Vertipedia - Sikorsky CH-34A Choctaw

Developed in 1954 as a multirole helicopter. Known as H-34A Choctaw by the U.S. Army, HUS-1 in the U.S. Marines, and HSS-1 in the U.S. Navy as an ASW helicopter.

Overview

Data on design, manufacture and status

Design authority: Sikorsky Aircraft Corp.

Primary manufacturer: Sikorsky Aircraft Corp.

Parent type: Sikorsky S-58/H-34

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 (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:	4.85 m	15.9 ft
Overall Length:	20.03 m	65.7 ft
Overall Width:	17.07 m	56.0 ft

Airframe Dimensions
Airframe Length:	13.46 m	44.2 ft
Airframe Width:	3.89 m	12.8 ft
Airframe Height:	4.37 m	14.3 ft

Landing Gear Dimensions
Landing Gear Base:	4.27 m	14.0 ft
Landing Gear Track:

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

Cruise Speed: 97 mph (156 km/h)

Weights
Max Gross Weight (ground):	6,350 kg	13,999 lb
Max Gross Weight (airborne):
Max Take-off Weight:	6,350 kg	13,999 lb
Empty Weight:	3,583 kg	7,899 lb

Climb Performance
Max Rate of Climb:	6 m/s	1,099 fpm

Hover Performance
Hover Ceiling IGE:	1,494 m	4,900 ft
Hover Ceiling OGE:

Limitations
Max Level Flight Speed:	196 km/h	106 kts
Never Exceed Speed:
Service Ceiling:	2,896 m	9,501 ft

Range and Endurance
Max Range:	293 km	158 nm
Max Endurance:

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

Powerplant
Number of engines:	1
Designation:	Wright R-1820-84 reciprocating
Manufacturer:	Wright Aeronautical Division, Curtiss-Wright Corporation

Normal Ratings
Max continuous:	1137 kW	1524 hp
Take-off / rated:
Intermediate:
Maximum:

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

Foldable main rotor.

Main Rotor Characteristics
Diameter:	17.07 m	56.00 ft
RPM:
Direction of Rotation:	Counterclockwise
Hub Type:

Main Rotor Blade Characteristics
Blade Construction:	NACA 0012 airfoil
Blade Chord:	0.416 m	1.37 ft
Blade Tip Geometry:
Blade Twist:	-0.140 rad	-8.000 deg
Number of Blades:	4

Main Rotor Derived Characteristics
Disc Area:	228.85 m²	2463.4 ft²
Disc Loading:	27.75 kg/m²	5.683 lb/ft²
Solidity:	0.0621

Main Rotor Blade Derived Characteristics
Blade area per blade:	3.55 m²	38.3 ft²
Tip Speed:

Tail Rotor Characteristics
Diameter:	2.67 m	8.75 ft
Configuration:	Pusher
Direction of Rotation:	Top blade fwd
RPM:

Tail Rotor Blade Characteristics
Number of Blades:	4
Blade Construction:	NACA 0012 airfoil
Blade Chord:
Blade Twist:

Tail Rotor Derived Characteristics
Disc Area:	5.59 m²	60.1 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 385)
Book

Rocky's Ready Reference

Arthur Niedzielski
Sikorsky Flight Test Center, July 22, 2016
Report or Technical Manual

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

Vinny Devine
Sikorsky Archives | Product History, Sep 19, 2017 (page 18)
Website
Very thorugh description and details of the R-4 series helicopter

Sikorsky Archives | S-58

Sikorsky Archives, Vinny Devine
MARCH 11, 2014
Website

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Images

Overview

Attribution

Tail rotor

Attribution

Number of engines:	1 Reciprocating
Max Level Flight Speed:	196 km/h	106 kts
Max Range:	293 km	158 nm
Max Endurance:

Main Rotor Diameter:	17.07 m	56.00 ft
Max Gross Weight (ground):	6,350 kg	13,999 lb