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by hectmarr
Fri May 31, 2019 9:49 am
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Re: Timed Valve vs Dump Valve for more power and efficiency

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 ...
by hectmarr
Fri May 07, 2021 2:23 pm
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Re: Xtreme-patator

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...
by hectmarr
Mon May 17, 2021 3:32 pm
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Re: Counter balanced hammer valve issue

I agree with your analysis. This way you won't have the problem, but an o'ring is necessary.
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by hectmarr
Tue May 18, 2021 8:57 am
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Re: Any official studies of Hybrid Cannons?

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...
by hectmarr
Tue May 25, 2021 12:52 pm
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Re: Counter balanced hammer valve issue

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...
by hectmarr
Wed May 26, 2021 11:00 am
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Re: Counter balanced hammer valve issue

Okay. Thanks for the info. I'm going to be curious about this.
by hectmarr
Thu Jun 03, 2021 9:31 pm
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Re: "In the world of spuds today"

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...
by hectmarr
Sat Jun 19, 2021 9:33 am
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Re: "In the world of spuds today"

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 ...
by hectmarr
Sun Jun 27, 2021 8:22 pm
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Re: Hybrid Piston Pilot Air Ratio

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...
by hectmarr
Sat Aug 14, 2021 8:55 pm
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Re: Hybrid Piston Pilot Air Ratio

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...
by hectmarr
Sat Aug 14, 2021 10:47 am
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Re: Hybrid Piston Pilot Air Ratio

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...
by hectmarr
Fri Aug 13, 2021 4:46 pm
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Re: Hybrid Piston Pilot Air Ratio

Here are the photos of how it is inside.
Válvula a pistón 1.JPG
Válvula a pistón 2.JPG
Válvula a pistón 3.JPG
Here are the photos of how it is inside.
by hectmarr
Sat Jul 10, 2021 9:41 am
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Re: Hybrid Piston Pilot Air Ratio

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...
by hectmarr
Thu Aug 19, 2021 6:47 pm
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Re: Hybrid Piston Pilot Air Ratio

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.
by hectmarr
Sat Nov 13, 2021 10:16 am
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Re: Designing a inline piston pressure regulator - Fluid statics math model

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 ...