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Posted for "richard titsworth" <rtitsworth@mindspring.com>:
Bob,
My earlier post included a diagram which highlights the definitional
geometry as I understand it, and from the Garrett web-site.
It is truly the "throat area" / "radius from spindle center line to throat
centroid".
So, good question on the unitless issue :-? Simple unit cancellation.
and it doesn't work.
I did a mental experiment to confirm, and units DO matter.
I assume Garrett/Kelly/tcm etc are using inches. (will require some
follow-up).
Thanks,
Rick
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