Hybrid pumped weapon project

Harness the power of precision mixtures of pressurized flammable vapor. Safety first! These are advanced potato guns - not for the beginner.
hectmarr
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Sat Apr 30, 2022 6:19 pm

This is a project called "Armadas 1500 II". It is a weapon that works with an integrated air pump, it is a single shot, hybrid that precompresses at 8X - 10X.
The firing barrel is with 12 microgrooves, caliber .25 and fires common pellets. The inverted bolt is made of 1045 steel, the combustion chamber is approximately 20 ml. It has quite a bit of punch, going through 4 cans cleanly at 8X, with only 4 pumps.
It is an evolution of the previous ones, because it has more performance, 4 or 5 pumps are enough to compress the mixture and fire.
The dosing system is the standard one that I designed, and it works very well. Accuracy is excellent.
I used a motorcycle spark plug, screwed into the combustion chamber which makes it fire safely. The lighter is piezoelectric from the big ones.
The main valve is of the o'ring and ball type, which works excellent (it is the "captive ball" valve). The o-ring lasts about 150 - 180 shots before being replaced, which is easy, without having to remove too much.
The front tube houses the small liquid butane gas tank, and has its manually operated valve (pressed with the finger), to introduce the gas to the dosing system, about 6ml.
The sequence of operation is simple: You close the valve, place the pellets in the chamber, introduce the butane and give 4 pumps. The pumping lever, in this case the rear, includes the shoulder rest.
The ball valve - o'ring, is closed by pressing the small stem that can be seen on the back of the gun.
AR 1500 II  general.JPG
AR 1500 II (1).JPG
AR 1500 II, (2).JPG
AR 1500 II, (3).JPG
AR 1500 II, (4).JPG
AR 1500 II (5).JPG
AR 1500 II (6).JPG
Last edited by hectmarr on Sat Aug 06, 2022 11:34 am, edited 2 times in total.
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Moonbogg
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Wed May 04, 2022 2:25 am

That is really clean and very nice. I love that it's a hybrid. So awesome. Nice job!
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Anatine Duo
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Sat May 07, 2022 7:29 am

Sick! Looks very well put together. Inspiring actually!
hectmarr
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Sat May 07, 2022 10:45 am

Thank you so much guys! :)
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jackssmirkingrevenge
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Thu Jun 16, 2022 9:14 am

Very clean work, nice "proper" evolution after all that prototyping...

I like the markings too, although perhaps it's more of a Fuerza Aerea (+Butanea) Argentina sort of equipment :D
hectmarr wrote:You have to make many weapons, because this field is long and short life
hectmarr
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Thu Jun 16, 2022 9:23 am

jackssmirkingrevenge wrote:
Thu Jun 16, 2022 9:14 am
Very clean work, nice "proper" evolution after all that prototyping...

I like the markings too, although perhaps it's more of a Fuerza Aerea (+Butanea) Argentina sort of equipment :D
Hi Jack!! Oh yes, I'm going to change the brand as you suggest :) . Thank you for viewing my work. A greeting for you!
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jackssmirkingrevenge
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Thu Jun 16, 2022 9:27 am

Is it my impression or did you use balsa wood in the construction?

You can always tell when a spudder is also interested in model aircraft :D
hectmarr wrote:You have to make many weapons, because this field is long and short life
hectmarr
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Thu Jun 16, 2022 9:33 am

Not in this case because the gun is a bit heavy about 3.4kg... I used 3mm tri-ply wood with a layer of thin fiberglass on the inner side, and screwed to the metal. In other models yes, I have used hard balsa because the weapon is very light.
hectmarr
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Thu Jun 16, 2022 9:40 am

Speaking of this weapon, this is version "2". The number "1", it is valveless... it does not have any valve. I am trying to seal the chamber directly with the pellet in the barrel. The pellet is "prepared", it has a bit of spelling corrector to increase the seal, (it's perfect), and increase the friction at the beginning of the barrel. As it is a plastic material, it works surprisingly well, because it conforms to the shape of the grooves and fits closely to the firing barrel. I have tested up to 30 bar and it does not move from the barrel, but the explosion at no less than 7X releases it and the hybrid can fire without a valve. It is a particular solution for my pellet guns. I have tried it in .22 and . 25. I have to make a post about it.
Last edited by hectmarr on Tue Jul 05, 2022 11:10 am, edited 1 time in total.
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jackssmirkingrevenge
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Thu Jun 16, 2022 10:19 am

Very interesting (and creative use of Tippex!) and good that you made it work!

I had done some experiments with lead projectiles sealed in a breech when playing with hybrid cartridges, metal on metal there were no leaks and it worked to about 8x if I recall correctly.
hectmarr wrote:You have to make many weapons, because this field is long and short life
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Thu Jun 16, 2022 10:34 am

It is a very simple and not exact way to retain mixture at low pressure, enough to fire later.
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Tue Aug 02, 2022 5:10 pm

Adapting this weapon to shoot with rupture disk. It gave me more power and regularity in the shots. I love plain old bursting records...
I am using aluminized paper. I'm using two layers, which work fine for 9X of precompression that the hybrid has.
The face that is made of paper itself is faced and glued with non-wetting glue (glue stick), and the aluminum faces are towards the outside, so as not to be affected by ambient humidity, which in my place is a lot. .
As it is a shotgun, I did not make cartridges, the pellet is simply glued to the sheet of double aluminum foil that is the material of the rupture discs, and it is cut with this tool. The center is the guide and the largest tube is the one that cuts the disc and they are finished.
For gluing the pellets I am using spray contact glue which is quick to use and can be put on the entire sheet, (for about 50 rupture discs).
It is easier to have the pellet and the disc as one thing, but without a cartridge, without a doubt. The good thing is that you do not have to make 20 or 30 cartridges, unnecessary for this weapon that fires one at a time.
I am using 33 gr .25 caliber pellet. The force of the shot is quite important, at 9X, I can pierce 0,7 mm sheet steel.
20220802_183201.jpg
mm sheet steel.
20220802_183226.jpg
Sacabocado discos ruptura.png
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hectmarr
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Tue Aug 02, 2022 7:49 pm

The "cartridges" that includes the rupture disk, seal o'ring and the pellet is as in the drawing. In case of planning a repeating or semi-automatic weapon, with an ammunition magazine, it is necessary to build many.
Cartucho balines copita.png
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jackssmirkingrevenge
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Tue Aug 09, 2022 7:02 pm

I can pierce 0,7 mm sheet steel
That's quite impressive for lead pellets to be honest.

Have you tried with more than two layers of foil?
hectmarr wrote:You have to make many weapons, because this field is long and short life
hectmarr
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Wed Aug 10, 2022 9:05 am

jackssmirkingrevenge wrote:
Tue Aug 09, 2022 7:02 pm
I can pierce 0,7 mm sheet steel
That's quite impressive for lead pellets to be honest.

Have you tried with more than two layers of foil?
No, I'm just using the gun with two rupture discs. Surely you can break three, with a little more precompression load, I estimate with 10 - 11X. At present it is set to 9X. I think that with the energy he currently has it is enough to play at home, without a doubt, with more pressure he will become more dangerous.
This model can shoot with 5 or 6 pumps, which is two power levels. Despite being only a pump difference is noticeable when shooting.
The only thing that doesn't convince me is that the "skirt" of the pellet is "welded" to the target plate, it doesn't pass, only the "head" of the pellet passes to the other side... look at the photo.
20220810_000325.jpg
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