Yeah I noticed the multi-piece design, I was just wondering if the air hitting it broadside at ~6000mph would vaporize it. Though thinking if it now, if it can withstand the gforces of the initial shot, that should have been obvious. I've been working through a design that wouldn't necessitate a sac...

Very interesting. At those velocities, does the sabot shatter on exit? I would be lying if I said I haven't been thinking of ways to pack a 2 stage gun into a rifle-esque design. Quinn, as I've said before, PLEASE post any picture/video/drawing of any of the guns you've built. I would LOVE to see th...

Quinn, please stop. D_Hall, I'll have to learn more about Maxwell-Boltzmann and related topics, thanks. I may be at the upper limits of what can be accomplished with propane, in that case. Given your reasoning for the velocity potential with powder, it would stand to reason that hydrogen/oxygen woul...

What are methods of passing beyond the local SOS? I imagine things like raising temperature beyond that of standard combustion or using a fuel whose combustion produces elements with higher SOS, but these are both modifying the SOS limit rather than surpassing that limit. The ~3400fps lines up with ...

Are the expanding gasses in a hybrid not limited to local SOS like the released pressure in a pneumatic is?

I have measured upwards of 3355 feet per second with a hybrid I've been working on. Mind you, I'm using a .510" diameter 3d printed 100% infill aerodynamic projectile weighing very little. I highly doubt this is the projectile velocity, and instead is catching debris or even the gasses themselves .....

There is a sticky in the Spudfiles general forum about exactly this.

Or a picture/drawing of your pneumatic whose chamber exhibits no pressure loss from each shot.

Are you just refusing to read ANY of the 'stickies' or previous posts before making all of these threads?

Assuming you mean PETN/ETN. Discussion of the use of explosives is not allowed on these forums, to my knowledge. Also, given the level of knowledge you have shown in your multitude of questions on this forum, I'd STRONGLY recommend you do not attempt to utilize this material.

There is no way to use pressurized air as the energy source and not observe the pressure drop after use. An efficient system may be able to lessen the pressure loss, but it is impossible to eliminate it unless the pressure isn't what's being used as the primary propellant. Many people have used pcp ...

Correct me if this theory is flawed, but could it be more than simply the effective chamber being larger? The unburnt portion of the fuel has mass to it, and so as it's being propelled by the expansion of the burning fuel behind it, it pushes the projectile faster and faster. As the flame front catc...

This is very interesting. Intuitively, the highest pressure accumulated before burst would result in the highest velocity. It would stand to reason, though, that you want the disc to burst late enough to raise the chamber pressure sufficiently, but early enough for there to be unburnt fuel mix being...

Pushing my own limits, at least. Really, I'm just trying to get the most possible out of what I make. If I have to stay within a safe pressure limit, I want to do as much as possible while remaining in that limit. My primary interest lies in handheld launchers. I dabbled with large cannons in my you...

My chamber walls are around .23" thick, so I should be able to run mixes considerably higher than 15 and remain in a safety margin. (Mathwise anyway) Another thought: have you experimented with an *inner* chamber liner with a lower thermal conductivity than the chamber material? If the largest porti...