The aircraft was serviced with of JP-4 centre of gravity at the time of the accident was from datum, which is forward of the main rotor hub centerline.
22.
Driven by a single-stage low pressure ( LP ) turbine, the single stage fan is an advanced snubberless design, with wide chord blades integral with the rotor hub.
23.
Because the main rotor blades are spinning, the swashplate is used to transmit three of the pilot's commands from the non-rotating fuselage to the rotating rotor hub and mainblades.
24.
With the nacelles pointing straight up in conversion mode at 90?the flight computers command the aircraft to fly like a helicopter, with cyclic forces being applied to a conventional swashplate at the rotor hub.
25.
Most important was the development of direct rotor control through cyclic pitch variation, achieved initially by tilting the rotor hub and subsequently by Raoul Hafner by the application of a spider mechanism that acted directly on each rotor blade.
26.
The earliest, and by far, least common design today, is the fully rigid rotor system; the blades are rigidly fixed to the rotor hub but made of a flexible material that allows some degree of flap.
27.
The rotor system has 75 % fewer parts than that of four-bladed articulated systems, and the improved yokes allow for weight saving with the elimination of all bearings, hinges, and vibration absorbers in the rotor hub.
28.
The OH-1 is powered by a pair of Mitsubishi TS1 turboshaft engines, equipped with composite main rotor with a bearingless rotor hub along with a Fenestron-type anti-torque tail rotor ( an enclosed tail-fan unit ).
29.
Most important was the development of direct rotor control through cyclic pitch variation, achieved initially by tilting the rotor hub and subsequently by the Austrian engineer Raoul Hafner, by the application of a spider mechanism that acted directly on each rotor blade.
30.
To lessen the loads, especially the rapid changes, the rotor hubs included a system of bearings that allow them to move forward or back in response to drag, and up and down in a flapping motion in response to changing speed.
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