all up she's about 25 tons, and the engine has 380 hours on it, and starts an runs like new
I used http://www.castlemarine.co.uk/pitch.htm and bashed some numbers in and got an estimated hull speed of 8.5knots and a diameter/pitch figure, but I'm not convinced of my own abilities with the science of it all
fundamentally though, I feel there's something along the way that's not right, maybe its the old kelvin prop still, which is so big its holding her revs back, or the engine is governed to keep it back for some other reason?
need to get her hauled at as soon as we can to see what she's swinging down there and then do some more head scratching (an no doubt cheque book stretching) and get some one who knows what they are looking for to see if she does have a governor on the lump. As well as everything else she burnt a hell of a lot more diesel than I'd expected at 1500 revs on the trip back.
one mad alternative that presented itself today was the possibility of pulling the new fordy/borg warner box out and sticking a big old kelvin lump/box back in! Maybe flogging the fordy and box would pay for the kelvin to go back in!
logically that probably is an insane thing to do, but you know what, I can here that clickety clackety sound already!
historically, from the family that owned her way back when she was kelvin powered, they would get around 9knots from her (10 with a good shove from the tide) So the old girls has it in her somewhere along the lines
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Converting a Converted MFV Fifie.
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Re: any prop calc boffins out there??
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