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shockwave cannon

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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shockwave cannon

Unread postAuthor: matti » Fri Jul 01, 2011 7:28 am

sorry, i had to remove this.
If questions please PM me.
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Last edited by matti on Tue May 01, 2012 2:02 pm, edited 1 time in total.
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Unread postAuthor: Moonbogg » Fri Jul 01, 2011 2:21 pm

Good ideas? Just make one.
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Unread postAuthor: Fnord » Fri Jul 01, 2011 3:15 pm

I can't tell you exactly what you need for your design, but consider some basic physics:

Air isn't a great medium for transmitting energy; there's lots pf brownian motion involved that will cause a shockwave to dissipate quickly. This is especially true when you have a scenario with a very high energy system(the hybrid's muzzle flash) interacting with very low energy system (the surrounding atmosphere).

What vortex cannons do is take all that energy and get it moving in one direction as a much slower, high-mass system with tons of momentum but not a lot of velocity. This is why the vortex cannons on youtube have extremely small C:B ratios. A tapered conical barrel helps the gas flow expand in a uniform way, creating a more stable vortex.

As an example you can visualize, shoot a bowling ball at 230 fps and a .50 cal into a swimming pool and you'll probably leave a crater at the bottom with the bowling ball, but the .50 cal will dissipate all its energy within a few feet of interacting with the water (both projectiles have roughly the same kinetic energy).

A piston valve will cause more flow turbulence than a burst disk. Perhaps you could try building a "toolie" style piston valve instead(?). It would require custom machining but you seem capable of that.
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