S-73 HLH
Role	Heavy-lift cargo helicopter Type of aircraft
National origin	United States
Manufacturer	Sikorsky Aircraft
Developed from	CH-54 Tarhe

The Sikorsky S-73^[1] was a proposed aircraft design to meet the United States Army requirement in 1970 for a Heavy Lift Helicopter (HLH) capable of carrying 45,000 lb (20,000 kg; 20 t), a lifting capacity more than twice that of Sikorsky's most powerful helicopter at that time.

The Sikorsky's S-73 design was an enlarged version of the successful CH-54/S-64 with a simplified and improved single main rotor powered by three General Electric TF34-58 turboshaft engines rated at a combined 21,000 hp (15,660 kW). A crew of five would operate the aircraft from the forward cockpit with pushbuttons replacing the traditional cyclic stick and collective lever. Behind the cockpit an aft cabin provided capacity for 12 combat troops.^[2]^[3]

Sikorsky submitted their design in February 1971, then in May the Army declared the Boeing Vertol XCH-62 winner of the contract, ending the Sikorsky S-73 program.^[2]

Specifications

Data from Sikorsky Archives^[2]

General characteristics

Crew: five
Capacity: 12 combat troops or 45,000 lb (20,000 kg) max payload
Length: 110 ft 0 in (33.54 m)
Height: 31 ft (9.4 m)
Empty weight: 59,000 lb (26,762 kg)
Max takeoff weight: 118,000 lb (53,524 kg)
Powerplant: 3 × General Electric TF34-58 turboshaft, 7,000 shp (5,200 kW) each
Main rotor diameter: 124 ft 0 in (37.8 m)
Main rotor area: 2,801 sq ft (260.2 m²) 4-bladed composite construction

References

^ XCH-62 Heavy Lift Helicopter (HLH)
^ ^a ^b ^c Art Linden (June 2013). "Heavy Lift Helicopter, HLH". www.sikorskyarchives.com. Sikorsky Archives. Retrieved 21 May 2017.
^ McKenna, John (2010). Skycrane: Igor Sikorsky's Last Vision. AIAA. p. 106. ISBN 978-1600867569.

v t e Sikorsky aircraft
Fixed-wing aircraft (company designations)	S-1 S-2 S-3 S-4 S-5 S-6 S-7 S-8 S-9 S-10 S-11 S-12 S-13 S-14 S-15 S-16 S-17 S-18 S-19 S-20 S-21 S-22/23/24/25/26/27 S-28 S-29-A S-30 S-31 S-32 S-33 S-34 S-35 S-36 S-37 S-38 S-39 S-40 S-41 S-42 S-43 VS-44 S-45
Fixed-wing aircraft (military designations)	C-6 C-28 JRS JR2S PS P2S RS XBLR-3 XPBS XSS XV-2
Helicopters (company designations)	VS-300 (S-46) S-47 S-48 S-49 S-50 S-51 S-52 S-53 S-54 S-55 S-56 S-57 S-58 S-59 S-60 S-61 S-61L/N S-61R S-62 S-63 S-64 S-65 S-66 S-67 S-68 S-69 S-70 S-71 S-72 S-73 S-74 S-75 S-76 S-80 S-92 S-95 S-97 S-100 S-102 S-103 S-300 S-333 S-434
Helicopters (military designations)	SH-3 Sea King HH-3E/F R-4 H-5 H-6 H-18 H-19 Chickasaw H-34 Choctaw CH-37 Mojave XH-39 HH-52A Seaguard CH-53 Sea Stallion CH-53E Super Stallion CH-53K King Stallion MH-53 CH-54 Tarhe UH-60 Black Hawk HH-60G Pave Hawk HH-60J/MH-60T MH-60R/S Seahawk SH-60B/F Seahawk H-60J/K VH-60 RAH-66 Comanche VH-92 Patriot CH-124 Sea King CH-148 Cyclone HLH
Experimental aircraft	Cypher/Cypher II Firefly Raider Raider X SB-1 X2 XBLR-3 XV-2

Specifications

See also

References