(a) determine winch power(kW) and shaft diameter(mm) (b) what if sunk-key permissible shear stress 40MPa, and bearing stress: 110MPa determine sunk key width and height in mm unit. (calculate key length 1 = 1.5*d(shaft diameter from a) winch design winch velocity: 2.8m/s (drum diameter D=80cm) shaft diameter: let d (see the figure) force(weight) F= 15kN permissible shear stress for shaft: 35MPa winch efficiency: 80% W: tangential force to sink key W LL F D