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Sikorsky S-69
| S-69/XH-59 | |
|---|---|
| Sikorsky S-69/XH-59 with auxiliary turbojets | |
| Type | Experimental helicopter |
| Manufacturer | Sikorsky Aircraft |
| Maiden flight | July 26 1973 |
| Primary users | NASA United States Army United States Navy |
| Number built | 2 |
The Sikorsky S-69 was an experimental compound co-axial helicopter developed as part of the Advancing Blade Concept (ABC) program.
Sikorsky S-69
Also known by the military designation XH-59A, the S-69 was part of the Advancing Blade Concept (ABC) program.[1] This Advancing Blade Concept system consisted of two rigid, contra-rotating rotors which made use of the aerodynamic lift of the advancing blades. At high speeds, the retreating blades were offloaded, as most of the load was supported by the advancing blades of both rotors and the penalty due to stall of the retreating blade was thus eliminated. This system did not even require a wing to be fitted for high speeds and to improve manoeuvrability, and also eliminated the need for an anti-torque rotor at the tail.[2]
Specifications (S-69)
Data from U.S. Army Aircraft Since 1947[3], Avia.Russian.ee Website[2]
General characteristics
- Crew: 2
- Length: 40 ft 9 in (12.42 m)
- Rotor diameter: 36 ft 0 in (10.97 m)
- Height: 13 ft 2 in (4.01 m)
- Empty weight: lb (kg)
- Loaded weight: lb (kg)
- Useful load: lb (kg)
- Max takeoff weight: 9,000 lb (without turbojets) (11,000 lb (with turbojets))
- Powerplant:
- 2× Pratt & Whitney J60-P-3A turbojet, 3,000 lbf (1,350 kN) each
- 1× Pratt & Whitney Canada PT6T-3 Turbo Twin Pac turboshaft, 1,825 hp (1,360 kW)
- *Rotor: 2 three-bladed co-axial
Performance
- Never exceed speed: knots (mph, km/h)
- Maximum speed: 322 mph, 518 km/h (184 mph, 296 km/h)
- Cruise speed: knots (125 mph, 185 km/h)
- Stall speed: knots (mph, km/h)
- Range: nm (mi, km)
- Service ceiling: 15,000 ft (4,570 m)
References
- ↑ Michael J Taylor: The Illustrated Encyclopedia of Helicopters, page 20. Exeter Books, New York, NY USA, 1984. ISBN 0-671-07149-1
- ↑ 2.0 2.1 Sikorsky S-69 / XH-59. Retrieved on 2007-6-21.
- ↑ Harding, Stephen (1997). U.S. Army Aircraft Since 1947. Atglen, PA, USA: Schiffer Publishing Ltd., 251. ISBN 96-69996.
External links
- Sikorsky S-69
- Global Security.org Sikorsky XH-59 page
- Sikorsky X2
- "X2 marks the spot for radical rotor designs" FlightGlobal
See also
Related development
Comparable aircraft
Designation sequence
Related lists
Lists relating to aviation | |
|---|---|
| General | Timeline of aviation · Aircraft · Aircraft manufacturers · Aircraft engines · Aircraft engine manufacturers · Airports · Airlines |
| Military | Air forces · Aircraft weapons · Missiles · Unmanned aerial vehicles (UAVs) · Experimental aircraft |
| Notable incidents and accidents | Military aviation · Airliners · General aviation · Famous aviation-related deaths |
| Records | Flight airspeed record · Flight distance record · Flight altitude record · Flight endurance record · Most produced aircraft |
Lists relating to aviation | |
|---|---|
| General | Timeline of aviation · Aircraft · Aircraft manufacturers · Aircraft engines · Aircraft engine manufacturers · Airports · Airlines |
| Military | Air forces · Aircraft weapons · Missiles · Unmanned aerial vehicles (UAVs) · Experimental aircraft |
| Notable incidents and accidents | Military aviation · Airliners · General aviation · Famous aviation-related deaths |
| Records | Flight airspeed record · Flight distance record · Flight altitude record · Flight endurance record · Most produced aircraft |
Template:USAF helicopters Template:Sikorsky Aircraft
| This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Sikorsky S-69". |
