Found this line drawing of the Pintail, there 6 in total and each pair differed on top with the last two having hydraulic system for the deck machinery, which proved difficult to work as it all came of a single ring main system. Which meant if you were doing a heavy lift and another winch or capstan was used, then this directly affected the main winch speed and power. If you went into the engine room the CP propeller gearbox was bigger than the main engine. An when at sea if you began to punch a strong tidal stream or a heavy wind/sea the engineroom would ring the bridge to tell you to slow down as the engine was starting to overheat. But they were fantastic seaboats very comfortable to be in, sat off the Varne light for six hours in a SW 8to 9 Gale and only made half a mile over the ground, requested entry into Dover Harbour for shelter, refused because they said the harbour had poor holding ground but wait 4.5 hours and perhaps they could lock me into the inner harbour. Could not turn her because of all the heavy salvage gear in the hold and two Trinity House nav bouys on the main hatch. If any one says why was i there it was because I had 5 different forecasts when anchored in the downs the worst was SE 10 immanent from the RN forecasters so i acted on the least worse which was the BBB news.