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Need Help GGDT'ing my gun.... Please help...

A place to ask general spud cannon related questions.
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Need Help GGDT'ing my gun.... Please help...

Unread postAuthor: spudkpi » Thu Aug 10, 2006 7:39 pm

I have just made a coaxial piston cannon and i would liek to GGDT it but i dont know the exact inner and outer dia. of the chamber or the flow coef. or the friction of the projectile or any of it... if someone could give me a link to a walkthrough or just help me out I would greatly appreciate it... thanks.


Here's my gun: http://www.spudfiles.com/forums/viewtopic.php?t=3079&
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Unread postAuthor: Steve- » Thu Aug 10, 2006 8:25 pm

i need help too, i can't figure out why the outer diameter would change anything because isn't that only the pipe wall width which only changes the strength of the pipe???

edit: i think i got it, the outer diameter is the inner diameter of your chamber and the inner diameter is the width of your valve input

new edit: i looked on the website and acctually the inner diameter is only for coaxial meanin the outer width of the tube inside the chamber.

newer edit: benstern beat me too the punch
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Last edited by Steve- on Thu Aug 10, 2006 9:45 pm, edited 3 times in total.
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Unread postAuthor: spudkpi » Thu Aug 10, 2006 8:55 pm

is it really? thanks man ill try it
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Unread postAuthor: benstern » Thu Aug 10, 2006 9:15 pm

Inter diameter is only used if you have a coaxel cannon. Just put the inter diameter (exact not nominal size) of you chamber in the Outer Diam box.
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Unread postAuthor: spudkpi » Thu Aug 10, 2006 9:32 pm

Thanks benstern.
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Unread postAuthor: Shrimphead » Fri Aug 11, 2006 12:01 am

If you were to go to the "other" section of this site, then to "pipe info", you could find out the pipe dimensions.
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Unread postAuthor: spudkpi » Fri Aug 11, 2006 2:24 pm

Yep there it is.... with a paintball it shows 635 ft/s at 80 psi.... thanks guys
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