zing-it continuous loop lengths??

[A.Bottoms]

is there like a magic formula for figuring out the line lengths needed for a continuous loop

i would like to make 3, 3inch continuous loops for my tarp what lengths of rope will i need

Thanks,
A.bottoms

[1-Hung-Low]

Try this: http://www.youtube.com/watch?v=xcoKeXAwBZY

[Curlee]

I have had good luck with make the Berrys 25-30% of the total length of the rope.