After making a few tarps using this method, I find the depth of the curve to be important for making a taut pitch. For those starting a tarp for the first time, its quite intimidating working with catcuts and I admit it's not perfect, but it will get you in the ballpark.
So, I apologize for listing the title as "perfect curves". One thing that the pipe method does do is make the catcuts on both sides more
consistent, although they're not true curves. My plastic pipe at 10' long can be bent to make curves with a depth of 4 or more feet - it's what I use to make the dory boat curve on my hammock socks. Me and math don't get along that well anymore,
, hence the plastic water pipe to help me along!
Cutting out cardboard templates that have a true parabolic curve would be a better solution and be more accurate.
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