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Agreed on both the Huey and S-61 choices.  The Huey of course is loud (with the 2 bladed rotor). But why consider an S-61 with its two engines?  My only guess is that their test objectives were not necessarily to come up with the quietest helicopter, but to determine just how much they could reduce the noise of existing helicopters. Developing a really quiet helicopter may have been a secondary goal, and the only one that got carried forward.