Just that. My analogy is with a subsonic turbojet nozzle, which ejects the gas with a lot of pressure in the outlet area of the nozzle, it does not have as much speed or performance as a nozzle that causes the pressure to drop to values close to atmospheric pressure. In the first case, the velocity ...

wow is supersonic!! :o I imagine some of your creations also exceed the speed of sound ;) even though your projects focus mostly on function and not maximum performance. It is possible although I don't really know. I have shot 6mm bb of 0.23gr plastic, with my hybrid gun at 7X, and I think it is mo...

I agree with your analysis. This way you won't have the problem, but an o'ring is necessary.

Perhaps you should associate the physical phenomena that occur in a hybrid, with machines that produce mechanical energy in the same way, but that are something else, for example an internal combustion engine. It has there, a fuel, air, a spark plug and an explosion, in a cylinder. Imagine a motorcy...

There are different configurations for balanced valves, this post should be of interest if you haven't seen it already. Most of them have the opposite problem of not reclosing. The solution for that is the same as the spirit of Hector's suggestion, bleeding air from the transfer port in order to fo...

Okay. Thanks for the info. I'm going to be curious about this.

What do you think... What will be the next step in airguns? Maybe more pressure to achieve more power, or more autonomy? I think that the boys of 60 or 70 years in the future, they are not going to shoot with the same thing that we shoot. In aviation, they went from propellers to turbines, from ther...

I agree with JSR. I wouldn't expect any major revolutions in the airgun world, but instead continued incremental evolution and possibly changing popularity trends. You can already buy a PCP semi-auto that will shoot the wings off a gnat. What would really get me excited is the commercialization of ...

Actually the valve is like in the drawing. I did some tests, with the piston ratio 6.5 mm - 8 mm, as it is at present, but, with different pressures in the combustion chamber and the pilot, and compared. In the first case, it is 7 bar for the combustion chamber and 7 bar for the pilot. In the second...

If you're right. I'm going to try to get a harder o'ring, as a first alternative solution. The second may be, why not? what you propose, make a thread in the place of the o'ring groove, and a small plate with some material to seal the exit of the combustion chamber. For now I have to try another har...

I understand what you tell me. Actually the small o'ring does not touch anything. It is built as in the drawing. The o'ring fits into a 6.5 mm bronze tube with a conical mouthpiece and all well mirror polished, when moved to the left, (in the drawing), to seal the combustion chamber. When combustion...

Here are the photos of how it is inside. Here are the photos of how it is inside.

Well, the valve was tested but it has a drawback that makes it almost useless. I am referring to this piston valve design exclusively. The practical problem is that it does not retain the lubrication in the small 6.5 mm piston, and for this reason, the o'ring breaks ... Perhaps the solution is to in...

I had the valve and the entire bolt system of the weapon that I am planning built by a turner. I actually drew everything in detail, and measurements, exact, and I passed it to him.
It is not a very neat job, but it works fast and it pays quite little, it is what it is.

This little pressure regulator, I made it. As the areas on the two faces of the piston, (6.3 mm) are equal, the high pressure compressed air, (arrow in dark blue), that enters produces the same force in both directions, and the piston is balanced, without any math. The displacement of the piston is ...