Tandem,
The clever man was actually Frank Piasecki, the founder of the Vertol Company, which originally made the Chinook - check out the Chinook yaw pedals and you'll see a "V" symbol there! Frank died earlier this year, but I was fortunate to meet the great man at a meeting in Philadelphia many years ago.
http://www.nytimes.com/2008/02/15/bu...=1&oref=slogin