1.3.‘Froude number’ Fn shall be calculated by dividing the maximum recreational craft speed V (m/s) by the square root of the waterline length lwl (m) multiplied by a given gravitational acceleration constant, g, of 9,8 m/s2.
‘Power to Displacement ratio’ shall be calculated by dividing the rated engine power PN (in kW) by the recreational craft’s displacement D (in tonnes)
