Minimum engine horsepower required, at a given speed, displacement and hull form?

I have found rule of thumbs for hull speed, but it seems to be for amateurs and is grossly incorrect.

V = 1.34 (LWL)^(1/2)

I've also found rule of thumbs for hp to displacement

1 hp to 450-500 lbs

I was wondering if there were more accurate ways to find the hp required for a certain design, if you were only given

a. Hull form
b. Speed required (in knots)
c. Displacement (in tonnes)

 

Nikezzm,

Go to this link,

http://www.boatdesign.net/forums/boat-design/center-flotation-calculation-implications-30857-18.html

and to post #264 to download "The Design Ratios", which we discussed on this forum earlier this year. This document of the sum of all my "lecture" posts on that thread. In chapter 4 and in chapters 11 and 12 I discuss the speed/length ratio and the various speed prediction equations.

Eric

 

Thank you very much.