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The front of the 2nd stage turbine shaft
carries a specially contoured hardened
and ground spiral bevel gear which
meshes to a sintered high strength spiral bevel crown wheel. The
input shaft is carried on two high precision ceramic high speed
bearings with a light preload. The bearings are lubricated with fuel
exiting from the gearbox area. The reduction ration is 4.285:1 and
the gear assembly is safe to run to 20,000rpm output speed and
85,700rpm input. Normal maximum speed of this shaft plus clutch
and fan would be 15,000rpm and remember most tail rotor assemblies are speed rated for this rpm
so take extra care here.