this is the latest iteration from our cad man
he has pasted in an outline of a long shaft Tohatsu into an accurate scale of the back end of a Centaur - looks pretty good to me. In fact, the way everything is falling into place anyone might have thought that old Jack Laurent Giles made the dimensions to fit just right.
this is great news because ebay and boats and outboards have scores on offer of all conditions. It means that I can afford to buy an older one and use my good Tohatsu as a back up. I am hoping that we can try a 6hp, a 10hp and a fifteen. I have a contact who has an Achilles 24 and he runs it with a 4hp long shaft - he says it goes beautifully
So - I think we have the shape for the bulkhead and clamp lip sorted.
I am now thinking about the best way of creating the part where the well meets the cockpit floor
Just to to remind you here is the well and cockpit more or less to scale - and yes it is wider than it is long - see previous posts for why.
the clamp lip is the final barrier before water hits the cockpit. It is eight inches abover the waterline - the same as an Achilles 24. I am not bothered about water slopping around the cockpit behind the clamp as that is all part of the well.
I am thinking of bolting the well sides firmly to the stout cockpit floor so that there is no lip. Bolts will be passed through the hardwood (yes hardwood chaps) 4cm x 4cm joining sections vertically into the cockpit floor and horizontally into the 18mm side of the well. I will then get the man from Wessex resins to put epoxy and cloth right around the lip. I am not bothered about the way it looks - I want it to be well stuck together. Then I will make a removale U shaped collar which will just slot into place around the engine - made of ply and the 4cm x 4cm joiners. It will just drop into place when it is needed. I would expect that most of the time it would not be needed.
does this make sense. I think that the achilles well is the best pattern so far. Similar size boat, similar depth of well.