Hi, I have a Moss Heptawing Tarp that I have always
refereed to as a type of Catenary Cut or Curve tarp.
Bill Moss called it a "Hyperbolic Parabola." I really
like the tarp design and size and would only replace
it with another one of the same pattern, but lighter.
I am also a Potter and have built or helped build a
number of Catenary Arch Kilns. To create the Catenary
curve we would decide how wide the base of the Kiln
would be and how tall the kiln would be. Then working
upside down we would attach a chain to a wall on the
left side of the base, drop the chain down as far as
the kiln was tall, then bring the other end of the
chain up and attach it to the right side of the base.
The natural drape of the chain gave us our Cantenary
Arch or curve. I don't know how this comes into play
for a tarp design. I would guess it was all done with
a computer program. If you look at this web site you
can see several pictures of the Heptawing.
I just hung my Heptawing Trap outside long enough to
take a picture of it attached only at the ridge-line.
The sides are just hanging down and you get a good
side view. When the Heptawing is hung between two
trees as I would to cover my Hammock, the ridge-line
curve is not very noticeable. When I use the tent
poles that came with the tarp the curve is much more
noticeable. I was told that MSR, who now sells the
Moss line of tarp, is going to stop selling the
Does any of this make any difference, I don't know
that answer. I have some .64oz silnylon and will make
a copy my tarp some day in the lighter material. I
should be able to go from 23oz to about 7 or 8oz.
Would I buy a tarp of this design at the lower weight
to keep from making my own, Yes, I think so. Hint -
--- simva4040 <simva4040@...
> Hmmmm, never thought about a catenary cut
> ridgeline??? I will study
> catenary cuts tonight when I can..but by definition:
> SYLLABICATION: cat�e�nar�y
> PRONUNCIATION: AUDIO: ktn-r, k-tn-r KEY
> NOUN: Inflected forms: pl. cat�e�nar�ies
> 1. The curve formed by a perfectly flexible,
> uniformly dense, and
> inextensible cable suspended from its endpoints. It
> is identical to
> the graph of a hyperbolic cosine.
> 2. Something having the general shape of this curve.
> ETYMOLOGY: New Latin catnria, from Latin, feminine
> of catnrius,
> relating to a chain, from catna, chain.
> OTHER FORMS: cate�nary ?ADJEC
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