Arc lengths for tarp
I just finished a hex tarp and used the string method....4mm climbing cord is quite rigid and has enough weight for this task...i cut a contactor trash bag into a long rectangle and taped it to the wall level w/floor. mark endponts & midpoint and select desired (arc depth)...approx 1" per linear foot is good. Pin ends and adjust sag from one end to get drop..pin in place at midpoint. Add pins along arc formed every 6" or so. Trace arc with bright sharpie pen. Since i used silver silnylon the arc trace was visible thru the material when laid underneath...simply retrace the arc onto the fabric after lining up the endpoints and pinning them. Attached are pics of arc guide, cat cuts & finished tarp..it came out quite nice...No Calculus is necessary for this project...just a steady hand!
Last edited by fortran42; 02-02-2013 at 20:17..
Reason: added text