Plans or kit for wind vane self-steering

[Kukri]

Anyone know what sizes of boats the Hebridean is suitable for, please?

Or other recommendations for a 40' boat?

40ft - Monitor or Hydrovane.

 

[jamie N]

I knocked up a trim tab Hasler unit in a couple of days last year. The building didn't take long at all, once the thinking & research was done. I used a child's BMX frame to provide the interface between the vane and the trim tab, which worked well enough. The difficulty that I had was in not tuning the rig well enough to make it basically neutral, which would help the self steering. I'm now further modifying it to make it more efficient, and feel that this Mk.2 will be OK. I'm a project sort of person though, so my DIY solution might be completely daft to the OP, or others!