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Drawing and cutting arcs (possibly a repost?)
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Subject: Drawing and cutting arcs (possibly a repost?)
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From: salanne@convex.csc.FI (Simo Salanne)
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Date: Mon, 30 Aug 1993 23:11:03 -1000
I tried to post this already, but it didn't appear on my news
server. I am sorry if it's unnecessary repost.
"Jaco" dividers (pair of compasses)
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Curved shapes are very popular in kites today. Not only
for decorative purposes, but e.g. in trailing edge of
single or dual line deltas to reduce unwanted flutter.
One technique to draw wide arcs is to use a bent spar as
ruler. This works very well unless a certain radius of
curve is wanted. A calculator and some knowledge of
geometry is needed to determine the amount of bend
corresponding to the wanted radius.
More straightforward way is to use dividers.
Because dividers of useful size ( > 1 meter) are not
available, or are very expensive and clumsy, we have to
make one by our selves.
The key components are the same we use to build sport
kites: leading edge connectors and a carbon spar. I used
T-shaped Jaco Pro connectors - because they are good, and
I had them on the shelf. I inserted a nail in one of the
connectors. Actually I glued a nail inside of a piece of
carbon spar, which fits nicely in the connector. To the
other connector I put a pencil, I had to use sand paper
to make it fit.
Now, take a full lenght of spar, put the connectors with
nail and pencil on it, adjust the distance and start
drawing your templates. The nail should keep one end in
place when you draw your arcs.
Some additional tips.
I use heavy metal pieces to keep templates, fabrics etc.
in place when I work on them. (Actually they are old,
damaged loudspeakers, tweeters. The cone is removed). I
drilled a hole for the nail in one of the weigths, now
the center of the arc can be outside of the template
material.
I also made a knife acessory for the Jaco dividers; I cut
a slot in a connector through one wall, inserted a piece
of Stanley cutter blades, tightened with a cable tie in
place. With the knife I can cut curved panels from fabric
directly, without a template:-))
Hot cutting accessory is still unsolved.
Disclaimer: I am just a customer of Jaco Engineering...
Smooth Winds
Simo.Salanne@csc.fi
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