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Now...for the lazy:
These templates have been passed around for many years, and I have no idea who was the originator:
[URL="Bdd-chasses.pdf"Scale templates[/URL]
The collected scale designs are...

There are program plug_in's or separate programs which will take a scanned scale or blade profile and convert it to the drafting/ drawing software you have. They are usually a PDF format
There you...

Just an addition to a great idea.
You can make multiples of a blade shape along the paper and sketch different scale designs.
My scanner is more accurate if I go crosswise. I can then use the...