The pump and motor are the same units. Both being Cross MA series with aluminium bodies and weighing 3.2kg each. The dimensions about 5inches long and 8 inches across. One is attached to by a Taper Lock coupling to a 1 inch shaft which is 12 inches long and it was attached directly to the flywheel mounting bolts with a flange and spigot. Also on this shaft between the pump and engine flywheel is A section pulleys to drive the alternators and a Jabsco pump which has a clutch. This is used as a deck wash pump and a fire fighting unit which thankfully never got used for the latter. The pump can draw water straight from the sea or could have its inlet switched by valves to pump the hull bilges. The engine has its own alternator and battery set-up as normal but also another Jabsco pump is run off what used to be the aircon drive pulley this supplied sea water for the engine and hydraulic intercoolers. The whole power assembly is mounted by rubber mounts on a rigid aluminium frame which is bolted over the centre beam in the middle of the boat. The lot has a sound proofed box over it and the top is a handy table top. A fibreglass tray is under the engine to catch any oil or fuel.2 60 litre fuel tanks fed the engine. I never really tried to see what range I could get because I prefer to use the sails but I didn't top up very often. With 3000 rpm I could get 10 to 12 knots in good conditions. I used a standard auto exhaust system made of stainless and it run under the deck and outlet under beam 5.There was very little vibration when engine was running and a bit at idle. The alternators could completely charge my batteries after running for 30 minutes at 2000 rpm. An aluminium tank held 70 litres of hydraulic oil. Heavy section aluminium pipes transferred the hydraulic oil to and from the hydraulic motor, with flexible hoses on the ends. With the motor being the same as the pump the drive was 1:1 ratio and very small transmission loses. Forward and reverse is controlled by a single spool valve with detent and prop speed controlled by engine revs. The whole lot is heavy and I think a bit of an overkill on the 35 footer but It never really caused any problems. The sketches show roughly how I made the motor/prop assembly. The outboard parts were of an Evinrude 140 HP. I used a 17 inch pitch prop. The hydraulic motor attached to the outboard drive shaft by Taperlock coupling. A small boat trailer winch was used to lift the leg clear when sailing. I had a Whitlock 30 inch steering wheel which fitted on top of the steering shaft for tight manoeuvring but usually locked the leg straight ahead and used rudder control. The steerable leg was handy when putting the boat in my pen or to steer around and free a stuck anchor. I did intend to connect a hydraulic steering as well but didn't get around to it.