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Encyclopedia - MBB/Kawasaki BK117

The BK 117 is an eight-seat, twin engined medium utility multi-role helicopter, utilizing a four-bladed hinge less main rotor system with fibre-reinforced composite blades, and a semi-rigid, two-bladed tail rotor. Development was a joint effort by German Messerschmitt-Bölkow-Blohm (MBB), which based a lot of the design on the popular BO 105, and Japanese Kawasaki. MBB eventually became a part of Eurocopter. The BK 117 can seat up to 10 people and is used in a number of utility roles such as law enforcement, sling loads and military transport, but is probably most known as an exceptional air ambulance and search and rescue platform. The helicopter is powered by two Lycoming LTS 101-750-B1 turbo shaft engines of the free turbine type. The engine power is transmitted to the transmission via independent drive systems. The twin-engine reliability is complemented by a fully-separated fuel system, a tandem hydraulic system, dual electric systems and a redundant lubrication system for the main transmission.

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MBB/Kawasaki BK 117-A1


Country of Origin : Germany and Japan


Number Of Engines : Two
Powerplant type : Avco Lycoming LTS 101-650B-1 turboshaft engine
Max Power Rating : 410kW (550shp)


Length, Rotors Turning : 13.00m (42ft 8in)
Height : 3.83m (12ft 7in)
Main Rotor Diameter : 11.00m (36ft 1in) Rigid 4-bladed main rotor, rotor blades made from fibre-reinforced plastic
Main Rotor Disc Area : 95.03m2 (1,022sq ft)


Empty Weight : 1,650kg (3,637lb)
Max Take-off Weight : 2,850kg (6,283lb)


Max Speed At Sea Level : 135kt (250km/h; 155mph)
Maximum Range : 270nm (500km; 311mi)
Service Ceiling : 15,000ft (4,570m)

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