How far does it go!

Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
Americannon
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Wed Sep 22, 2021 7:39 pm

I just wanted to see if anyone can suggest anything for more power. I have 4 2” valves coming into a 16 foot long exhaust pipe for a barrel. All are quick exhaust modified valves. A 2” ball valve is then opened to fire. A 1 pound project I made of spackle and a 4 inch Christmas globe had a hang time of 16 second at a 61° angle, 120 psi. Can someone help me with the math for velocity or flight travel? Thanks
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iknowmy3tables
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Wed Oct 06, 2021 9:45 am

Holy moly, looks like you're trying to blow up the moon friend, lol
Let me dust off my old that math part of my brain, I can't factor for wind resistance but I got 89.64m/s or 294.1fps as your estimated velocity work math attached

That's only based on the flight time and the initial angle and assuming a vacuum And a 9.8m/s^2 acceleration of gravity. To calculate based on the cannons specs like using the GGDT program I'd need the dimensions of your air chamber and maybe a better picture of the chamber and valves
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iknowmy3tables
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Wed Oct 06, 2021 10:09 am

My mistake I forgot your initial question of how far does it go,
Expanding the math a little bit ideally it flew 695meters or 2281feet
It's probably short of that distance a good bit because that doesn't factor drag resistance, is anyone here familiar with drag coefficients?
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