Q6. With reference to tunnel type bow thrusters:
(a) explain why some vessels are fitted with more than one bow thruster; (2)
(b) discuss the options available in terms of prime mover and transmission systems. (8)
Q3. With reference to podded thrusters for main propulsion:
(a) distinguish between podded and azimuthing thrusters; (4)
(b) explain the meaning of thruster and tractor propellers, stating ONE advantage of tractor units; (4)
(c) explain what is meant by tandem podded thrusters. (2)
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