Sustainable Free Energy from the Wind
Development of a self-trimming automatic wingsail system
By Peter Worsley
Page two (Fullsize testing)
To test the wingsail control systems in a bigger size I used a Hawke "Surfcat" beach catamaran which is approximately 4 metres in length.
Several different ways were tried to control the angle of the tail to enable self-trimming. To allow the 15 degrees movement either way for either tack.
Manual cable control
The helmsman only needs to
move the lever to point in the direction the wind is coming from.
As this was a cable system the rig could only rotate 90 degrees either side, as in the model system on the previous page
Manual Radio Control
Allowing the rig to rotate
through 360 degrees is a better option, but this is not possible with
the direct mechanical connection.
This was a good system and it
worked well. It was the first time 360 degree rotation of the rig was
possible. But the helmsman
P. Worsley 2013/2020