Thank you Danny, andy1999 and roving. I was on course 18 got mumps and finished on 19 course. I had a crew on each Coastal Squadron, and was lucky enough to have a Master Engineer in all three crews, also on one a Master Navigator, and on one a Master Signaller. The engineers had all been in Bomber Command during the war and were VERY clued up on Engines and airframes. In the Shacks of course the engineers had their own station, in the Neptune’s they had to sit on a wooden stool in the cockpit entrance where all the electric circuit breakers were on a large panel, and in front of them, under a flap in the floor were the fuel cross feeds. The Hastings engineer had his own position and his own set of prop controls and throttles. The niggle at the back of ones mind on the Shackleton was the translation unit which was phosphor bronze. It sat on the prop shaft between the propellers. The prop shaft drove the front propellor and the translation unit “translated” the power to the rear one. The props had to be exercised every two hours to ensure that the prongs on the unit were lubricated. The unit had its lubricant sealed. If the unit failed, the props could not be feathered, the front one could, but the rear idled, got hot, and several Shacks were lost when the rear prop bearings caused a fire which set fire to the wing. It will be interesting to see how the Poseidon works in the RAF. We had twelve Shackleton Squadrons in the fifties and sixties!!