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

[Adam]

Any old motor, engine, strong wind, will move a trawler at close to hull 
speed in calm water.  In the crunch with wind and current opposed and 
surrounded by expensive mega-yachts in a small marina, it is nice to 
have plenty of power.  I have (tried to) handled underpowered boats in 
strong winds and it's not pretty.

Adam

Arild Jensen wrote:
>> -----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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