Developed in 1958, the helicopter is powered by three turbo-compressors; the tip-jet aircraft can operate on two of its three engines, which can function independently.  The XV-1 Convertiplane rotor was used for the Model 120.  To steer, the engine exhaust was used [Ref Hirschberg. The American Helicopter. Page 62].

Overview

Data on design, manufacture and status

Parent type: No type defined

Aircraft status: No longer flying

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift devices: 1 Single main rotor

Crew required: 1 in Single seater arrangement

Landing gear: Skids

Key Characteristics

Data on key physical features

Aircraft Details

Data on aircraft configuration, weights, flight performance and equipment

References

References and sources used

Helicopters & Autogyros of the World
Paul Lambermont, Anthony Pirie
Cassell & Company Ltd., 1959 (page 339)
Book

Report of Evaluation of the McDonnell Model 120 Flying Crane
United States Army Aviation Board
27 May 1960 (page 2)
Report or Technical Manual

S-47 | S-47/R-4 Helicopter
Vinny Devine
Sikorsky Archives | Product History, Sep 19, 2017 (page 9)
Website
Very thorugh description and details of the R-4 series helicopter

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