Developed by 1942, the production aircraft were designated R-4B by the U.S. Army Air Force; HNS-1 by the U.S. Navy (which may be fitted with landing floats) and Hoverfly I by the Royal Navy.  The R-4B/HNS-1 was both the first helicopter to enter service with the U.S. military and the first in the world to go into series production [see reference].

Overview

Data on design, manufacture and status

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift configuration: Single main rotor

Dedicated control device: Tail rotor

Crew required: 1-2

Crew seating: Side-by-side

Landing gear: Wheels (non-retractable)

Overall Dimensions

Data on aircraft size

Overall Height: 3.68 m (12.1 ft)

Overall Length: 14.66 m (48.1 ft)

Overall Width: 11.58 m (38.0 ft)

Engine Details

Aircraft powerplant (lift and/or propulsion)

Total number of engines: 1

Engine designation: Warner R-550-3 Super Scarab reciprocating

Engine manufacturer: Warner

Take-off / rated power: 149 kW (200 hp)

Weights and Performance

Data on aircraft weight and flight characteristics

Max Gross Weight (ground): 1152 kg (2540 lb)

Max Range: 322 km (174 nm)

Related VFS Resources

Resources related to the R-4B/HNS-1/Hoverfly I , provided by the Vertical Flight Society.
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Related Public Resources

Resources related to the R-4B/HNS-1/Hoverfly I , provided by public sources across the internet.

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