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Picking up CHRONY tonite...Finally...

A place to ask general spud cannon related questions.
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Picking up CHRONY tonite...Finally...

Unread postAuthor: jeepkahn » Fri May 15, 2009 11:47 am

So I'll finally be able to do some real testing done on the vacuum theory, and whether a GB can go supersonic from a pneumatic (i'm pretty sure I have done so, but we'll find out this weekend...)

I'll be doing a lot of # gathering that will hopefully be usefull to Rag and D-Hall in their modeling systems... So I'll be doing weights as well as muzzle velocitys...

Now, What's the optimum distance for the chrony to be set from the muzzle, and what readings other than the ones listed will be needed: PSI, barometric, temp, elevation from sealevel, projectile weight, muzzle velocity, cannon specs, humidity reading... What Else would be useful to you guys(Rag and D)???
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Unread postAuthor: jimmy101 » Fri May 15, 2009 12:37 pm

PSI, barometric, temp, elevation from sealevel, projectile weight, muzzle velocity, cannon specs, humidity

Add in friction. Be nice to have both the static and dynamic but that gets kind of tricky, though it can be done. Friction is more important than barometric pressure, temp, elevation from sealevel, or humidity.
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Unread postAuthor: jeepkahn » Fri May 15, 2009 12:51 pm

I know from modeling with ggdt, friction doesn't make a tremedous differance unless it's more than a coupla psi's worth, and in some cases more is better... And I'm a big believer in silicone spray in the barrel...
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