Refer
to How to Build a Sled Kite for more information.
Experimenting with different variations in the Allison (Sled) kite genre,
I tried longer than normal
sail lengths but found they had a tendency to collapse much more easily.
Another shape similar to
the diamond kite shape but in a flexible Sled form proved to be unstable.
Another shape which I felt would not perform due to the curvature of
the keels proved otherwise.
Normally keels are of a triangle shape so the tension is evenly spread
without any loose material
folding out of shape. The curvature of the Round Sled's keel
pulled
the top of the circular sail in and flared the lower section out, making
the kite very stable and flying at a higher angle than my
other Sled Kites which were tethered near by.
All experiments with different shapes were carried out on the same day
and within 15 minutes of
each trial so a reasonable comparison could be made.