The Sikorsky UH-60 Black Hawk is a four-blade, twin-engine, medium-lift utility helicopter manufactured by Sikorsky Aircraft. Sikorsky submitted the S-70 design for the United States Army's Utility Tactical Transport Aircraft System competition in 1972. WikipediaTop speed: 357 km/hFirst flight: 17 October 1974Unit cost: 21,300,000–21,300,000 USD (2012)Variants: Sikorsky SH-60 Seahawk; Sikorsky HH-60 Pave Hawk; Sikorsky MH-60 Jayhawk; Mitsubishi H-60Manufacturer: Sikorsky AircraftNumber built: About 4,000Developed from: Sikorsky S-70