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Hybrid pumped weapon project

Posted: Sat Apr 30, 2022 6:19 pm
by hectmarr
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 3.5 ml.
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

Re: Armadas 1500 II (hybrid pump rifle)

Posted: Wed May 04, 2022 2:25 am
by Moonbogg
That is really clean and very nice. I love that it's a hybrid. So awesome. Nice job!

Re: Armadas 1500 II (hybrid pump rifle)

Posted: Sat May 07, 2022 7:29 am
by Anatine Duo
Sick! Looks very well put together. Inspiring actually!

Re: Armadas 1500 II (hybrid pump rifle)

Posted: Sat May 07, 2022 10:45 am
by hectmarr
Thank you so much guys! :)

Re: Hybrid pumped weapon project

Posted: Thu Jun 16, 2022 9:14 am
by jackssmirkingrevenge
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

Re: Hybrid pumped weapon project

Posted: Thu Jun 16, 2022 9:23 am
by hectmarr
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!

Re: Hybrid pumped weapon project

Posted: Thu Jun 16, 2022 9:27 am
by jackssmirkingrevenge
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

Re: Hybrid pumped weapon project

Posted: Thu Jun 16, 2022 9:33 am
by hectmarr
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.

Re: Hybrid pumped weapon project

Posted: Thu Jun 16, 2022 9:40 am
by hectmarr
20220616_115007.jpg
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.

Re: Hybrid pumped weapon project

Posted: Thu Jun 16, 2022 10:19 am
by jackssmirkingrevenge
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.

Re: Hybrid pumped weapon project

Posted: Thu Jun 16, 2022 10:34 am
by hectmarr
I've tried nail polish too, but it messes up the barrel a bit. The concealer seems to work very well, and it dries very quickly. I have tried (photo), painting the entire pellet, only the skirt, and one or two coats of corrector. What works best is a single coat of corrector and only on the skirt of the pellet. All this was a lucky "mistake", to which I am usually very attentive, because I forgot to close the valve to the o'ring of the gun and it compressed and fired perfectly... immediately afterwards I removed the valve and prepared the pellets with corrector and it fired better than with the valve. As I mentioned, it is a partial solution to a hybrid of up to 10X and .22 and .25 pellets. With heavier pellets (33g in .25 caliber) shoot directly with the pellet, because these barrels I bought are VERY tight to the pellet.
What you say about your metal-to-metal seal tests, if one of the metals can be deformed, the seal is good. In my case, the 33 gr pellets cannot be inserted by hand because it is too much force... if with the needle anchored in the body of the bolt and enough pressure for it to penetrate. What is essential and expensive is that the pellets have to be of good quality and expensive around here. With the technique of painting them with corrector, you can use the common ones, and not so heavy.