This year marked the passing of Frank Piasecki, one of the pioneers of rotary aircraft.
Piasecki was perhaps best known as the man who successfully developed the first tandem-rotor helicopter, paving the way for long-serving military aircraft like the CH-47 Chinook and the CH-46 Sea Knight.
Check it out here:
http://blog.wired.com/defense/2008/12/the-quest-for-t.html
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