Hi Eddie

Brilliant – you are indeed a Smart 🙂 , did you just Google ‘cowl sprocket’?

It is a very good compact design and explains why you can’t really see it in the photos. You can see the raised bumps on the big flaps that I guess keep them in place and allow them to hinge.

I’ll read the patent through as I an interested to see how they resolve the confict between the linear movement of the sprocket and the (albiet small) rotation of the ‘finger’ part.

Clearly there would be the need for a powerful chain drive as the mechanical advantage is with the wind on the flap tips.

Thanks All

James