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How to do calculations for a cannon distance, angle, etc?

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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How to do calculations for a cannon distance, angle, etc?

Unread postAuthor: aj23 » Mon Jun 04, 2012 4:55 pm

I know there are programs out there for the calculations, but I need the actual data and each step in the calculations for a physics project. Does anyone know how this would work with a pneumatic cannon using a piston valve, in terms of figuring out the distance it can fire with given angles and pressure?
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Unread postAuthor: Technician1002 » Mon Jun 04, 2012 5:12 pm

This is complex. Too many variables are unknown. On earth, air atmosphere provides randomness to projectiles with undefined aerodynamics. I would not even want to calculate the landing area of this example shot below. As you can see the atmosphere has a huge impact on the flight of the projectile.
http://www.youtube.com/watch?v=y2fDxDCHPfo
The projectile flight is not predictable without a complex fluid dynamics model.

If your projectile has a more ballistic flight path, then a ballistics prediction can be made using known launch angles and velocity. Try using GGDT.
http://www.thehalls-in-bfe.com/GGDT/usage_ballistic.html
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Unread postAuthor: jackssmirkingrevenge » Tue Jun 05, 2012 12:49 am

http://hyperphysics.phy-astr.gsu.edu/hbase/traj.html

It gets a little more complex when you throw in air resistance though.

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Unread postAuthor: D_Hall » Tue Jun 05, 2012 8:52 am

Alternatively, in recent days some Indian-born kid in Germany supposedly came up with a general form equation to answer ye ol' ballistics problem. A bit of research to see what the kid did could prove to the teach that you can do it and that you're up on current events in science.
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Re: How to do calculations for a cannon distance, angle, etc

Unread postAuthor: Tipsypyro » Mon Jan 19, 2015 11:56 pm

Cant find it. Do you have a link?
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Re: How to do calculations for a cannon distance, angle, etc

Unread postAuthor: jrrdw » Tue Jan 20, 2015 3:23 am

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When life gives you lemons...throw them back they suck!
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