Vertipedia - Kaman K-190

Developed in 1948, the K-190 is a 3-place continuation of the K-125 prototype. Equipped with a rudder on the tail fin. Behind the pilot is a bench that is supposed to accomodate an additional two passengers [Ref 316]. The synchrocopter was commonly used for crop dusting.

Overview

Data on design, manufacture and status

Design authority: Kaman Aircraft Corporation

Primary manufacturer: Kaman Aircraft Corporation

Parent type: Kaman K-225

Aircraft status: No longer flying

Configuration

Primary flight and mechanical characteristics

VTOL type: Helicopter

Lift devices: 2 in Synchropter configuration

Crew required: 1 in Single seater 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

Overall Dimensions
Overall Height:
Overall Length:
Overall Width:

Airframe Dimensions
Airframe Length:
Airframe Width:
Airframe Height:

Landing Gear Dimensions
Landing Gear Base:
Landing Gear Track:

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

Cruise Speed: 65 mph (104.607 km/h)

Weights
Max Gross Weight (ground):	1,134 kg	2,500 lb
Max Gross Weight (airborne):
Max Take-off Weight:	1,134 kg	2,500 lb
Empty Weight:	771 kg	1,700 lb
Useful Load:	363 kg	800 lb
Empty Weight Fraction:	0.680

Climb Performance
Max Rate of Climb:

Hover Performance
Hover Ceiling IGE:
Hover Ceiling OGE:

Limitations
Max Level Flight Speed:
Never Exceed Speed:
Service Ceiling:	3,353 m	11,001 ft

Range and Endurance
Max Range:	378 km	204 nm
Max Endurance:

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

Powerplant
Number of engines:	1
Designation:	Lycoming O-435-A reciprocating
Manufacturer:	Lycoming Engines

Normal Ratings
Max continuous:
Take-off / rated:	142 kW	190 hp
Intermediate:
Maximum:

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

Main Rotor Characteristics
Diameter:	11.58 m	38.00 ft
RPM:
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:	105.36 m²	1134.2 ft²
Disc Loading:	5.38 kg/m²	1.102 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 314)
Book

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

Vinny Devine
Sikorsky Archives | Product History, Sep 19, 2017 (page 3)
Website
Very thorugh description and details of the R-4 series helicopter

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Number of engines:	1 Reciprocating
Max Level Flight Speed:
Max Range:	378 km	204 nm
Max Endurance:

Main Rotor Diameter:	11.58 m	38.00 ft
Max Gross Weight (ground):	1,134 kg	2,500 lb
Useful Load (calculated):	363 kg	800 lb