Stearman Hammond Y-1S

Stearman Hammond Y-1S
Country	USA
Role	Utility monoplane
First flight	Unknow
Built	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

Source: Stearman Hammond Y-1S on Wikipedia

Stearman Hammond Y-1S Walk Around
Photographer	Vladimir Yakubov
Localisation	Hiller Air Museum, San Carlos, CA
Photos	47

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General Characteristics

The Stearman-Hammond Y-1S was a unique, two-seat experimental aircraft designed in the mid-1930s with safety and ease of control as its primary goals. Its unusual pusher propeller configuration and tricycle landing gear were radical for the time.

Property	Value (Y-1S Production Model)
Role	Experimental Light Aircraft, Safety Design
Manufacturer	Stearman-Hammond Aircraft Corporation
First Flight	1934
Crew	1 pilot
Passenger Capacity	1 passenger (side-by-side seating)
Maximum Take-Off Weight	950 kg (2,090 lb)
Number Built	20 (Approximate)

Design and Powerplant

Engine: One Menasco B6S six-cylinder air-cooled inverted in-line engine.
Power Output: 150 hp (112 kW).
Propeller: Two-bladed propeller mounted behind the wing trailing edge in a pusher configuration.
Landing Gear: Featured a tricycle landing gear (nose wheel and two main wheels), a highly advanced and rare feature in the 1930s, designed to prevent ground looping.
Flight Controls: Simplified three-control system. Notably, yaw and roll were controlled by combined rudders/ailerons (“rudderons”), intended to be easier for non-professional pilots.
Configuration: High-wing, twin-boom monoplane.

Performance and History

Maximum Speed: 204 km/h (127 mph).
Cruise Speed: 185 km/h (115 mph).
Operational Range: Approximately 725 km (450 miles).
Historical Note: The Y-1S won the U.S. Bureau of Air Commerce’s competition for a safe, low-cost private aircraft, but poor sales due to its high price and unusual configuration led to the company’s collapse.
Legacy: Although a commercial failure, its innovative design elements, particularly the pusher engine and tricycle gear, influenced later aircraft safety and general aviation design.