Exam Question

With respect to Ship Propulsion:

(a) Explain the various efficiencies associated with propeller and shafting arrangement. (6)

(b) When a propeller of 4.8 m pitch turns at 110 rpm, the apparent slip is found to be -S % and the real slip is 1.5 S %. If the wake speed is 25% of the ship speed, calculate the ship speed, apparent slip and the real slip.