This and image at bottom should give you a starting point for the 5-4 planshape. (Image at bottom is from the 5-4 link — click image to enlarge and copy/download.)
This board will change your perspective of what a twin fin is. User friendly speed, easy turns, and more waves without sacrificing performance. Approachable for any style of surfing. A board that you can really push on rail or just enjoy the...
Price: USD 1,200
Then play with these:
The image above was inserted into PowerPoint.
Below, it has been divided into 10 equal segments.
Measure image width at each interval. Divide each width by image length (width/length),
Let us say you want a 70-inch board. Multiply 70 inches by the width/length for each interval. That will be your width for every 7-inch interval.
[However, if you want a specific maximum width for a given length, you will have to play with (proportionally adjust) the width/length ratios:
Bluegrass Board Bu…