On Sat, 15 Sep 2007 19:19:06 GMT, "Wayne Lundberg"
wrote:


"Wayne Lundberg" wrote in message
...
I've seen a few RFQs from Boeing subs showing CAD drawings using the
traditional right-side-up cone indicating the orthographic projection to
be
for standard Imperial ft/inch/lb.

Though 3rd angle projection is customary in the US and 1st angle is
more common in Europe and Asia; the choice of one or the other has
nothing to do with the units used. Title blocks include the truncated
cone symbol to eliminate any possibility of ambiguity.

...Mach speed ...

Mach numbers are unitless.


Why would there be a reason for them to go through their whole history and
library of data from endless successes and failures in order to meet the
world myopic desire to metricate?

A pragmatic recognition of the need to compete in the international
marketplace?

--
Ned Simmons