Hiller UH12
If any one is interested a book called vertical challenge records the complete history of Hiller Helicopters and is a fantastic story of Stanley Hiller Designing, Building and learning to fly and forming Hiller Helicopters.
They hold many records and are a great machine (Considering their age !!)
Regards
Duncan
PS I am not biased as such but do own one and fly it from Rochester in kent. UK