The Rotodyne had an exceptional lift capability when compared to its basic weight, even by today's standards.
The tip jets were only needed for very low speed and vertical flight, so cruise noise was far less.
Shameful to think it was axed.
Also shameful that the article mentioned the lack of a city heliport in our capital in the early 1960s and yet even today we still have to rely on the ever more difficult Battersea landing site.