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by hectmarr
Mon Jun 15, 2020 10:28 am
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Re: Ideas for biodegradable cannon-balls

I recommend the meatballs my mother-in-law makes. :shock: I never consume them and they can be useful for what you are looking for. I always told myself that the woman had the soul of an ammunition manufacturer and not much of a cook :lol: :lol:
 
by hectmarr
Sun Jun 21, 2020 9:51 am
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Re: "Sabotless" Semi-Automatic Shotgun Concept

I was having a bit of a think about this idea and it seems it could be greatly simplified and also made more efficient: https://i.imgur.com/Csm81PX.gif The piston itself becomes the hammer that opens an inline balanced valve. It is good simplification. I think that the stem that drives the projecti...
by hectmarr
Sun Jun 21, 2020 2:13 pm
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Re: "Sabotless" Semi-Automatic Shotgun Concept

A different application from your idea. The trigger you actually draw is the initiator of the recharge of the repeat hybrid. It is the mechanical locking of the piston, which allows it to move to the right, by the action of the spring, and then, to the left by the action of compressed air. To fire, ...
by hectmarr
Fri Dec 06, 2019 7:39 am
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Re: Small semi automatic hybrid project

Taking up development Freshly painted, military green and black, to start eagerly! :D A few days ago I rebuilt the piston, which is now metal. The resin he had is not a friend of the heat generated by firing often. I changed some 4mm hoses for 6mm hoses, and fires every 2 seconds, before I did every...
by hectmarr
Sat Aug 22, 2020 12:12 pm
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Autonomous pistol .22

My new self-made short gun. It is a hybrid pistol, with a built-in air pump, that operates with 8x and five strokes only. It shoots common pellets, .22, and the firing barrel is 12 micro-ridged, 200mm long. My friend's chrono gave about 650 fps on 4.5 ml of butane. It weighs about 900 grams, and ret...
by hectmarr
Tue Aug 25, 2020 9:53 am
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Re: Autonomous pistol .22

With bolt-on system for loading ammunition, I finished it yesterday ;)
PAB-I sistema cerrojo.JPG
by hectmarr
Mon Sep 07, 2020 3:02 pm
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Re: Autonomous pistol .22

I got a good price for a silencer that is just right for the barrel thread. The gun was literally silent! 8-) , in good time.
pistola a bombeo híbrida 1.JPG
by hectmarr
Sat Oct 17, 2020 8:32 pm
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Re: Autonomous pistol .22

I made a more detailed drawing of this type of trigger valve that I am testing. In fact, it is necessary to contain the kinetic energy of the ball, when it has left the main retention that blocks the combustion chamber. The problem that appears is that the ball tends to bounce and obstruct the gas o...
by hectmarr
Sun Oct 18, 2020 8:59 am
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Re: Autonomous pistol .22

What I should do is build a piston valve like the one you drew and compare with the other, to see directly how they behave. I have compared it to the rupture disc system that I have, that which I built at the beginning, with aluminum foil discs, and I am working on that. I haven't noticed much of a ...
by hectmarr
Tue Oct 20, 2020 11:42 am
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Re: Fly-K mortar - "captive piston" variation

I like the system, I did not know it. I have a kind of "grenade launcher" that works with a rupture disc, but it is not exactly like the drawing. The projectile is simply housed in the firing barrel. It is an ancient weapon that I built, that I adapted for this purpose. The "cartridge" that houses t...
by hectmarr
Tue Oct 20, 2020 12:20 pm
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Re: Fly-K mortar - "captive piston" variation

This is. I know it is not the same because the weapon has a firing barrel, but it has something to do with it, I think.
by hectmarr
Mon Oct 26, 2020 9:37 am
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Re: JSR's workshop chronicles

Excellent! I see in the future well finished weapons and a lot of fun for you, and for me. :)
by hectmarr
Mon Nov 30, 2020 7:59 pm
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Re: HA-VI

Running some tests with the system presented here, I have noticed that for the same pressure, there are differences when using this system and pumping with the manual air pump. I think that the energy of the shot is greater when compressing with the manual pump because the mixture charge takes more ...
by hectmarr
Mon Nov 30, 2020 8:17 pm
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Re: "In the world of spuds today"

Wonderful work, and if it is functional, much more! Ami I like small things, airplanes, weapons women etc. :)
by hectmarr
Tue Dec 01, 2020 2:36 pm
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Re: HA-VI

You can check your question here: https://www.spudfiles.com/viewforum.php?f=5 This place is for serious questions, "Short question topic". It may happen that the refrigerator compressor is dirty inside. I removed a black residue from mine that obstructed the entire airflow and fouled the entire weap...