Hughes
H-6
Cayuse
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AH-6J Little Bird
Photo: Robert Deering 7/14/2014
 American Helicopter Museum
Brandywine Airport (OQN)
West Chester, Pennsylvania
The Hughes OH-6 Cayuse (nicknamed "Loach", after the requirement acronym LOH—Light Observation Helicopter) is a single-engine light helicopter with a four-bladed main rotor used for personnel transport, escort and attack missions, and observation. Hughes Helicopters also developed the Model 369 as a civilian helicopter, the Hughes Model 500, currently produced by MD Helicopters as the MD 500.

Variants
YOH-6A
Prototype version.
OH-6A
Light observation helicopter, powered by a 263 kW (317 shp) Allison T63-A5A turboshaft engine.
OH-6A NOTAR
Experimental version.
OH-6B
Re-engined version, powered by a 298 kW (420 shp) Allison T63-A-720 turboshaft engine.
OH-6C
Proposed version, powered by a 313.32 kW (400 shp) Allison 25-C20 turboshaft engine, fitted five rotor blades.
OH-6J
Light observation helicopter based on the OH-6A Cayuse for the JGSDF. Built by Kawasaki Heavy Industries under license in Japan.
OH-6D
Light observation, scout helicopter based on the Hughes Model 500D for the JGSDF. Built by Kawasaki Heavy Industries under license in Japan.
EH-6B
Special Operations electronic warfare, command post version.
MH-6B
Special Operations version.
TH-6B
A Navy derivative of the MD-369H, six McDonnell Douglas TH-6B Conversion-in-Lieu-of-Procurement aircraft are used as an integral part of the United States Naval Test Pilot School's test pilot training syllabus. The aircraft and associated instrumentation and avionics are used for the in-flight instruction and demonstration of flying qualities, performance and missions systems flight test techniques.
AH-6C
Modified OH-6A to carry weapons and operate as a light attack aircraft for the 160th SOAR(A).
MH-6C
Special Operations version.
SPECIFICATIONS: PERFORMANCE:
Rotor Span:  27 ft. 4 in (8.33 m) Maximum speed:  152 knots (175 mph, 282 km/h)
Length:  30 ft 10 in - 32 ft 2 in (9.4 m - 9.8 m) Cruising speed:  135 knots (155 mph, 250 km/h)
Height:  8 ft 6 in - 11 ft 2 in (2.6 m - 3.4 m) Range:  232 nm (430 km (267 mi))
Empty Weight:  1,975 lbs (896 kg) Service ceiling:  15,994 ft (4,875 m)
Gross Weight:  3,549 lbs (1,610 kg)  
Crew:  2
Engines:  1 × One Allison T63-A-5A or T63-A-700 turboshaft, 317 hp (236 kW)
Armament: 
  • Guns: Two M60 or M134 Minigun 7.62 mm machine guns; Two .50 cal (12.7 mm) MG pods
  • Rockets: Fourteen 2.75 in (70 mm) Hydra 70 rockets in two pods
  • Missiles: Four TOW missiles in two pods; Four Hellfire missiles in two pods
  
SOURCE:  Wikipedia