Home Aircraft / Aviation Naval Warfare Land Systems Small Arms

Boeing / Sikorsky RAH-66 Comanche

Reconnaissance / Light Attack Helicopter

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.
Authored By: Staff Writer | Last Edited: 3/5/2020
At one point, the Sikorsky RAH-66 Comanche was set to become the future of U.S. Army rotary-wing aviation. It was a stealth-based light attack helicopter set to replace an aging stock of Bell UH-1 "Huey" gunships, Bell AH-1 "Cobra" light attack helicopters, Hughes OH-6 "Cayuse" light observation and attack helicopters, and Bell OH-58 "Kiowa" light helicopters. The RAH-66 was the world's first purpose-built stealth attack helicopter complete with fully-powered internal bays housing anti-armor and anti-air missiles and promoted heavy use of stealth materials to help conceal its approach from enemy radar. Had it been serially produced, the RAH-66 would have been the world's most advanced combat helicopter in service with any army anywhere in the world. First flight came on January 4th, 1996.

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.


[ 2 Units ] :
Boeing Helicopters / Sikorsky Aircraft Corporation - USA
National flag of United States United States (cancelled)
- Ground Attack
- Close-Air Support (CAS)
- Reconnaissance (RECCE)
- X-Plane / Developmental
43.31 ft (13.2 m)
39.04 ft (11.9 m)
11.06 ft (3.37 m)
(Showcased structural dimension values pertain to the Boeing / Sikorsky RAH-66 Comanche production model)
Empty Weight:
9,304 lb (4,220 kg)
17,417 lb (7,900 kg)
(Diff: +8,113lb)
(Showcased weight values pertain to the Boeing / Sikorsky RAH-66 Comanche production model)
2 x LHTEC T800-LHT-801 turboshaft engines developing 1,563 horsepower each while driving a five-blade main rotor with an eight-blade "fan-in-fin" shrouded tail rotor.
(Showcased powerplant information pertains to the Boeing / Sikorsky RAH-66 Comanche production model)
Maximum Speed:
201 mph (324 kph; 175 kts)
Service Ceiling:
14,980 feet (4,566 m; 2.84 miles)
Maximum Range:
1,382 miles (2,224 km; 1,201 nm)
895 ft/min (273 m/min)
(Showcased performance values pertain to the Boeing / Sikorsky RAH-66 Comanche production model; Compare this aircraft entry against any other in our database)
1 x 20mm XM301 three-barrel cannon in chin turret.

6 x Hellfire anti-tank missiles OR 6 x Stinger air-to-air missiles OR 24 x Hydra 70 2.75" air-to-surface rockets.

8 x Hellfire anti-tank missiles OR 16 x Stinger air-to-air missiles OR 56 x Hydra 70 2.75" air-to-surface rockets.
(Showcased armament details pertain to the Boeing / Sikorsky RAH-66 Comanche production model)
RAH-66 "Comanche" - Base Series Designation
YRAH-66 - Prototype Model Designation; two constructed.
Cockpit image of the Boeing / Sikorsky RAH-66 Comanche
(Cockpit image represents the Boeing Sikorsky RAH-66 Comanche production model)

Disclaimer | Privacy Policy | Cookies

The "Military Factory" name and MilitaryFactory.com logo are registered ® U.S. trademarks protected by all applicable domestic and international intellectual property laws. All written content, illustrations, and photography are unique to this website (unless where indicated) and not for reuse/reproduction in any form. 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. We do not sell any of the items showcased on this site. Please direct all other inquiries to militaryfactory AT gmail.com.

Part of a network of sites that includes AnvilOfWar.com, GlobalFirepower, a data-driven property used in ranking the top military powers of the world, and WDMMA.org, the World Directory of Modern Military Aircraft.

www.MilitaryFactory.com • All Rights Reserved • Content ©2003-