The sound analogy fascinates me. It makes me wonder if, like with the medium used in a plane's propulsion(air), we could somehow compress the LCM the way a jet engine compresses air. It pushes the air past it's speed limit via that compression and subsequent release. Of course that would require actually understanding how to manipulate the LCM the way we manipulate air....
"Regret can only change the future" -Me
"Every judgment teeters on the brink of error. To claim absolute knowledge is to become monstrous. Knowledge is an unending adventure at the edge of uncertainty." Frank Herbert, Dune 1965