cities.