i have a 6’6 x 19 1/2 template. i really like the outline. i want to size it up a bit to 7’2 x 21. can i get some pointers please. im pretty new to shaping, so everything helps thanks
Hi Groggy,
U could try this:

Figure out what the new nose and tail dimension are if the wide point is 21’’

Figure out where the wide point is on the original

Lay out nose and tail curve up to say 20’’ or so

Use a flexibel rod to lay down the curve in the middle and conect the dots
Good luck
If you ask an engeneer he would probably tell you to take as much width measurments and multiply them by the scaling precentage you're after to create the new outline. now talking in centimetres  218.44 / 198.12 = 1.1 aprox . this means in your case you should multiply every measurment by
1.1 ... btw , this also means that if you take numbers off the 1 foot and second foot marks than on the scaled up board
you should mark them on a (1 foot)x 1.1 and ( 2 foot)x1.1 . kapish?
now if you ask a shaper that already has tons of templates lying around he would tell you to scale up the main measurments ,
say  1 foot , 2 foot , max width , mark them on the new board and blend template curves to fit the pencil dots.
now it doesn't really matter how you do it as lond as you get a nice flowing sexy outline.
btw, I just scaled up a 5'7 fish into a 6'4 fish . did it both to the outline and rocker and it went out super!!
used a mixed method ala shapers/engeneer style.
good luck
lee
groggy
I've used the greg loehr method of scaling templates;
For every extra inch in length, add 1/8th inch to width
So, 6ft board to 6 foot 6" board = 6 extra inches in length so add 6/8th inch to width dimensions. Im pretty sure it works the other way also, for every inch less in length, reduce width by 1/8th inch
For rocker and thickness measurements I tend to use the 'direct scale' method.
So, change the boards dimensions to millimetres or centimetres, and divide the new length (say 6'6") by the old length (say 6') so: 195cm divided by 180cm = 1.08 and multiply all the rocker and thickness/foil dimensions by 1.08 to upscale.
Ive used these methods successfully; but best to mark out dimensions and confirm by eye etc etc!
Marty