Funny thing is only real pilots whether scale or R/C notice these things. I was a helicopter pilot in the Army. I remember back in the late 70's, I was watching the "6 Million Dollar Man." Well there was one show where a Jet Ranger Pilot started up the helicopter. I immediately started laughing to a point of tears. Nobody else in the room "got it." I was listening to the sounds of pistons thudding away instead of the whine of the N1 & turbine.