Instructions
Measure your own height in inches and add four to six inches to this height.
Divide the total height (with the added inches) by 86. The result should be a decimal number.
Take the number and multiply it by the current scale of your helmet. The most common scale for Pepakura is 31.9.
Navigate to "Pepakura Designer" and then open the file of your helmet. Select "Scale" and then "Scale Factor."
Enter the number you calculated into the "Scale" box. When assembled, your helmet should fit to your height specifications.