An engine developing 45 kW at 1000 r.p.m is fitted with a cone clutch built inside the flywheel. The cone has a face angle of 12.5° and a maximum mean diameter of 500 mm. The coefficient of friction is 0.2. The normal pressure on the clutch face is not to exceed 0.1 N/mm². Determine, (i) The axial spring force necessary to engage to clutch and (ii) The face width required.