A little bit of info, just wanna share
TITLE:
BOEING/SIKORSKY RAH-66 'Comanche'
TYPE:
Two-seat reconnaissance/attack and air combat helicopter
PROGRAMME:
FY 1993 budget delayed development and production phases indefinitely, anticipating Longbow integration from first aircraft; development and production phases reinstated January 1993; further three prototypes to be built for engineering and manufacturing development (EMD phase, in FY 1998-2003; first production procurement in FY 1999; low-rate production of first 24 in FY 2001, followed by 49 in FY 2002, 96 in FY 2003, then 120 per year; IOC in January 2003. Final critical design review completed in December 1993 and authorised production of three YRAH-66 prototypes (first item for which manufactured in September 1993).
CUSTOMERS:
US Army, three dem-val aircraft; up to three EMD aircraft.
COSTS:
$34,000 million programme, including $1,960 million dem/val and $900 million FSD but reduced to $2,240 million dem/val/FSD between 1993-97 by cancellation of three of six planned prototypes; $8.9 million flyaway unit cost (1988 values), increased to $13 million by early 1993. By 1993 (in 1994 dollars, estimated), procurement unit cost $21 million, programme unit cost $27 million.
DESIGN FEATURES:
RAH-66 will be lighter, but only slightly smaller, than AH-64 Apache; specified empty weight of 3,402 kg (7,500 lb) increased 22.5 per cent by early 1992, as result of Army add-ons, including allowance for Longbow radar; mission equipment package has maximum commonality with F-22A ATF technology.
FLYING CONTROLS:
Dual triplex fly-by-wire, with sidestick cyclic pitch controllers and normal collective levers. Main rotor blades removal without disconnecting control system.
STRUCTURE:
Largely composite airframe and rotor system. Fuselage built around composite internal box-beam; non-load-bearing skin panels, more than half of which can be hinged or removed for access to interior (eg., weapons bay doors can double as maintenance work platforms. Eight-blade Fantail rear rotor operable with 12.7mm calibre bullet hits; or for 30 min with one blade missing. Main rotor blades and tail section by Boeing, forward fuselage and final assembly by Sikorsky.
LANDING GEAR:
Retractable tailwheel type, with single wheel on each unit. Main units can 'kneel' for air transportability.
POWER PLANT:
Two LHTEC T800-LHT turboshafts, each rated at 1,002kW (1,344 shp). Transmission rating 1,532 kW (2,054 shp). Internal fuel capacity 984 litres (260 US gallons; 217 Imp gallons) for self-deployment; total fuel capacity 4,467 litres (1,180 US gallons; 982.5 Imp gallons). Main rotor tip speed 196 m (644 ft)/s; 314 rpm.
ACCOMMODATION:
Pilot (in front) and WSO in identical stepped cockpits, pressurised for chemical/biological war fare protection. Crew seats resist 11.6m (38ft)/s vertical crash landing.
AVIONICS:
Martin-Marietta night vision pilotage system and Kaiser/Hamilton Stanford helmet-mounted display; integrated cockpit, second generation FLIR targeting, and digital map display. Dual anti-jam VHF-FM and UHF-AM. Have Quick tactical communications, VHF-AM, anti-jam HF-SSB, airborne target handover system, Navstar GPS, IFF and radar altimeter. Litton AHRS, comprising two fibre optic LN-210C and one LN-100C gyro platforms. Laser warning and radar warning receivers, RF and IR jammers. Miniaturised version of Longbow radar in one-third of fleet although all to have carriage provision. Max avionics commonality required with USAF F-22A ATF programme. Two 15.2 x 20.3cm (6x8) flat-screen LCDs in each cockpit (one monochrome for FLIR/TV, one colour for moving map, tactical situation and night operations), plus a 10.2x10.2cm (4x4in) monochrome LCD for fuel and armament information. Three redundant databases; one low-speed (MIL-STD-1553B), one high-speed and one very high-speed (fibre optic based) for signal data distribution.
ARMAMENT:
General Electric/GIAT three-barrel 20 mm cannon in undernose turret, with up to 500 rounds (320 rds normal for primary mission). Cost-saving option of fixed forward cannon. Side-opening weapons bay door in each side of fuselage, on each of which can be mounted up to three Hellfire or six Stinger missiles or other weapons. Four more Hellfires or eight Stingers can be deployed from multiple carriers under tip of each optional stub-wing, or a 1,741.5 litre (460 US gallon; 383 Imp gallon) auxiliary fuel tank for self-deployment. All weapons can be fired, and targets designated, from push-buttons on collective and sidestick controllers.
DIMENSIONS:
EXTERNAL:
Main rotor diameter: 11,90m (39 ft 1/2 in)
Fnatail diameter: 1.37 m (4ft 6 in)
Fantail blade chord: 0.17 m (6 3/4 in)
Length, overall, rotor turning: 14.28 m (46 ft 10 1/4 in)
(fuselage/excl gun barrel 13.22 m (43 ft 4 1/2 in)
Height over tailplane: 3.39 m (11 ft 1 1/2 in)
Fuselage; Max width: 2.29 m (7 ft 6 in)
Width over mainwheels: 2.31 m (7 ft 7 in)
Tailplane span: 2.82 m (9 ft 3 in)
AREAS:
Main rotor disc: 111.21m/2 (1,197.04 sq ft)
Fantail disc: 1.47m/2 (15.90 sq ft)
WEIGHTS AND LOADINGS:
Empty 3,515kg (7,749 lb)
Empty, combat equipped: (incl Longbow) 4,167kg (9,187 lb)
Max useful load: 1,185kg (2,612 lb)
T-O weight: 4,587kg (10,112 lb)
Max/self-deployability: 7,790kg (17,174 lb)
PERFORMANCE:
(at 1,220 m; 4,000 ft and 34 degrees/C; 95 degrees/F)
Max level (dash) speed: 177 knots (328 km/h; 204 mph)
Vertical rate of climb: 360 m (1,182 ft)/min
Masking: 1.6s 180 degrees hover turn to target 4.7s
Snap turn to target at 80 knots: (148 km/h;92mph) 3.0s
Ferry range with external tanks: 1,260nm (2,334 km; 1,450 miles)
Endurance: 2h 30 min
g limits: +3.5/-1
