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Boat Forum / Building / March 2006Advice required....Long or shortshaft??
I had been left a 15 foot speedboat when my uncle passed away that i decided to clean up and repair, but i knew nothing about it at all when i started to make repairs and get her ready to go back onto the water, anyway after many weekends of rubbing down, painting and cleaning in places i did not know a boat even had places she is ready to go onto the water............. and i still don't know who made her!! But i have come across a problem but i cant seem to find any sites that will provide an answer. How can i tell if this speedboat requires a long or shortshaft outboard?? Is there a measurement between the keel and mount that will give me the answer?? Any help greatfully recieved. TIA Paul Measure from the top of the transom (on which the outboard will sit) to the bottom of the boat (outside distance). If it's 15', it's for a short shaft motor. If it's 20" if for a long shaft motor. Rick PS ooops just realized your in the UK. What I gave you is U.S. inches. Not sure how they measure it over there. >I had been left a 15 foot speedboat when my uncle passed away that i decided >to clean up and repair, but i knew nothing about it at all when i started to [quoted text clipped - 16 lines] > >Paul I'm sure there will be a convertion table i can use somewhere on the web thanks for the help Paul > Measure from the top of the transom (on which the outboard will sit) > to the bottom of the boat (outside distance). If it's 15', it's for a [quoted text clipped - 28 lines] >> >>Paul "Conversion" even :-) > I'm sure there will be a convertion table i can use somewhere on the web > [quoted text clipped - 35 lines] >>> >>>Paul Right. The principle should be the same as far as I know. Top of the transom to the bottom. My guess, for a boat of that type and size, it'll be 15" or a close millimeter equivalent, but measure to be sure. You can adjust an outboard up or down a small amount to get the prop and cavitation plate to the right depth. They all need a bit of adjusment anyway. And with a jack plate, you can even mount a 25" shaft on a 15" transom without rebuilding the transom although it might (maybe) require some sort of transom reinforcement. Trying to put a 20" shaft motor on a 25" transom would call for transom surgery though. Rick >I'm sure there will be a convertion table i can use somewhere on the web PhantMan wrote: >> Measure from the top of the transom (on which the outboard will sit) >> to the bottom of the boat (outside distance). If it's 15', it's for a >> short shaft motor. If it's 20" if for a long shaft motor. >> Rick >> PS ooops just realized your in the UK. What I gave you is U.S. >> inches. Not sure how they measure it over there. >>>I had been left a 15 foot speedboat when my uncle passed away that i >>>decided [quoted text clipped - 20 lines] >>> >>>Paul 2.54 cm = 1 inch Set the cavitation plate even with the keel. You can then jack the motor up as much as two inches. Be sure to run the boat allot at each position to evaluate the handling! > Measure from the top of the transom (on which the outboard will sit) > to the bottom of the boat (outside distance). If it's 15', it's for a [quoted text clipped - 28 lines] >> >>Paul >2.54 cm = 1 inch Sooooo....standard transom/shaft measurments are 38.1 cm and 50.8cm?? Are UK boats and motors listed at that in the spec section of their literature? Just curious.... seems odd as a standard anything although I guess if they sell much to US customers, that's what it'd have to be. Rick Yes, the UK boat specs are the same but are expressed in SI units instead. Example: http://www.suzuki-marine.co.uk/motors/specs.php Brian D >>2.54 cm = 1 inch > [quoted text clipped - 5 lines] > > Rick aha! Thanks :-) >Yes, the UK boat specs are the same but are expressed in SI units instead. >Example: > http://www.suzuki-marine.co.uk/motors/specs.php PhantMan wrote >>Sooooo....standard transom/shaft measurments are 38.1 cm and 50.8cm?? >> Are UK boats and motors listed at that in the spec section of their >> literature? >> Just curious.... seems odd as a standard anything although I guess if >> they sell much to US customers, that's what it'd have to be. |
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