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Kaman H-2 Seasprite

 

kamansh2g
SH-2G(NZ)


The basic Seasprite design won a US Navy design competition during 1956 for a high performance, all-weather, multi-role utility helicopter, then designated the HU2K-1. The prototype Seasprite first flew on July 2, 1959 and an initial contract was for four prototypes and twelve production Kaman helicopters, now known as the UH-2A and given the name Seasprite. The initial production UH-2A models were powered by one engine, however, they were equipped for IFR operations and a total of 88 were ultimately built. The UH-2B was VFR equipped and 102 in total were built with fully retractable forward-mounted main landing gears.


The UH-2A and UH-2B could each carry a 1814-kg (4,000-1b) slung load or 11 passengers, and work in planeguard, SAR, fleet reconnaissance, vertrep (vertical re-plenishment) and utility transport duties, operating from many surface warships as well as at shore bases.


The UH-2C, a re-definition of the UH-2 and UH-2B, was the first to be fitted with two engines.


From 1967 Kaman converted of 88 earlier SH-2D Seasprites to the SH-2F version in May 1973. The SH-2F “Super Seasprite” has “up-rated” engines and the LAMPS system (light airborne multi-purpose system). Fifty-two new SH-2Fs were delivered from 1981. Deliveries of the SH-2F version began in May 1973 after completion of 190 early-model UH-2A/B SAR helicopters. Before manufacture was suspended 88 SH-2Fs were built. Deliveries from resumed production began in 1983, and Seasprites deliv-ered after October 1985 have an increased gross weight of 6,124kg, compared with the 5,805kg of earlier SH-2Fs.


With a crew comprising pilot, co-pilot and sensor operator, the SH-2F can carry MASW gear including Cana-dian Marconi LN-66HP surveillance radar, towed 'bird' for the AN/ASQ-18 MAD, AN/ALR-64 passive detection receiver, Difar passive and Dicass active sonobuoys, and comprehensive nav/com and display systems. The 4,000-1b (1814-kg) cargo ability remains, and a 600-1b (272-kg) rescue hoist is standard.


Production of the twin-turbine SH-2F Seasprite Mk.1 light airborne multipurpose system (Lamps I) restarted in 1982, to meet a US Navy requirement for up to 60 helicopters to equip vessels too small for the SH-60B Seahawk. Up to FY1986 54 new-build SH-2Fs had been authorised, and six more were requested in FY1987. These will join some 79 SH-2Fs from earlier production which were still in service at the beginning of 1986, some of which were upgraded SH-2Ds. Ten new SH-2Fs were delivered in 1986.


A re-engined version of the Seasprite, the YSH-2G, flew on April 2, 1985, powered by two General Electric T700 turboshafts similar to those used in the SH-60B and giving improved range, reliability, and maintainability. Evalu-ation of the prototype YSH-2G was completed in 1985. In general terms, the SH-2G is a retrofit of the SH-2F model.


The heart of the SH-2G(NZ)’s weapons platform is its Litton ASN-150/1553B tactical data system, APS-143 (V) 3 radar, Doppler APN-217 (V) 6 radar, FUR Systems AAQ-22 forward-looking infrared system, and Litton Amecon LR-100 electronic support measures ESM sensor system. These systems are operated from the two pilot analogue cockpit, with the observer (air-borne warfare officer) occupying the left-hand seat. The helicopter’s missions are primarily surface sur-veillance and anti-surface warfare, where the helicopter will conduct surveillance tracking and targeting and, if necessary, engage surface targets, but it is also capable of sub-surface weapon delivery and utility support, including search and rescue, replenishment, medical evacuation, naval gunfire spotting and troop transport for boarding operations.

H-2 experiments included stub wings serving as sponsons and gunship version with Minigun chin turret among other weapons.

UH-2A
Engine: 1 x GE T58-GE-8B, 1250-hp.

UH-2C
Engine: 2 x T58-GE-8B.

HH-2D
Engines: 2 x General Electric T58-GE-8F turboshafts, 1,350 hp each.
Length: 38 ft 4 in.
Rotor dia: 44 ft.
Speed: 168 mph.
Ceiling: 22,500 ft.
Range: 445 miles.

SH-2F Seasprite
Engine: 2 x GE T58-8F turboshafts, 1,350-shp (1007-kW).
Installed pwr: 2041 kW.
Rotor dia: 13.4 m (44 ft 0 in).
Main rotor disc area 141.25 sq.m (1,521.0 sq ft).
Fuselage length: 12.3 m (40 ft 6 in), (folded): 11.7 m.
Height: 4.72 m (15 ft 6 in).
No. Blades: 4.
Empty wt: 3193 kg (7,040 lb).
MTOW: 6033 kg (13,300 lb).
Max speed: 265 km/h (165 mph).
ROC: 744 m/min.
Ceiling: 6860 m.
HIGE: 5670 m.
HOGE: 4695 m.
Fuel cap (+aux): 1500 lt ( 455 lt ).
Range max- internal fuel: 680 km (422 miles).
Crew: 3.
Armament: one or two AS torpedoes (usually Mk 46).

SH-2G Super Seasprite
Engine: 2 x GE T700-401.
Instant pwr: 1259 kW.
Rotor dia: 13.41 m.
MTOW: 6124 kg.
Payload: 2107 kg.
Useful load: 987 kg.
Max speed: 141 kts.
Max cruise: 136 kts.
Max range: 869 km.
HIGE: 17,600 ft.
HOGE: 14,600 ft.
Service ceiling: 20,400 ft.
Crew: 3.
Pax: 8.

SH-2G(NZ)
Engines: 2 x T700 GE-401 gas turbines of up to 1723 shp each, plus one Garret GTCP36-150 APU.

 

 


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