Nick ~ just an idea.

It's said that the S-92 has a quiet rotor. In addition, everyone knows that the rotor is controlled by the swashplate.

On the S-92 why not rename the 'swashplate' to 'swishplate'?

swash ~ to make violent noisy movements ~ Merriam-Webster's Online Dictionary
swish ~ to (cause to) move quickly through the air making a soft sound ~ Cambridge International Dictionary of English

Dave J.