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Stearman-Hammond Y-1
Stearman Hammond Y-1 at Langley November 1938.jpg
Role Utility monoplane
National origin United States
Manufacturer Stearman-Hammond Aircraft Corporation
Designer Dean B. Hammond
Number built approx 20

The Stearman-Hammond Y-1 was a 1930s American utility monoplane built by the Stearman-Hammond Aircraft Corporation and evaluated by the United States Navy and the British Royal Air Force.[1]


Stearman Hammond Y-1 at Langley May 1936 NACA 12107

Y-1 testing at Langley

In the early 1930s Dean Hammond designed the Hammond Model Y a low-wing monoplane twin-boom pusher monoplane.[1] Hammond cooperated with the aircraft designer Lloyd Stearman to develop the type for production.[1] They formed the Stearman-Hammond Aircraft Corporation in 1936 to build the aircraft as the Stearman-Hammond Y-1.[1] The first aircraft was powered by a 125 hp (93 kW) Menasco C-4 piston engine driving a pusher propeller.[1] The performance was not impressive so it was re-engined with a 150 hp (112 kW) Menasco C-4S and re-designated the Y-1S.[1] Although designed to be easy to fly the high price meant only 20 aircraft were produced.[1]

The aircraft had no rudder as such, the tailplane fins being adjustable but fixed in flight. Turning was by differential aileron and elevator alone.

Operational historyEdit

In 1934 the Bureau of Air Commerce held a competition for a safe and practical $700 aircraft. In 1936 the winner of the competition was the Stearman-Hammond Y-1, incorporating many of the safety features of the Ercoupe W-1. Two other winners were the Waterman Aeroplane and a roadable autogyro from the Autogiro Company of America- the AC-35. 25 examples were ordered by the bureau at a price of $3190 each. The first delivery was considered unnacceptable in finish, prompting the production of the re-engineered Y-S model.[2]

Two Y-1S, serial numbers 0908 and 0909,[3] were used for radio controlled development trials by the United States Navy as the JH-1.[4] A successful unmanned radio-controlled flight was made with a JH-1 drone on 23 December 1937 at the Coast Guard Air Station, Cape May, N.J. Takeoff and landing was controlled via a landbased radio set; for flight maneuvers, control was shifted to an airborne TG-2.[5]

KLM purchased a Y-1 (PH-APY) for use in training their pilots in tricycle undercarriage.[6] The Royal Air Force also evaluated a former KLM Y-1S in the 1940s.[1]


Hammond Model Y
Prototype for the 1934 Bureau of Air Commerce safe airplane competition.[7][8]
Stearman-Hammond Y-1
Prototype aircraft with a 125hp (93kW) Menasco C-4 engine.
Stearman-Hammond Y-1S
Production aircraft with a 150hp (112kW) Menasco C-4S engine.
United States Navy designation for two Y-1S used for tests.[4]


Flag of the Netherlands.svg Netherlands
Flag of the United Kingdom.svg United Kingdom
United States

Aircraft on displayEdit

Specifications (Y-1S)Edit

Data from Smithsonian Collection[citation needed]

General characteristics
  • Crew: 1
  • Capacity: 1
  • Length: 26 ft 11 in (8.20 m)
  • Wingspan: 40 ft 0 in (12.19 m)
  • Height: 7 ft 7 in (2.31 m)
  • Empty weight: 1,400 lb (635 kg)
  • Gross weight: 2,150 lb (975 kg)
  • Powerplant: 1 × Menasco C-4S piston engine, 150 hp (110 kW)


  • Maximum speed: 113 kn; 209 km/h (130 mph) at 3000 ft (915 m)

See alsoEdit



  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Orbis 1985, p. 2958
  2. Roger D. Launius. Innovation and the development of flight. 
  3. "Aircraft: Stearman-Hammond JH-1" AeroWeb: The Aviation Enthusiast Corner. Web. 3 August 2010. <>.
  4. 4.0 4.1 Andrade 1979, p. 198
  5. Armstrong, William J., and Roy A. Grossnick. United States Naval Aviation, 1910-1995. 4 ed. Washington: Naval Historical Center, 1997. Print.
  6. Flight p482
  7. FLIVVER AIRPLANE DRIVES AS EASILY AS AN AUTOMOBILE Popular Science, October 1935, rare photos of first flying prototype
  8. "Push Type Flivver Plane Easy To Control" Popular Mechanics, October 1935



External linksEdit

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