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Anonymous
Most of the /po/eple here use 3D software to make their paper models, and if you want to do this by hand, it is possible to calaculate everything exactly, but it's kinda difficult. So what I usually do is the trial and error method. Make a horizontal crossection of the base of your red part. It's best to do this out of thick carton (and it's useful to draw on a cross so you can work symmetrical a little. It will be a little like an oval. Then take a strip of paper and tape it to the front and the back of this oval, in the middel, so that it forms an arc that follows the shape of the highest curve on your helmet. Make another strip of paper, only this one needs to be a little curved. You don't know exactly how much exatly, though: approximate it with your best guess, then hold it against the first strip in an arc that looks about right. Trace the line where the first strip of paper and this second one touch to trim off the excess. Repeat this process untill you make half of the helmet (the other side you can mirror after you scan in the parts/strips). The further you go, the more the strips will start to look like "C" shapes. The extra little curve makes it more difficult a little but it can be done with this method. You just need to make temporary reinforcements inside your "mold" so the first strips holds that shape. It can be a lot of work, and you'll be cutting and recutting strips many times, but if you're patient and work very neatly, you can really create very nice curved shapes with this trial and error method.
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