Chris_d
Well-known member
Having spent many years based on The Thames I did this trip many times en route to St. Kats and the sea. My first reaction to the story was actually related to how did Mr Skinner get a P67 through Hammersmith bridge (twice) which is 2 metres lower than Richmond. There is no doubt that time was an issue as getting enough height under Hammersmith needs careful balance with having enough water to get through the shallow section between Richmond lock and Kew.
Ditch crawling in a larger boat is a definite skill of its own with tight bridges being a particular skill. It's one of the rare times when you don't pussyfoot with the throttles. If you feel you're off line to go straight through you put on a lot of power astern to get her out against the flow behind you. Equally when you are lined up, as your bow enters you put a lot of power on! This is scary but your stern will drop by about a foot, maybe more on something like a P67 and gives you the critical extra clearance all ways round on the bridge.
You need to be comfortable with the boat and your skills but it does work.
I think Mr Skinner had done most of the work needed in planning the trip as he must have done the planning to get there and, eventually back with the difficult timings needed to avoid problems at the other points. Few would have the nerve to power a £2m boat through a bridge with several knots behind you but it is an known and effective way of doing it!
Got to agree all this talk of going backwards, using thrusters, speed of water over the rudder etc.... there is only one way to do this and it takes big sphericals.
Have spent a lifetime on rivers shooting bridges in a similar manner with all sorts of craft often with inches to spare, there is no easy safe way to do it, you need sufficent speed to maintain control
and use lots of power if its required. Which goes against the usual take it slow advice but if you don't think you can handle it you shouldn't cast off.