Instructions:

  • Enter your data in the form.
  • Try to use accurate information, the results are only as good as the data you enter.
  • The vast majority of planing hulls have a constant "C" value of 150, or just slightly above.
  • Press the calculate button to display the results.
  • Using the browser "back" button from the results page will allow you to change individual items without having to re-enter everything again.

 

  Planing Hull Calculation

Waterline length of vessel Feet
Beam at the waterline Feet
Hull draft Feet
Vessel weight lbs
Number of engines
Maximum horsepower of each engine HP
Maximum engine R.P.M. RPM
Gear ratio : 1
Number of shaft bearings between the gear box and the propeller.
Enter Constant "C"
(based on table below)
Type of Boat:
Average runabouts, & cruisers
High speed runabouts, very light high speed cruisers
Race type boats

C:
150
190
210

Desired maximum speed
(calculations will show maximum speed based on available HP, and required HP to attain your desired speed)
Knots

1 knot = 1.15 mile per hour


 
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