Sikorsky Aircraft S-56 (H-37 / CH-37 Mojave)
Heavy Transport Helicopter
Photo ©: Karsten Palt
The Sikorsky S-56 is a heavy twin-engined transport helicopter with a capacity of 36 passengers built by the American manufacturer Sikorsky Aircraft. Main productions variant were the CH-37A (H-37A) of the US Army and the CH-37C (HR2S-1) of the US Marine Corps.
The Sikorsky S-56 is the largest piston-engine helicopter ever built. Nearly all (90 of the 94 built) CH-37A helicopters were later modified to the CH-37B version. Some S-56 were operated after military service by Keystone Helicopters.
| Crew | 2 | |
| Passengers | 36 | |
| Propulsion | 2 Radial Engines | |
| Engine Model | Pratt & Whitney R-2800-54 Double Wasp | |
| Engine Power (each) | 1566 kW | 2100 hp |
| max. Cruise Speed | 211 km/h | 114 kts 131 mph |
| max. Speed (vne) | 241 km/h | 130 kts 150 mph |
| Service Ceiling | 2.652 m | 8.700 ft |
| Rate of climb | 528 m/min | 1732 ft/min |
| Range | 400 km | 216 NM 249 mi. |
| Empty Weight | 9.072 kg | 20.000 lbs |
| max. Takeoff Weight | 14.061 kg | 31.000 lbs |
| Rotor Blades (main/tail) | 5/4 | |
| Main Rotor Diameter | 22,00 m | 72 ft 2 in |
| Tail Rotor Diameter | 4,75 m | 15 ft 7 in |
| Rotor Disc Area | 380,1 m² | 4091 ft² |
| Length (Fuselage) | 19,80 m | 64 ft 12 in |
| Length | 26,80 m | 87 ft 11 in |
| Height | 6,71 m | 22 ft 0 in |
| First Flight | 18.12.1953 | |
| Production Status | out of production | |
| Total Production | 154 | |
| Data for (Version) | Sikorsky S-56 | |
| Variants | CH-37A, CH-37B, CH-37C | |
| [Photo-ID: 11188] © Karsten Palt 2015-06-03 | |
 | Sikorsky CH-37B Mojave United States Army Reg.: 58-1005 c/n: 56-150 |
| Pima Air and Space Museum [Tucson, AZ] | |
| [Photo-ID: 11189] © Karsten Palt 2015-06-03 | |
 | Sikorsky CH-37B Mojave United States Army Reg.: 58-1005 c/n: 56-150 |
| Pima Air and Space Museum [Tucson, AZ] | |