Auto-rotary craft
Very belated thanks "Helinut" for most helpful, necessary, advice re CAA code on autogyro design from which I have been learning applicable details. Ultimately I understand that safety will derive from pilot training and skill, but I believe that design of aircraft has to contribute. Even in the CAA specifications it does at least twice refer to activation of a control and its effect should be within capability of an average pilot of average strength. Also they have identified a past cause of accidents where starting procedure was wholly or partly initiated outside the craft; such that now mandatory for design to accomodate pilot in place from start.