Linjett 40 data

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×S.A. / Displacement Formula
SA/D = SA (ft²) ÷ [Disp (lbs) / 64]^
A sail area/displacement ratio below 16 would be considered under powered; 16 to 20 would indicate reasonably good performance; above 20 suggests relatively high performance.

×Ballast / Displacement Formula
Bal./Disp = ballast (lbs)/ displacement (lbs)*
A Ballast/Displacement ratio of 40 or more translates into a stiffer, more powerful boat that will be better able to stand up to the wind.

×Displacement / Length (LWL) Formula
D/L = (Disp / ) / ( × LWL)^3
The lower a boat’s Displacement/Length (LWL) ratio, the less power it takes to drive the boat to its nominal hull speed.
less than = Ultralight; = Light; = Moderate; = Heavy; + = Ultraheavy;

×Comfort Ratio Formula
Comfort ratio = Displacement ÷ ( × (.7 × LWL + .3 × LOA) × Beam^)
This is a ratio created by Ted Brewer as a measure of motion comfort. It provides a reasonable comparison between yachts of similar size and type. It is based on the fact that the faster the motion the more upsetting it is to the average person. Consider, though, that the typical summertime coastal cruiser will rarely encounter the wind and s