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pressure loss

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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pressure loss

Unread postAuthor: WEEMAN » Tue Sep 23, 2008 2:09 pm

Im currently working on a rifle sized spudgun with a nice big expansion chamber(1 1/2 foot to 2 foot) and a shoretr barrel(like 3 foot) but the only problem i can think of is loss of pressure....number 3.....
i want it to be like a shotty type gun but idk what to do do improve on the(REALLY) rough design.....


1-expansion chamber
2-4 to 2 inck bell reducer
3-2 90 degree elbows,interlocking kind
4-male adaptor for different sized barrels

so am i gonna lose pressure or not?
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dont ask it really rough....ive actually done a real draft in my class at school
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Unread postAuthor: Demon » Tue Sep 23, 2008 3:02 pm

You wont, because your propellant will fill the elbows too, so dont care about that.

Try making an pneumatic instead, more power, less sise :wink:
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Unread postAuthor: SpudFarm » Tue Sep 23, 2008 3:11 pm

so i did draw the diagram i said on msn and since you left i can post here.

don't care to say that i did not write the right names on the fittings because i know that
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"Made in France"
- A spud gun insurance.
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Unread postAuthor: WEEMAN » Wed Sep 24, 2008 8:32 am

lol thanks!! ill try to make that :P
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Unread postAuthor: starman » Wed Sep 24, 2008 8:51 am

You won't "lose pressure" but you should use a standard coupler and reducer bushing instead of that bell reducer. Also mount your BBQ ignitor and associated spark gap hardware with as few holes in the chamber as possible and through 2 layers of PVC (through a coupler and chamber) when you do.

This is a pretty standard configuration of an over and under combustion.
Also if you are shooting spuds, 1.5" is a better diameter and 2".
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Unread postAuthor: psycix » Thu Sep 25, 2008 11:10 am

starman, its pneumatic
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