To: SASless
I believe that the whale you refer to is the Agusta 101. It was built in order to get Vertol to sign a contract for Agusta to build and market the CH-47. Agusta said that if Vertol did not give them a license they would put the 101 into production thus stifling Vertols' ability to market the CH-47 in Europe and Africa and the Middle East.
The rotorhead was a French design similar to that used on the Allouette. I don't know how much French influence was in the design but it looks a lot like a Super Frelon.