Make the edge cuts whatever looks good to you. Youngblood had a good
point about looking at what is loose on the flat tarp and then cutting
that out. Occam's razor in action - the simplest answer is usually the
On the ridgeline, several thoughts.
Don't cut out much. Maybe just a couple of inches. Using the
Youngblood "cut away what looks loose" concept, if you think about a
pitched tarp, and the loose stuff at the ridgeline, reaching up there
and pinching just a couple of inches would be enough to take out that
looseness. I took too much out of the center of mine and ended up with
too much sag in the ridgeline.
Not a personal poke at Brian or Jeff, but I think that the "optimal
pitch angle" thing is a red herring. At nearly any angle, taking a
couple of inches out of the center will result in a tighter pitch.
Full stop. Is there a perfect angle for a given amount of cut? Sure.
But it helps at every other angle as well. In my opinion, anyway.
Like Youngblood says, the seams start to look a little wrinkly. I sew
poorly enough that it didn't bother me. ;-) I think that it is mostly
a cosmetic thing, and that any notching or other stuff to try to fix it
will probably weaken the structure of the tarp or cause stress risers.
I recommend making cardboard or paper cutouts. I tried marking
directly on the fabric based on the measurements from the spreadsheet,
and it was a pain. Templates are well worth the effort.
Just my opinions. Good luck and have fun.
Bill in Houston
--- In email@example.com, "ihoop101" <jhoop1@...> wrote:
> I thinking of taking my flat tarp and modifing it with catenary cuts.
> My question is -- How to you figure out how deep the cut should be? I
> have found spread sheets about the different curves but nothing about
> how to figure what depth is required/desired for a certain length.