Vertipedia - Vertol CH-46A (HRB-1) Sea Knight

Derived from the Model 107 and also known as the UH-46A under the US Navy. Developed in 1960, the Model 107-2 is a commercial passenger-transport helicopter with a capacity of 25; weight fully loaded is 21400 lb (9707 kg). Two of the organizations to first order the aircraft are New York Airways (replacing the Vertol 44) and the Royal Swedish Navy [Ref. 312, 316]

Overview

Data on design, manufacture and status

Design authority: Vertol Aircraft Corporation

Primary manufacturer: Vertol Aircraft Corporation

Parent type: Vertol Model 107/CH-46

Aircraft status: No longer flying

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift devices: 2 in Tandem (Fore/aft) configuration

Crew required: 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

Update Required: Overall Length [Ref. 309]

Overall Dimensions
Overall Height:	5.13 m	16.8 ft
Overall Length:	25.40 m	83.3 ft
Overall Width:	14.73 m	48.3 ft

Airframe Dimensions
Airframe Length:	13.67 m	44.8 ft
Airframe Width:	4.42 m	14.5 ft
Airframe Height:	5.13 m	16.8 ft

Landing Gear Dimensions
Landing Gear Base:	7.49 m	24.6 ft
Landing Gear Track:	3.89 m	12.8 ft

Cabin Dimensions
Cabin Internal Height:	1.83 m	6.0 ft
Cabin Internal Length:	7.37 m	24.2 ft
Cabin Internal Width:	1.83 m	6.0 ft

Cruise Speed: 148 mph (238.183 km/h)

Weights
Max Gross Weight (ground):	7,734 kg	17,050 lb
Max Gross Weight (airborne):
Max Take-off Weight:	7,734 kg	17,050 lb
Empty Weight:	4,024 kg	8,872 lb
Useful Load:	3,709 kg	8,178 lb
Empty Weight Fraction:	0.520

Climb Performance
Max Rate of Climb:	7 m/s	1,401 fpm

Hover Performance
Hover Ceiling IGE:
Hover Ceiling OGE:

Limitations
Max Level Flight Speed:	254 km/h	137 kts
Never Exceed Speed:	270 km/h	146 kts
Service Ceiling:	4,508 m	14,790 ft

Range and Endurance
Max Range:	431 km	233 nm
Max Endurance:

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

Powerplant
Number of engines:	2
Designation:	GE T58-GE-8 turbine
Manufacturer:	GE Aviation

Normal Ratings
Max continuous:
Take-off / rated:	932 kW	1249 hp
Intermediate:
Maximum:

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

Longitudinal Tandem main rotors

Main Rotor Characteristics
Diameter:	14.73 m	48.33 ft
RPM:
Direction of Rotation:	Counter-rotating
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:	170.46 m²	1834.8 ft²
Disc Loading:	22.69 kg/m²	4.646 lb/ft²
Solidity:

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

Tail Rotor Characteristics
Diameter:
Configuration:	Unknown
Direction of Rotation:	Unknown
RPM:

Tail Rotor Blade Characteristics
Number of Blades:
Blade Construction:	N/A
Blade Chord:
Blade Twist:

Tail Rotor Derived Characteristics
Disc Area:
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 402)
Book

Helicopters from "A to Z" | Part I

Ralph P. Alex
AHS Newsletter, 1961, October, 1961 (page 14)
Periodical

Jane's Helicopter Markets and Systems

Jane's Information Group Limited
2003 (page 99)
Book

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Number of engines:	2 Turbines
Max Level Flight Speed:	254 km/h	137 kts
Max Range:	431 km	233 nm
Max Endurance:

Main Rotor Diameter:	14.73 m	48.33 ft
Max Gross Weight (ground):	7,734 kg	17,050 lb
Useful Load (calculated):	3,709 kg	8,178 lb