Those things are spinning at maybe 20000rpm? Say 3" diameter, that would be .75 ft circumference, that's only 250ft/sec, way subsonic (sonic speed is ~1050fps at ambient) esp at higher temps. They might be chopping the exhaust into little pulses as it goes through the blades.
--R John Robbins wrote: > Rich Thomas wrote: > >> The actually sound was quite interesting to hear too -- it sounded >> quite "choppy" as the individual shock waves passed ears, with the >> chopping sound kinda overlaid on the very loud roar of the whole >> thing. The chops were due to each blade rotation and how the shocks >> radiated -- sort of complex sound field but pretty cool to hear. >> > > I wonder if something similar is happening in the turbine of the new > powerstrokes. I've always wondered how they make that "chopping" > exhaust noise (don't know of any other way to describe it) on the highway. > > John > > > _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
