X-Mozilla-Keys:                                                                                 

On 10/19/99 05:42:52 you wrote:

Vance Jaqua wrote:

SI is not that easy - I have done
consulting for rocket people all over the world. and
the metric system is just as goofed up as inches and
feet - A "bar" is not an atmosphere - it is 14.504
psia
probably measured on a cliff top in Sweden? a std
atmosphere is 14.696 psia - 100,000 pascals ( not a
million) is very close to a bar at 14.506 psia, and a
Kg/cm^2 -is 14.223 also close but no cigar - just far
enough off to burn up in the atmosphere of Mars
instead of orbit.

I even wrote a BASIC program that would...

The hot tip is to use the units option in MathCAD by MathSoft. It lets you write
equations and commentary just like they appear in a text book, including Greek
symbols and figures that update automatically with data changes.

If you have mixed unit systems, you can input the data in whatever format they
give it to you, then list it in consistent units and/or familiar units. Recently,
I took metric dimensions on brake parts, English units on weights and speeds, and
output brake heat loads in both English and metric units. I also uses MathCAD
when sizing the SIRTF spacecraft at JPL, but I guess they didn't get the point on
the Polar Orbiter.
Gary Moir

(While, I don't own MathSoft's stock, I can sell their product: Still, this is
the straight scoop.)

I don't know what you attached Gary but it came across as gibberish.
Do you want to try again?

Paul Lamar

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