If someone were able to produce a Very Light Helicopter which had the following attributes ; Deisel engine. One piece composite airfame/body. Rotor system that would permit engine off landings from 30foot hover. Running costs of £20/hr. The limitations being, Single place, Max operating height 40 feet. Limited range. Would there be a market for such a machine?
You're not still pursuing this pipedream are you budgey?
Why are you so attached to putting a ceiling on this machine. We want to fly, not hug the ground.
Mind you it might go down well with the swamp buggy fraternity...check their forum out