I put this together off-forum a few weeks ago for *SurferO* using a Lis Fish (Kinstle, 1977) to illustrate. Perhaps a few members/visitors might be interested. Let us see what happens.

To re-size a full-size template, first divide desired length or width by original template length or width, respectively.

[Dimensions shown in all figures below are those of the original figure (Kinstle, 1977) and have not been re-labeled to show the increases or decreases discussed.]

In this example, the objective is to increase template/surfboard width from 21" to 23". Divide 23" by 21". This gives you 1.095. The measured widths of the Lis Fish template below (Figure 1) are at 12" intervals. Now multiply each of these widths by 1.095 and you have the new widths for the same 12" intervals. To decrease template width from 21" to 19", divide 19" by 21". This gives you 0.905. Now multiply the original widths by 0.905 and you have the new narrower widths for each of the original 12" intervals. For either, plot and connect these new width points with a smooth, continuous curve. You could use the old template or a flexible strip/batten to draw the curved outline.

**Fig 1. Lis Fish template: original width (21 inches), wider (23 inches) and narrower (19 inches). All three are the same length.**

To increase template length from 65" to 74", divide the new length (74”) by the original template length (65"), 74/65 = 1.138. The original template widths will now be placed at 13.66" intervals (1.138 x 12") instead of the original 12" intervals. To decrease length to 56", divide the new length by the original length (56/65 = 0.862). Now place the old template widths at 10.34" intervals (0.862 x 12") instead of the original 12" intervals. Again, plot the points and connect them with a smooth, continuous curve (Figure 2).

**Fig 2. Lis Fish template: original length (65-inch), longer (74-inch) and shorter (56-inch). All three are the same width.**

To improve nose and tail shape resolution, you can measure template widths at 1-inch intervals for several inches (Figure 3) – starting measurements from the template tips (nose and tail). Similarly, rather than using 12-inch intervals to measure the original template widths, you could use 2- to 3-inch intervals. Whatever length interval suits you. The closer together the width measurements are, the better the shape resolution will be overall. These new intervals will be increased or reduced to increase or decrease template dimensions using the same method described above.

**Figure 3. Steve Lis Fish**

Kinstle, J.F. 1977. *Surfboard Design and Construction,* p. 61. Published by Natural High Express Publishing, Long Beach, CA.