Sikorsky S-67 Blackhawk

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S-67

The Sikorsky S-67 Blackhawk was a private-venture, prototype attack helicopter built in 1970. A tandem, two-seat aircraft designed around the rotor system of the Sikorsky S-61, it was designed to serve as an attack helicopter or to transport up to 15 troops into combat.

1 History
2 Specifications (S-67 Blackhawk)
3 References
4 Related content

[edit] History

When the Lockheed AH-56 Cheyenne failed to live up to expectations, Sikorsky offered an intermediate aircraft consisting of an armed version of its S-61 (which evolved into the Sea King helicopter). Sikorsky then designed a simplified AAFSS using the maximum number of components from the S-61.

The result was the Sikorsky S-67 Blackhawk , which featured a five-bladed main rotor and tail rotor. The main wheels were retractable. It had speed brakes on the wing trailing edges, which also improved maneuverability.

The S-67 was fitted with night vision systems, a Tactical Armament Turret (TAT-140) with a 30 mm cannon, 16 130 mm TOWs, and 2.75 inch rockets or Sidewinder air-to-air missiles. The Blackhawk was powered by two General Electric T58-GE-5 1500 shp engines.

The S-67 established an E-1 class world speed record on December 14, 1970 by flying at 216.84 mph (188.4 knots) over a 1.86 mile (3 km) course. Near the end of the test program, the Blackhawk, by substituting a ducted fan for the tail unit, reached a speed of 230 mph (199.9 knots) in a test dive in 1974.

The Blackhawk was put through a long series of tests from 1970 to 1974, but was judged unsatisfactory by the Army. The lone prototype crashed while conducting a demonstration at the Farnborough Air Show in 1974 killing Sikorsky test pilots Kurt Cannon and Stu Craig.^{[citation needed]}

[edit] Specifications (S-67 Blackhawk)

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General characteristics

Crew: 2
Capacity: 15 troops
Payload: 4,000 lb ()
Length: 74.15 ft (22.6 m)
Rotor diameter: 62 ft (18.9 m)
Height: ()
Empty weight: 12,524 lb (5681 kg)
Max takeoff weight: 24,272 lb (11,010 kg)
Powerplant: 2× General Electric T58-GE-16 turboshaft engine, 1870 shp () each