Developed in 1952, the Kaman K-600 is a larger and more powerful version of the HTK-1.  The cabin has a capacity of 5 passengers, including the crew.  The U.S. Air Force designated it the H-43A (now known as HH-43A), equipping it for firefighting with a 1000 lb (450 kg) fire fighting kit and small skis [1].  Designation under the U.S. Marines is HOK-1 (now the OH-43D); under the U.S. Navy, it is HUK-1 (redesignated UH-43C).  The H-43 went into service in April 1958 and was the primary helicopter for firefighting and short range rescue during the Vietnam War [2,3].

Source 1:  Alex, Ralph P. "Helicopters from 'A to Z', Part III". American Helicopter Society Newsletter, Vol. 7, 1961. Page 4-5.

Source 2:  Moorman, Robert W. "Coming Full Circle". Vertiflite July/August 2015. Published by AHS International. Page 19.

Source 3:  Hirschberg, Michael. "The American Helicopter" (2000). Page 58.


Data on design, manufacture and status

Design authority: Kaman Aircraft Corporation

Primary manufacturer: Kaman Aircraft Corporation

Parent type: Kaman K-600/H-43

Aircraft status: No longer flying


Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift configuration: Synchropter (x2)

Crew required: 2

Crew seating: Side-by-side

Landing gear: Wheels (non-retractable)

Layout and Dimensions

Data on aircraft size

Overall Dimensions
Overall Height: 4.74 m 15.5 ft
Overall Length: 14.33 m 47.0 ft
Overall Width:  
Airframe Dimensions
Airframe Length: 7.62 m 25.0 ft
Airframe Width: 2.77 m 9.1 ft
Airframe Height: 3.81 m 12.5 ft
Landing Gear Dimensions
Landing Gear Base:  
Landing Gear Track:  
Cabin Dimensions
Cabin Internal Height:  
Cabin Internal Length:  
Cabin Internal Width:  

Weights and Performance

Data on aircraft weight and flight characteristics

Cruise Speed: 75 mph (121 km/h)

Max Gross Weight (ground): 3,084 kg 6,800 lb
Max Gross Weight (airborne):  
Max Take-off Weight: 3,084 kg 6,800 lb
Empty Weight: 1,833 kg 4,040 lb
Useful Load: 1,252 kg 2,760 lb
Empty Weight Fraction: 0.594
Climb Performance
Max Rate of Climb: 7 m/s 1,300 fpm
Hover Performance
Hover Ceiling IGE: 3,658 m 12,000 ft
Hover Ceiling OGE:  
Max Level Flight Speed: 167 km/h 90 kts
Never Exceed Speed:  
Service Ceiling: 5,486 m 18,000 ft
Range and Endurance
Max Range: 354 km 191 nm
Max Endurance:  

Engine Details

Aircraft powerplant (lift and/or propulsion)

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

Number of engines: 1
Designation: P&W R-1340-48 Wasp reciprocating
Manufacturer: Pratt & Whitney
Normal Ratings
Max continuous:  
Take-off / rated: 448 kW 600 hp
OEI Ratings
OEI contingency:  
OEI continuous:  
OEI 30-second:  
OEI intermediate:  

Primary Lift Device

Data on primary lift devices such as main rotors

Main Rotor Characteristics
Diameter: 14.33 m 47.00 ft
Direction of Rotation: Counter-rotating
Hub Type:
Main Rotor Blade Characteristics
Blade Construction: Solid Wood
Blade Chord:  
Blade Tip Geometry:
Blade Twist:  
Number of Blades: 2
Main Rotor Derived Characteristics
Disc Area: 161.18 m² 1735.0 ft²
Disc Loading: 9.57 kg/m² 1.960 lb/ft²
Main Rotor Blade Derived Characteristics
Blade area per blade:  
Tip Speed:  

Primary Control Device

Data on primary control devices such as tail rotors

Tail Rotor Characteristics
Configuration: Unknown
Direction of Rotation: Unknown
Tail Rotor Blade Characteristics
Number of Blades:  
Blade Construction: N/A
Blade Chord:  
Blade Twist:  
Tail Rotor Derived Characteristics
Disc Area:  
Tail Rotor Blade Derived Characteristics
Tip Speed:  
Blade Area (per blade):  

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