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 the first helicopter to enter service with the U.S. military and the first to be mass produced in the USA.

A video of the aircraft can be viewed on the AHS YouTube site  below,
Source: "Sikorsky R-4B of the 2nd Aircraft Repair Unit (Floating)", Vertical Flight Society YouTube site, Published on 4 Mar 2012

Overview

Data on design, manufacture and status

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift devices: 1 Single main rotor

Dedicated control device: 1 Tail rotor

Crew required: 1-2 in Side-by-side arrangement

Landing gear: Wheels (non-retractable)

Key Characteristics

Data on key physical features

Aircraft Details

Data on aircraft configuration, weights, flight performance and equipment

Related VFS Resources

Resources related to the R-4B/HNS-1/Hoverfly I , provided by the Vertical Flight Society.
Forum Proceedings
 
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Web files from vtol.org
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Related Public Resources

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

Images