Vertipedia - Sikorsky VS-316A/R-6A

Developed in 1943. The helicopter can be modified from two-passenger capacity to four for the U.S. Coast Guard by replacing the fuel tanks with external ones. Designated HOS-1 in the US Navy.

Overview

Data on design, manufacture and status

Design authority: Sikorsky Aircraft Division, United Aircraft and Transport Corporation

Primary manufacturer: Sikorsky Aircraft Division, United Aircraft and Transport Corporation

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

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

Layout and Dimensions

Weights and Performance

Engine Details

Primary Lift Device

Primary Control Device

Overall Dimensions
Overall Height:	3.53 m	11.6 ft
Overall Length:	14.61 m	47.9 ft
Overall Width:	11.58 m	38.0 ft

Airframe Dimensions
Airframe Length:	10.34 m	33.9 ft
Airframe Width:
Airframe Height:	3.53 m	11.6 ft

Landing Gear Dimensions
Landing Gear Base:	3.12 m	10.3 ft
Landing Gear Track:	2.74 m	9.0 ft

Cabin Dimensions
Cabin Internal Height:
Cabin Internal Length:
Cabin Internal Width:

Cruise Speed: 75 mph (120.701 km/h)

Weights
Max Gross Weight (ground):	1,406 kg	3,100 lb
Max Gross Weight (airborne):
Max Take-off Weight:	1,406 kg	3,100 lb
Empty Weight:	914 kg	2,016 lb

Climb Performance
Max Rate of Climb:	4 m/s	801 fpm

Hover Performance
Hover Ceiling IGE:
Hover Ceiling OGE:

Limitations
Max Level Flight Speed:	153 km/h	83 kts
Never Exceed Speed:	185 km/h	100 kts
Service Ceiling:	3,048 m	10,000 ft

Range and Endurance
Max Range:	644 km	348 nm
Max Endurance:

Provided powerplant data is for uninstalled, sea level, static operations.

Powerplant
Number of engines:	1
Designation:	Franklin O-405-9 reciprocating
Manufacturer:	Franklin Engine Company

Normal Ratings
Max continuous:
Take-off / rated:
Intermediate:
Maximum:

OEI Ratings
OEI contingency:
OEI continuous:
OEI 30-second:
OEI intermediate:

Main Rotor Characteristics
Diameter:	11.58 m	38.00 ft
RPM:
Direction of Rotation:	Counterclockwise
Hub Type:	Fully articulated

Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:
Blade Tip Geometry:
Blade Twist:
Number of Blades:	3

Main Rotor Derived Characteristics
Disc Area:	105.36 m²	1134.2 ft²
Disc Loading:	13.35 kg/m²	2.733 lb/ft²
Solidity:

Main Rotor Blade Derived Characteristics
Blade area per blade:
Tip Speed:

Tail Rotor Characteristics
Diameter:	2.50 m	8.21 ft
Configuration:	Tractor
Direction of Rotation:	Top blade aft
RPM:

Tail Rotor Blade Characteristics
Number of Blades:	3
Blade Construction:
Blade Chord:
Blade Twist:

Tail Rotor Derived Characteristics
Disc Area:	4.92 m²	52.9 ft²
Solidity:

Tail Rotor Blade Derived Characteristics
Tip Speed:
Blade Area (per blade):

References

References and sources used

Helicopters & Autogyros of the World

Paul Lambermont, Anthony Pirie
Cassell & Company Ltd., 1959 (page 378)
Book

S-47 | S-47/R-4 Helicopter

Vinny Devine
Sikorsky Archives | Product History, Sep 19, 2017 (page 15)
Website
Very thorugh description and details of the R-4 series helicopter

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Images

Overview

Attribution

Number of engines:	1 Reciprocating
Max Level Flight Speed:	153 km/h	83 kts
Max Range:	644 km	348 nm
Max Endurance:

Main Rotor Diameter:	11.58 m	38.00 ft
Max Gross Weight (ground):	1,406 kg	3,100 lb