Sustainable Free Energy from the Wind
Development of a self-trimming automatic wingsail system
By Peter Worsley
sailing rigs for boats have been around for hundreds of years, and have
not changed much in that time. But with the development of aircraft it can
be seen that wingsails are possible that get rid of the difficulties of
traditional sailing and are more effective too. A self -trimming wingsail system can take
away the need for constant attention and monitoring all the time which you
need to do with sails, and can be made completely automatic, requiring no
specialist skills from the operator.
For 20 years I have been researching
and experimenting with self-trimming wingsail systems. Firstly with
This is the system
where you have an additional surface mounted behind the wingsail (the
tail) which aligns the wing at all times to the wind.
In other words the wind does the work more accurately than manual sheeting can do on traditional sailing rigs.
To prove the concept I started by testing radio controlled models - later I progressed to a man-carrying version
used the control system in the diagram below.
The wing and tail swing with the wind
like a windvane. When the wind is directly ahead the
The addition of a wing flap
Although the above system
works well and has been used on models and fullsize with just a simple
aerofoil on the wing.
But how to make the flap move in direction from one tack to the other?
The system I used was to
connect the flap to move in opposition to the movement of the tail. So it
was connected to the
Would it work? I tested the system on my 2 metre test catamaran
As can be seen it worked well. Sometimes I could hardly keep up with it!
P. Worsley 2013/2020