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2000 3500 open with 7.4L 350hp - general questions
#8
(10-19-2020, 06:07 PM)Misdirection Wrote: WOT should be in the 4400 to 4600 range and the top end a little higher than their suggestion.  But if they didnt run the boat to WOT, their just guessing.  

However, if they didnt run the boat up to 3200 to 3400, which should be the optimal cruise, I'd ask why not and insist that they go back out and run it to there, and up to WOT if the conditions permitted it.

Sent from my SM-A505U using Tapatalk

Thanks, My dad said they ran it up WOT or what they thought was WOT.  The boat was full of fuel, has an inflatable on a davit system on the swim platform as well as a 3000 watt generator on the platform (so probably 400-500 pounds I would guess).  

I am sure they ran through the 3000-3400 range but my dad mostly noticed that there was a big step up in speed between 1700-1800 rpm (at 14 knots) to 2100 rpm (at 17-18 knots).  I am guessing my father will be much more interested in cruising at 18-19 knots then 22-23 knots.  

Another thing the surveyor said was that the props seemed small (so not overpropped) but seemed to have more pitch and were cupped.  The surveyor expected the props to be more square (ex: 17x17 although I am making up that number) but these must have had a higher pitch.  

I have let him know that 4200 seems a little low for WOT.  Sounds like he is planning on buying it but would be nice to find the right props eventually.  It doesn't sound like things are so out of whack that it is likely they caused harm.
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RE: 2000 3500 open with 7.4L 350hp - general questions - by polarbill1999 - 10-19-2020, 06:46 PM

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