The linked calculator is for planing hulls - not accurate for a displacement hull. As stated earlier power for a slender displacement hull is well approximated by cube of speed.
On 20/03/2015, at 1:19 AM, "taladorwood@yahoo.com.au [harryproa]" <harryproa@yahoogroups.com.au> wrote:
This is a site to determine hp for hull speed that I have found to be quite accurate. http://continuouswave.com/cgi-bin/crouchcalc.pl
Using a weight per hull of 7500 lbs, hull factor of 250 and a speed of 5 mph the hp required is 3 hp. One hp is roughly 750 watts. So to move a Proa 5 mph requires 6 hp (two hulls) or 4.5 KW.To go 8 knots (9.2 mph) requires 10.2 hp per hull or 15 KW's total.
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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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