In a message dated 3/10/2013 9:48:42 P.M. Pacific Daylight Time, ronh at owt.com writes: The blades on a riding mower have a far higher rotary inertia than the little Corvair blower wheels. RonH Of course, Ron, I have yet to down-shift a riding mower entering turn 6 at Laguna Seca. But that's just me! <grin> - Seth Emerson