Vertipedia - Sikorsky S-67 Blackhawk

The aircraft was designed as a low-cost tactical helicopter demonstrator, based around the rotors, engines, hydraulic/electrical systems, and drive train of the S-61/H-3 series aircraft. It was a "semi-compund" design in that it was equipped with a lifting wing to off-load the rotor in high speed flight, but did not feature any auxiliary propulsion systems.

The main wheels were fully retractable but the tail wheel was fixed.

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: Compound Helicopter

Compound type: Lift

Lift devices: 1 Single main rotor

Dedicated control device: 1 Tail rotor

Crew required: 2 in Tandem arrangement

Landing gear: Wheels (some 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

The S-67 was intended to field a thermally- and acoustically-insulated troop compartment for six troops, with access provided through a door on the left side of the fuselage.

Overall Dimensions
Overall Height:	4.95 m	16.3 ft
Overall Length:	22.58 m	74.1 ft
Overall Width:	18.90 m	62.0 ft

Airframe Dimensions
Airframe Length:	19.74 m	64.8 ft
Airframe Width:	8.33 m	27.3 ft
Airframe Height:	4.57 m	15.0 ft

Landing Gear Dimensions
Landing Gear Base:	11.02 m	36.2 ft
Landing Gear Track:	2.13 m	7.0 ft

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

Weights
Max Gross Weight (ground):	9,979 kg	22,000 lb
Max Gross Weight (airborne):
Max Take-off Weight:	9,979 kg	22,000 lb
Empty Weight:	5,681 kg	12,525 lb

Climb Performance
Max Rate of Climb:	10 m/s	2,000 fpm

Hover Performance
Hover Ceiling IGE:	2,957 m	9,700 ft
Hover Ceiling OGE:	1,981 m	6,500 ft

Limitations
Max Level Flight Speed:	324 km/h	175 kts
Never Exceed Speed:	370 km/h	200 kts
Service Ceiling:	5,180 m	16,995 ft

Range and Endurance
Max Range:	522 km	282 nm
Max Endurance:

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

Powerplant
Number of engines:	2
Designation:	GE T58-GE-5 turbine
Manufacturer:	General Electric Company

Normal Ratings
Max continuous:	933 kW	1250 hp
Take-off / rated:	1119 kW	1500 hp
Intermediate:	1044 kW	1400 hp
Maximum:

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

SH-3D main rotor head

Main Rotor Characteristics
Diameter:	18.90 m	62.00 ft
RPM:	195.9 rpm	195.9 rpm
Direction of Rotation:	Counterclockwise
Hub Type:	Fully articulated in flap and lag

Main Rotor Blade Characteristics
Blade Construction:
Blade Chord:	0.464 m	1.52 ft
Blade Tip Geometry:	20 degrees swept
Blade Twist:	-0.070 rad	-4.000 deg
Number of Blades:	5

Main Rotor Derived Characteristics
Disc Area:	280.48 m²	3019.2 ft²
Disc Loading:	35.58 kg/m²	7.287 lb/ft²
Solidity:	0.0781

Main Rotor Blade Derived Characteristics
Blade area per blade:	4.38 m²	47.1 ft²
Tip Speed:	193.85 m/s	636.0 fps

SH-3D tail rotor hub. NACA 0012 tail blade airfoil section.

Tail Rotor Characteristics
Diameter:	3.51 m	11.52 ft
Configuration:	Pusher
Direction of Rotation:	Unknown
RPM:

Tail Rotor Blade Characteristics
Number of Blades:	5
Blade Construction:
Blade Chord:	0.186 m	0.61 ft
Blade Twist:	0.00 rad	0.0 deg

Tail Rotor Derived Characteristics
Disc Area:	9.68 m²	104.2 ft²
Solidity:	0.1690

Tail Rotor Blade Derived Characteristics
Tip Speed:
Blade Area (per blade):	0.327 m²	3.52 ft²

References

References and sources used

S-67 Flight Test program

Richard M. McCutcheon
Paper presented the 28th Annual National Forum of the American Helicopter Society, May 1972 (page 8)
Meeting paper or Presentation
Comprehensive description of the aircraft and it's flight test program

The S-67 Blackhawk

Art Linden
The Sikorsky Archives | Sikorsky product History, May 2012
Website
Comprehensive description of the aircraft and its design and development

The Twin-Engine BO-105

A.C. Ballauer and P. F. Sheridan
VERTIFLITE August 1969, August 1969
Periodical
Good description of the overall vehicle