Twenty-one years ago, a small group of people who were very dissatisfied with the state of the art of aerial crop spraying, met over coffee in the sitting room of Mr. Foster's home near Heathrow. Inevitably, one of the topics discussed was the need for better crop spraying aircraft. The most important outcome of that (and several subsequent meetings) was the formation of the Agricultural Aviation Group of the Royal Aeronautical Society, now celebrating its majority. Of that group I was, and still am, the one who knew least about aerodynamics or aircraft design. However, as the last remaining founder member of this Group, perhaps it is not entirely inappropriate that I should take one last look at the future of spray aircraft design, before removing myself from the scene.