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

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