T&T: HP ratingse versus hul speed ( was: get home options pros and cons)

[Bill Allen]

I was on a 49 defever with a pair of 375 3208's at over 3 times the standard 
hp for this boat it didn't even double the speed, what's the point? Bill
----- Original Message ----- 
From: "Arild Jensen" <elnav@telus.net>
To: "Chris Byer" <e2wedz902@sneakemail.com>; 
<trawlers-and-trawlering@lists.samurai.com>
Sent: Monday, November 13, 2006 12:47 PM
Subject: T&T: HP ratingse versus hul speed ( was: get home options pros and 
cons)


>> -----Original Message-----
>> From:  Chris Byer
>> You can see Ben's backup, at:
>> <http://idlewildexpedition.ca/pictures/033_July_2006/2006-07-2428.JPG>
>> Chris Byer
>
>
> REPLY
> Ah of course!!!
> I did see it; but not from the engineroom.  At the time it was moved to 
> the
> inflatable yacht tender.<VBG>
>
> For Ben's boat its perfect!  Doubt it would suffice for a tubby Nordhavn 
> or
> Grand banks.
> But that does raise a corollary question.
>
> Why is it the boat builders feel compelled to advertise ridiculous horse
> power ratings for their models.
>
> Looking at a typical displacement trawler, its obvious that the advertised
> horse power engine model is three or even four times as large as required 
> to
> move the boat at full hull speed.
> In fact if you use the formula from Skeene's Element of Yacht design; you
> find the exact numbers to prove that the engines are over sized for a 
> given
> hull size.
>
> cheers
> Arild
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