A multiple disk, wet (running in oil) clutch is required for a motorcycle. The power demand is 80 kW at 11000 rpm (rev/

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A multiple disk, wet (running in oil) clutch is required for a
motorcycle. The power demand is 80 kW at 11000 rpm
(rev/min). Calculate the outer radius ro (in mm)
if riro =0.6, the service factor
is 2.9, the lining material has a coefficient of
friction of 0.07 and maximum (allowable) contact pressure of 0.69
MN/m2 (= MPa) and the clutch has 10 plates (i.e. N
= 20 contact surfaces). Use the uniform wear assumption.