continuousWave --> Whaler --> Reference

Crouch's Speed Calculator

Presenting a calculator for determining speed potential based on a hull's weight, its engine's horsepower, and a "hull factor" constant.

Planing Hull Speed Calculator

Calculator implemented in Perl by James F. Hebert.
Weight Power Hull Factor Boat Speed
 LBS  HP   MPH
Hull Speed Calculator

This calculator is based on a formula developed by Naval Architect George Crouch who showed that a useful estimate of the speed of a moderate planing hull could be derived from the boat's weight, horsepower, and hull factor. The variables are related by


MPH = [  ( HP / LBS )^0.5 ] x C

where C = a constant ("hull factor") that depends on the hull form.

Crouch proposed that C would have a value for various hull types as follows

PLANING HULL SPEED CONSTANTS--MPH

C      Hull Type

172    Average runabout, cruiser, passenger vessel
218    High-speed runabout, very light high-speed cruiser
240    Race boat types
253    Three-point hydroplanes, stepped hydroplanes
265    Racing power catamarans and sea sleds

The hull factor is a constant which is used to convert the necessary dimension. Most Boston Whaler hulls are in the range of 180 to 200,

COMMENTS OR QUESTIONS

If you have a comment or question about this article, please append it to the discussion which has been created for that purpose.