Nice experiment! Now the OP can just focus on simplicity.

An interesting question and I thought worth investigating, so I made the following modifications to the Mini Hybrid II : Blunt endcap insert: 20231123_211452.jpg Insert bore tapered: 20231123_214925.jpg I fired two shots each with both endcap variations, for each shot I used a 63cm long 0.177" barr...

Nice launching system!! The Diesel hammer came to mind. I imagine that it would be impossible due to the weight of the ammunition necessary to achieve the compression necessary to achieve self-ignition of an air-fuel mixture. My inspiring system!

I like the last animation .
With the Grub screw restrictor to adjust the air port so then adjust closing time of valve .

It looks good and I think it's an interesting adaptation. I'm not sure how a sliding breech works...

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...

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 bein...

In my view, that is the most feasible and simplest explanation. The longer the projectile is pushed by hot air that does not lose pressure as quickly, is better than hot air with more pressure that will always decrease if the maximum peak was reached before the projectile begins to move. I have veri...

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...

Late to the thread here (and I've only read the first post) but one of the things I've seen with VERA is that the burst pressure doesn't really make much difference (at least, not on her). Why? Simple, really... Once the disk bursts and the gases start to move, everything becomes very turbulent. Wit...

A mesh screen would kick up turbulence but also suck up a lot of heat. We have discussed before if running the chamber fan during firing might increase the burn speed. Way back when I measured burn speed in a closed chamber at 1x with/without the fan running and with one or three sparks gaps. There ...

My gut says we're on to something.... You need something to induce turbulence!

Late to the thread here (and I've only read the first post) but one of the things I've seen with VERA is that the burst pressure doesn't really make much difference (at least, not on her). Why? Simple, really... Once the disk bursts and the gases start to move, everything becomes very turbulent. Wi...

It is clear what is happening, as far as I can understand. You can play with the size, shape and quantity of the hole. Also with the volumes of both chambers. Great that you can try all this. In my particular case, if 20 or 30% improvements can be obtained, I will apply it without hesitation to my w...

As seen in the tests, it could improve a combustion weapon. In a hybrid we could reach the same energies with more discs. Very interesting that we have proof of all this. As you think, maybe for a low pressure hybrid it can improve something.