BartW
Well-Known Member
yes, that was the one, I didn't save the link,
New purchase agreed - Surveyor Recommendations in SoF please
- Thread starter markc
- Start date
yes, that was the one, I didn't save the link,
markc
Well-Known Member
Thanks for the recommendations everyone, on here and via PM. All surveyors and cranes are understandably very busy at this time of year, so I seem to have managed to organise sea trial and equipment survey for the 24th April, and a lift for the 5th May to check hull & running gear. This is the company that I'm planning on using (sadly the reccomended ones from here were all busy) http://www.expertsmaritimes.fr/ .I'm keeping fingers crossed and if anyone's interested, I can start a thread on the survey outcome.
MapisM
Well-Known Member
Am I understanding correctly that the boat is now in the water, and you will have the seatrial before lifting, hence with no chance to powerwash her?
Careful there, because unless you are 100% sure that the boat is already perfectly clean, you (as well as any surveyor or engineer, no matter how good) will have no way to tell if any failure to reach the rated engine rpm is due to some problem in the engine/transmission/propulsion chain, or just to fouling.
I have first hand experience of a boat which should have reached 24 kts @ 2300, but was barely able to touch 18 kts @ 2000 due to fouling - which didn't even look too bad, btw.
Besides, insisting to run at WOT with a fouled boat and no EGT gauges (as is the case with those MTU engines, unless retrofitted afterwards) is even somewhat risky, because the engines can run in an overloaded condition under their rated rpm, which can mean a very high EGT, potentially damaging the engines/exhaust...! :ambivalence:
markc
Well-Known Member
Yes, I do agree under normal circumstances and I am prepared for the boat to not perform as it will be undoubtedly fouled. However, the boat has recently had the engines out & overhauled and I have all the bench tests plus the recommissioning sea trial results from MTU plus diesel analysis, oil analysis, detailed prop measurements and the boat has run for less than 50 hours since all this was done. I think I'm quite relaxed on the engine front...
MapisM
Well-Known Member
Wow, that's much more evidence than you would have when purchasing a brand new boat! :encouragement:
Just wondering, though: why is the owner selling to start with, if you don't mind me asking?
It's never worth making such extensive refitting just in the hope to get your money back upon resale...
Just wondering, though: why is the owner selling to start with, if you don't mind me asking?
It's never worth making such extensive refitting just in the hope to get your money back upon resale...
markc
Well-Known Member
it's a long story!
Portofino
Well-Known Member
I think with bigger engines correctly matched and the correctly propped ** they just spin up regardless of fouling ,you just lose speed , or burn more fuel to settle at a cruise ,that with a clean set up would ave been a100 rpm lower or so .
That's what I find .
Sure % load goes up for that same speed "dirty " compared to clean .
I ,ve Allways said this it the Real World Speed --RWS that counts .
RWS is in my view more important than any factory stuff ,with 1/2 tanks ,no tender , no stores , no accumulated crap , new shiney clean props n hull .
In fact Sunseeker are quite cheeky in this ,they launch and test an un antifouled new boat ,also do the weeps n leaks test -sometimes for 3 months while the final fit out like the punters B and O hi fi is fitted etc .
Then it's lifted taken in to the "finishing shed " antifouled and made ready for the del to the punter .
Imagine benchmarking one of those in a sea trail 10-15 y later ??
It needs to sit in Zone all day long what ever that is -- these are old boats .As long a WOT is done for say 15 mins and no rapid movement of the guages -then all should be fine .
How -ever in this example it does seem in excellent nick engine wise .
My boat max rpm is 2150 ( longer stroke compared to the V8'and 12,s ) which it does when asked ,but I can not remember the last time I wot ed it tbh ?
Rarely go over 2000 rpm --- 1850 is way well N of 30 knots .
Broker /ex Itama dealer and the del skipper said set it at 1650-1750 --- sits there all day 28 knots Eco cruise 82 degree water temp even in August load 80 something % ,EGT,s 525 degree iirc ?
They might send a diver in to clean up the props
I asked if I could WOT mine at sea trail -no problem they said
I offered to sub them for the fuel -- we were out for about a hour in all --- they did not want any re -imbersment .
Skipper took me round ,we looked under every floor pannal and poked around a cold engine room before we went out .
Repeated the inspections after the trail
** thing is if the engines are on the edge so to speak in spec /Hp /Kg,s of the boat ,then any extra Kg or fouling --sure they will overload or the whole set up have a tendency to overload .
Excess EGT is the real marine diesel killer
It does not go up a lot with fouling a bit on my boat ,because as mentioned the Hp /Kg,s /props have been carefully matched -- props eventually self clean after a good blast --although I can and do snorkel clean them so save fuel --I think
Ideally if it can sit @1800 - 1850. All day --then all with what I've said -- it's a good un .
If it needs 2000 rpm + or worse 2100 -to reach a decent cruise -walk away ---- you gonna kill it and you are at the wrong end of the consuption graph ,the bit we're it gets v steep
That's what I find .
Sure % load goes up for that same speed "dirty " compared to clean .
I ,ve Allways said this it the Real World Speed --RWS that counts .
RWS is in my view more important than any factory stuff ,with 1/2 tanks ,no tender , no stores , no accumulated crap , new shiney clean props n hull .
In fact Sunseeker are quite cheeky in this ,they launch and test an un antifouled new boat ,also do the weeps n leaks test -sometimes for 3 months while the final fit out like the punters B and O hi fi is fitted etc .
Then it's lifted taken in to the "finishing shed " antifouled and made ready for the del to the punter .
Imagine benchmarking one of those in a sea trail 10-15 y later ??
It needs to sit in Zone all day long what ever that is -- these are old boats .As long a WOT is done for say 15 mins and no rapid movement of the guages -then all should be fine .
How -ever in this example it does seem in excellent nick engine wise .
My boat max rpm is 2150 ( longer stroke compared to the V8'and 12,s ) which it does when asked ,but I can not remember the last time I wot ed it tbh ?
Rarely go over 2000 rpm --- 1850 is way well N of 30 knots .
Broker /ex Itama dealer and the del skipper said set it at 1650-1750 --- sits there all day 28 knots Eco cruise 82 degree water temp even in August load 80 something % ,EGT,s 525 degree iirc ?
They might send a diver in to clean up the props
I asked if I could WOT mine at sea trail -no problem they said
I offered to sub them for the fuel -- we were out for about a hour in all --- they did not want any re -imbersment .
Skipper took me round ,we looked under every floor pannal and poked around a cold engine room before we went out .
Repeated the inspections after the trail
** thing is if the engines are on the edge so to speak in spec /Hp /Kg,s of the boat ,then any extra Kg or fouling --sure they will overload or the whole set up have a tendency to overload .
Excess EGT is the real marine diesel killer
It does not go up a lot with fouling a bit on my boat ,because as mentioned the Hp /Kg,s /props have been carefully matched -- props eventually self clean after a good blast --although I can and do snorkel clean them so save fuel --I think
Ideally if it can sit @1800 - 1850. All day --then all with what I've said -- it's a good un .
If it needs 2000 rpm + or worse 2100 -to reach a decent cruise -walk away ---- you gonna kill it and you are at the wrong end of the consuption graph ,the bit we're it gets v steep
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