Curtiss-Bleecker SX-5-1 Helicopter

Curtiss-Bleecker Helicopter
Role	Helicopter
National origin	United States
Manufacturer	Curtiss Aeroplane and Motor Company
Designer	Maitland B. Bleecker
First flight	1926
Number built	1

The Curtiss-Bleecker Helicopter was an American prototype rotary wing aircraft, introduced in 1926. The thrust of the aircraft was distributed from a central mounted engine through shafts to propellers mounted on each rotor blade.

Design and development

The Bleecker Helicopter was designed by Maitland B. Bleecker, a junior engineer from the National Advisory Committee for Aeronautics. The aircraft was constructed by Curtiss Wright for $250,000 over the course of four years at Garden City.^[1]

The aircraft featured a rotary wing design with a single engine. Each rotor, painted silver and yellow, had an individual propeller for thrust and a trailing control surface called a "stabovator" to change pitch of the rotor. The aircraft was controlled by a stick that operated like a modern helicopter collective control. Yaw was controlled with a "spin vane" that used downwash from the rotor to pivot the aircraft with foot pedals.^[1]

Operational history

Testing on the Bleecker Helicopter was stopped after the failure of a drive shaft on a test flight in 1929.^[2] By 1933 the project was abandoned following vibrational issues in further tests.^[3]

Specifications

Curtiss-Bleecker helicopter 3-view drawing from Aero Digest, July, 1930

Data from NASA^{[citation needed]}

General characteristics

Capacity: 2
Wing area: 370 sq ft (34 m²) Area of rotor blades
Empty weight: 2,800 lb (1,270 kg)
Gross weight: 3,400 lb (1,542 kg)
Fuel capacity: 30 US gallons (114 litres)
Powerplant: 1 × Pratt & Whitney Wasp^[which?] radial piston, 420 hp (310 kW)

Performance

Maximum speed: 70 mph (110 km/h, 61 kn)
Rate of climb: 1,000 ft/min (5.1 m/s)

References

^ ^a ^b "New Plane May Fly Straight Up in Air." Popular Science Monthly, September 1930, pp. 20–21.
^ Bowers, Peter M. (1979). Curtiss Aircraft, 1907–1947. Naval Institute Press. ISBN 978-0-87021-152-2.
^ Leishman, J. Gordon (24 April 2006). Principles of Helicopter Aerodynamics with CD Extra. Cambridge University Press. p. 27. ISBN 978-0-521-85860-1.

External links

Media related to Curtiss-Bleecker SX-5-1 Helicopter at Wikimedia Commons

[PS-1] "New Plane May Fly Straight Up in Air." Popular Science Monthly, September 1930, pp. 20–21.

[Bowers1979-2] Bowers, Peter M. (1979). Curtiss Aircraft, 1907–1947. Naval Institute Press. ISBN 978-0-87021-152-2.

[Leishman2006-3] Leishman, J. Gordon (24 April 2006). Principles of Helicopter Aerodynamics with CD Extra. Cambridge University Press. p. 27. ISBN 978-0-521-85860-1.

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