Indian Summer - Day 10: The green sea

Day 10:
A swift sail at last as light winds increase to a force four - and all under parasailor (a spinnaker-like headsail, vented like a kite). This is filled by the wind and then hauls the boat along through halyard, guy and sheet. This forward motion transforms the sea into a torrent of water racing past the hull and driving the self-steering servo-pendelum laterally, a movement dependent upon the swivel imparted by the wind controlled vane and transmitted to the tiller by ropes. The boat steers herself free from the touch of human hand, once set.
Meanwhile, this same stream of water drives a turbine deployed off the rear of the boat, converting from hydro to electric power and thus driving our instruments, lights, radio, fans, pumps, refrigeration, communications and computer. Another barbaric success as a third dorado provides a gourmet supper, with spare to freeze for a re-run. All we need now is home-brewed beer and elderflower wine drunk from earthenware cups and we are as green as the sea we skim so eat your heart out Jonathan Porritt.