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GGDT runtime error 76

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Gippeto » Sat Dec 20, 2008 2:51 pm

gm = grams
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Unread postAuthor: john bunsenburner » Sat Dec 20, 2008 2:53 pm

so wait, the whole thing is imperial and the mass is in grams?
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Unread postAuthor: Hotwired » Sat Dec 20, 2008 4:09 pm

No, the whole thing uses imperial and/or metric units for length, temperature, mass, volume and speed.

It depends on how you like it.

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Unread postAuthor: john bunsenburner » Sat Dec 20, 2008 4:26 pm

Thank you guys!
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Unread postAuthor: Gippeto » Sat Dec 20, 2008 4:46 pm

My installation is in imperial units (inches, psig, oz, etc.) and yet the projectile mass IS in grams, or perhaps...not.

gm
an incorrect symbol for the gram (see below). The correct symbol is g. In engineering, "gm" is sometimes used to distinguish "gram mass" from "gram force" (gf). This practice is not recommended.

Taken from here;

http://www.unc.edu/~rowlett/units/dictG.html

Whether it's mass in grams, or gram mass, I suspect that the result is invariably, the same.

In the end, it doesn't matter, the program WORKS. :)
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Unread postAuthor: D_Hall » Sat Dec 20, 2008 10:13 pm

I use "gm" for grams because I found that some folks would get confused by just a "g".... They were gun folks and to them, "g" meant "grains" not "grams." Yes, I know that "grains" is normally abreviated "gr" but they were still confused.... So I went with "gm" and until today I'd not heard another word of confusion about it.
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