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Re: "In the world of spuds today"

Unread postPosted: Thu Aug 22, 2019 4:38 pm
Author: jackssmirkingrevenge
Alex345 wrote:I currently have an M1 carbine disassembled on my table right now and these guns just look so mechanically similar!


Hardly surprising, they're both gas operated semi-automatic rifles, and the Mini-14 is based on the M-14 which in turn is based on the M1 Garand from the same era as the M1 Carbine.

Re: "In the world of spuds today"

Unread postPosted: Thu Aug 22, 2019 6:30 pm
Author: hectmarr
Cthulhu wrote:
hectmarr wrote:I suggest you use preloaded cartridges with HHO, and the ammunition included in them. This way it can even work semi-automatically. I have the idea, (intuitive), that likewise, a propane-air combustion weapon can be improved in this way. As always, it's a matter of manufacturing and testing, because "ideas" don't make holes, only weapons. :)


Preloaded HHO is pretty good, but hydrogen seems to find a way to escape from almost any container :lol: so they can't be stored very long (especially in the heat). Recently I've been looking at simple piston hybrid designs that could be filled via HHO for repeating fire. I bet with a microcontroller connected to the ignition and a transducer it could even be made fully auto! :idea1:

Can I instruct myself on what you explain? I was shocked because I can't integrate the microcontroller and transducer into my "Quico" head ... :? it sounds RA-TA-TA-TA-TA-TA :shock: very fast, and therefore emotional! :bounce:

Re: "In the world of spuds today"

Unread postPosted: Tue Aug 27, 2019 6:13 am
Author: jackssmirkingrevenge
Finally mustered the courage to chop the stock and I'm glad I did, added a couple of threaded inserts, rubbed tung oil into the cut segment and finished off with a 1/8" aluminum plate.

Doubtless not the best of ideas for my shoulder but in the spirit of a "whippit" gun I figured it would have been preferable if butt-stroking was required.

Besides, can't be worse than a Kar98K, right?

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Now to find some range time...

Re: "In the world of spuds today"

Unread postPosted: Thu Aug 29, 2019 4:44 pm
Author: Labtecpower
hectmarr wrote:
Cthulhu wrote:
hectmarr wrote:I suggest you use preloaded cartridges with HHO, and the ammunition included in them. This way it can even work semi-automatically. I have the idea, (intuitive), that likewise, a propane-air combustion weapon can be improved in this way. As always, it's a matter of manufacturing and testing, because "ideas" don't make holes, only weapons. :)


Preloaded HHO is pretty good, but hydrogen seems to find a way to escape from almost any container :lol: so they can't be stored very long (especially in the heat). Recently I've been looking at simple piston hybrid designs that could be filled via HHO for repeating fire. I bet with a microcontroller connected to the ignition and a transducer it could even be made fully auto! :idea1:

Can I instruct myself on what you explain? I was shocked because I can't integrate the microcontroller and transducer into my "Quico" head ... :? it sounds RA-TA-TA-TA-TA-TA :shock: very fast, and therefore emotional! :bounce:


I have found a mixture of hydrogen and oxygen as produced by electrolysis seriously lacking in power, I suspect this has to do with the fact that the reaction only produces water, and doesn't contain any buffer gas. When I added a few % of butane to the mixture the results were more promising.

@jack

Looking good there :D must be great to live in a country with some more liberal laws concerning guns..
I got my hands on a cheap used hatsan at-10 pcp, should be enough to have fun with for a while.

Re: "In the world of spuds today"

Unread postPosted: Thu Aug 29, 2019 7:33 pm
Author: Cthulhu
Labtecpower wrote:I have found a mixture of hydrogen and oxygen as produced by electrolysis seriously lacking in power, I suspect this has to do with the fact that the reaction only produces water, and doesn't contain any buffer gas. When I added a few % of butane to the mixture the results were more promising.

This is really interesting, do you think that compressing the hydrogen would increase the performance? Also what's a buffer gas?

Re: "In the world of spuds today"

Unread postPosted: Fri Sep 06, 2019 5:58 pm
Author: farcticox1
Making a slush delivery pipe at work from 2" NPT threaded weld on nipple and 2' of 2 1/4" thin wall tubing, it was just talking to me saying 'I'm a spud gun barrel, what can you fit in me' :P
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Then I had to ruin it with a 90 degree :?
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Re: "In the world of spuds today"

Unread postPosted: Tue Sep 10, 2019 6:58 am
Author: jackssmirkingrevenge
Labtecpower wrote:Looking good there :D must be great to live in a country with some more liberal laws concerning guns..


It's not 'MURICA levels of freedom but I guess I can't complain, I get to have toys like this :D

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I got my hands on a cheap used hatsan at-10 pcp, should be enough to have fun with for a while.


Booo Turkish guns!!! Booo!!!

