2002
The rebuilding on delta or-crab's claw-sail like, for example, JUKUNG or PRA
allow me to abstain from expensive sails and masts. I think it will work
particularly at the wind even better, it is altogether easier, is to produce
more inexpensive and the height is very fast to change.
Bridges and trees are no problem, there are only 2 pods to work the sail and
no expensive blocks and scrollings etc.

The new top is completely out of stainless stell  40 mm x 1,5 mm and has a
weight incl. 2 swimmers of only approx. 38 kg ( no part is heavier than 13
kg) plus rigging (according to implementation and helm-installation).
If it works how I imagine, one has a fantastic sail-top for canoes or
similarly, that will have much joy for about 2000-? (I hope even more
favorably).

Prototypes are available.

Test drives are possible after agreement.

Patent:
I have announced the patent on the spread-adjustable sail-top for
single-hull-boats during the season. (I never had and was not at all so
expensive)