[PCW] powering my cat

[Truelove39 at aol.com]

Hi  Alexander -
 
Interesting  to read of your desire for more speed just as many on the 
trawler list are  moaning about the cost of Diesel, which seems to be headed towards 
US$10. per US  gallon. 
 
I  predict that unless the cost of Diesel stabilizes, cats will return to 
their  original form, one with a mast and two small engines. But then, I have  
always wondered why anyone would want to eliminate the mast, bridges  
notwithstanding. 
 
Regards,
 
John
"Seahorse"

Dear friends
My new power cat is a trawler cat Highland 35 from  Fountaine Pajot weighting
6tn and powered with the maximum horse power  engines according to the factory
i.e Volvo D3 110hp at 3000 rpm. With these  engines I get 19kn at WOT and
15-16kn cruising speed. Although is a semi  planning boat I am thinking to
replace the engines with the D3 160hp which  have the same weight, the same
dimensions but 50hp higher power at 4000rpm.  How much increase in both 
maximum
and cruising speed do you think that this  change is going to obtain? Should I
modify the propelers as well?
Alex





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