But if it was cheap and it works, why not :) what caliber and energy?

farcticox1 wrote:Making a slush delivery pipe at work from 2" NPT threaded weld on nipple and 2' of 2 1/4" thin wall tubing, it was just talking to me saying 'I'm a spud gun barrel, what can you fit in me' :P


Reminds me of a previous life...

Re: "In the world of spuds today"

Unread postPosted: Fri Sep 13, 2019 3:27 pm
Author: hectmarr
Interesting reading about the dieseling effect. Is it possible to produce this effect on a pcp weapon? Perhaps by recompressing the air load that has expanded previously, (and cooled), by means of a pellet retention system, it could be heated sufficiently to produce this effect and increase the power. This recompression could be possible. I have only seen this effect in piston, spring or nitro piston weapons.
https://drive.google.com/file/d/1FzxLRU ... sp=sharing

Re: "In the world of spuds today"

Unread postPosted: Fri Sep 13, 2019 4:04 pm
Author: jackssmirkingrevenge
hectmarr wrote:Is it possible to produce this effect on a pcp weapon?


Here's an example that I remember from a while ago.

Re: "In the world of spuds today"

Unread postPosted: Fri Sep 13, 2019 4:39 pm
Author: hectmarr
I thought to try, include two pellets, one in the middle of the canyon and the other at the origin. Between the two, air at atmospheric pressure and a small drop of oil-derived lubricant. I have a "Halcon" pcp gun, (from the Menaldi factory), .22 caliber. I guess you should hold the firing gun if combustion occurs.
Very good post, I am reading it.

Re: "In the world of spuds today"

Unread postPosted: Fri Sep 13, 2019 5:45 pm
Author: Moonbogg
I had a spring-piston air rifle a long time ago and I thought I'd oil the spring inside to keep it fresh and healthy, so I dropped some oil right inside the air port. I was surprised when I shot the thing because it made a loud crack, smoked a little and the shot seemed more powerful than normal, lol. So yeah, that's how I learned about dieseling.

Re: "In the world of spuds today"

Unread postPosted: Fri Sep 13, 2019 7:03 pm
Author: hectmarr
Well, that kind of learning in fact, in a practical way, are the ones that teach the most, without a doubt. This whole topic is interesting, like everything that involves explosions! :bom: :D

Re: "In the world of spuds today"

Unread postPosted: Sat Sep 14, 2019 7:26 am
Author: jackssmirkingrevenge
hectmarr wrote:I thought to try, include two pellets, one in the middle of the canyon and the other at the origin. Between the two, air at atmospheric pressure and a small drop of oil-derived lubricant.


So you will be using the middle projectile as a piston?

I thought the idea was that the rush of pressurized air itself would be enough to provide enough heat for detonation.

Re: "In the world of spuds today"

Unread postPosted: Sat Sep 14, 2019 8:07 am
Author: hectmarr
It is this way. The pellet "1" is the "piston" and the "2" ammunition. Nothing needs to be modified in the weapon, (commercial standard type).
When they finish repairing my weapon, and have it with me, (leak in the charge valve), I will test and publish the results.
Here the archive publication on this topic. I find it interesting the experience of this user and the physical explanations about dieseling in pcp weapons. https://www.tapatalk.com/groups/yellow/ ... 13233.html

Good. I was doing a test with the small hybrid 1, and the dieselin if it happens, because of the smell of burnt oil that is very different from the characteristic smell of the air - butane mixture, burned, (I know it very well).
I have regulated the amount of air with the distance between the two pellets 5.5 mm. The greater the distance, more air and vice versa. As a "secondary" fuel I used light oil, just a small drop in the ass of the pellet.
This afternoon I will try to estimate if there is any appreciable increase in power. For the rest, the two pellets hit the target, with a distance between them of 1/2 inch, and the sound is the same, quite loud. There are no two explosions, it is too close for the ear to perceive it, less than 0.2 sec, which is the threshold of differentiation of the human ear.
Besides, I tried to shoot with two pellets looking lustfully, glued together, which combined have a weight of 2, 3 grams ... Tremendous hole and two cans passed cleanly. The two fly in the same direction because it is glued with cyanoacrylate. The hole is only one. Funny :)

Note:
I'm addicted these days :bounce:
 

 

Re: "In the world of spuds today"

Unread postPosted: Sat Sep 14, 2019 1:12 pm
Author: Labtecpower
jackssmirkingrevenge wrote:Booo Turkish guns!!! Booo!!!

But if it was cheap and it works, why not :) what caliber and energy?



6.35, datasheet says 46 joules or 265 m/s. Of course they don't tell with what kind of pellet that is.
This caliber should be good for moar powah though, I'd like to figure out if I can make this thing more efficient. There seems to be a lot of air coming out after the pellet has left the barrel. I was thinking something in the direction of decreasing the valve dwell time and making the diameter of the air path larger. Maybe you can enlighten me :P