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The turbine helicopter Hughes 369 is a military prototype of the Hughes MD 500 Series. The 500 series features the capacity for five and an Allison 250-C20 turboshaft engine. The cruise speed is 125 knots (144 mph) and the maximum speed is 152 knots (175 mph). The empty weight is 1088 lb and the maximum takeoff weight is 2250 lb.