Vertipedia - Sikorsky S-61L

Developed in 1961 as the commercial airline variant of the S-61 with a passenger capacity of either 28 or 25 with galley and toilet. The aircraft can be fitted with removable baggage pods and airstairs.

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: 2 in Side-by-side arrangement

Landing gear: Wheels (all 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

50 inches longer than the original S-61.

Overall Dimensions
Overall Height:	5.08 m	16.7 ft
Overall Length:	22.16 m	72.7 ft
Overall Width:	18.90 m	62.0 ft

Airframe Dimensions
Airframe Length:	17.96 m	58.9 ft
Airframe Width:	4.78 m	15.7 ft
Airframe Height:	4.67 m	15.3 ft

Landing Gear Dimensions
Landing Gear Base:	7.15 m	23.5 ft
Landing Gear Track:	3.96 m	13.0 ft

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

Cruise Speed: 136 mph (218.871 km/h)

Weights
Max Gross Weight (ground):	8,618 kg	19,000 lb
Max Gross Weight (airborne):
Max Take-off Weight:	8,618 kg	19,000 lb
Empty Weight:	4,653 kg	10,259 lb

Climb Performance
Max Rate of Climb:	8 m/s	1,640 fpm

Hover Performance
Hover Ceiling IGE:
Hover Ceiling OGE:

Limitations
Max Level Flight Speed:	235 km/h	127 kts
Never Exceed Speed:
Service Ceiling:	3,505 m	11,499 ft

Range and Endurance
Max Range:	444 km	240 nm
Max Endurance:

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

Powerplant
Number of engines:	2
Designation:	GE CT58-100-1 turbine
Manufacturer:	General Electric Company

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

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

NACA 0012 airfoil

Main Rotor Characteristics
Diameter:	18.90 m	62.00 ft
RPM:	203.0 rpm	203.0 rpm
Direction of Rotation:	Counterclockwise
Hub Type:	Fully articulated

Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:	0.464 m	1.52 ft
Blade Tip Geometry:	Conventional
Blade Twist:	-0.140 rad	-8.000 deg
Number of Blades:	5

Main Rotor Derived Characteristics
Disc Area:	280.48 m²	3019.2 ft²
Disc Loading:	30.73 kg/m²	6.293 lb/ft²
Solidity:	0.0781

Main Rotor Blade Derived Characteristics
Blade area per blade:	4.38 m²	47.1 ft²
Tip Speed:	200.86 m/s	659.0 fps

Tail Rotor Characteristics
Diameter:	3.15 m	10.33 ft
Configuration:	Pusher
Direction of Rotation:	Top blade aft
RPM:	1244 rpm	1244 rpm

Tail Rotor Blade Characteristics
Number of Blades:	5
Blade Construction:
Blade Chord:	0.187 m	0.61 ft
Blade Twist:

Tail Rotor Derived Characteristics
Disc Area:	7.79 m²	83.9 ft²
Solidity:	0.1885

Tail Rotor Blade Derived Characteristics
Tip Speed:	205.15 m/s	673.1 fps
Blade Area (per blade):	0.294 m²	3.16 ft²

References

References and sources used

Helicopters & Autogyros of the World

Paul Lambermont, Anthony Pirie
Cassell & Company Ltd., 1959 (page 390)
Book

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

Vinny Devine
Sikorsky Archives | Product History, Sep 19, 2017 (page 20)
Website
Very thorugh description and details of the R-4 series helicopter

The Sikorsky S-61L

Delear, FJ
AHS Newsletter, 1961, May 1961 (page 6)
Periodical

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Number of engines:	2 Turbines
Max Level Flight Speed:	235 km/h	127 kts
Max Range:	444 km	240 nm
Max Endurance:

Sikorsky S-61L

Related milestones

Sikorsky S-61L

Overview

Configuration

Key Characteristics

Aircraft Details

References

Related VFS Resources

Forum Proceedings

Vertiflite articles

Web files from vtol.org

Webpages from vtol.org

Images from the VFS Gallery

Related Public Resources

Publicly-funded resources provided by the US Government

Public resources provided by select scholarly and academic sources

Additional links

Images

Milestones related to the S-61L

Main Rotor Diameter:	18.90 m	62.00 ft
Max Gross Weight (ground):	8,618 kg	19,000 lb