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Yes, a tail is a nice and very stable means of trimming a wing, but these extra control surfaces also add extra drag. The system we have implemented is a mechanical spring/damper system that sheets the sail depending on the applied load, hence takes into account changes in apparent wind and direction. When the vehicle is being moved around, we lock the wing in the centre, meaning it is always stalled. This limits the force generated by the wing to purely drag. However, if it is allowed to 'feather' and generate 'lift' substantial forces are created and we rely on the large hydraulic brake to keep it in one place, which works, normally!! On a boat, however, the craft is not as stable as , with three fat tyres on the tarmac, so I would suggest aerodynamic trimming (tail, flaps, etc) as the most appropriate means. This will also allow true 360 deg. weather cocking, which we do not have on the land craft. Hope this helps, Richard.
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