Single pumping hybrid, "Strong Boy"

[Moonbogg]

This thing is just awesome. You have the only semi-auto hybrid and pump action hybrid on earth, that I am aware of. I don't think anyone has ever made either of these principles work before. You've made significant contributions to the hobby and that's rare.

[hectmarr]

This thing is just awesome. You have the only semi-auto hybrid and pump action hybrid on earth, that I am aware of. I don't think anyone has ever made either of these principles work before. You've made significant contributions to the hobby and that's rare.

jajajaja thanks colleague! The truth is that I only do it because I find it very interesting, and I enjoy doing tests with all these little things. Maybe someone other than me, can serve my experiences and can take the post and improve with new ideas all this, or maybe not, you never know ...
I will make the video when I can, there is just no one to give me a hand with the camera, (I don't have a tripod and it is difficult for me to do it alone). I leave a photo of the prototype with the handle, where the gas and the sparkle is housed. The prototype is just to prove the concept. I plan to redo everything, at some point.

[hectmarr]

A few shots of the prototype, and every time I like it more for the simple. The third shot, failed, was intentional, (I did not clean the combustion chamber), so that they see how a case like this is solved, simply by charging gas again.
I am planning something more neat and with a longer barrel, to do penetration tests. The video prototype is compressing at about 3.5-4X. The new one I am building, should reach 8X, and the barrel is will be in the future prototype, 22 cm.
[youtube][/youtube]

[Moonbogg]

That thing is cool! Never seen anything like it. Nice work.

[hectmarr]

That thing is cool! Never seen anything like it. Nice work.

Well, I'm glad you like it. Everything has to be improved, and I have been thinking about improving the design 8) This was a proof of concept, successful, by the way.

[Moonbogg]

Another thought I had was to make a break-barrel design like a spring-piston air rifle. You could get a lot of leverage that way. It could be an under-lever design instead of the barrel breaking down. Massive leverage for high mix pressure!
Hmm, generally speaking, I wonder if a pellet gun (either lever action or pump style) could be modified for hybrid use.

[hectmarr]

Another thought I had was to make a break-barrel design like a spring-piston air rifle. You could get a lot of leverage that way. It could be an under-lever design instead of the barrel breaking down. Massive leverage for high mix pressure!
Hmm, generally speaking, I wonder if a pellet gun (either lever action or pump style) could be modified for hybrid use.

Adding a force lever would undoubtedly give more pressure, and the hypothetical weapon would look like a spring weapon, as you say. I think it could be done, a matter of trying.
When moving the piston to compress the mixture, a strong block is necessary, similar to the conventional trigger system.

[jackssmirkingrevenge]

Great to see it in action! Brilliant idea and execution, as we have come to expect from your stable and there's something quite nice about a single stroke of raw muscle power providing the compression.

[hectmarr]

Thanks Jack!
It is the simplest hybrid that can build, within what I do, small things. A force lever can be incorporated, but to achieve 7 - 8 bar, which is what I usually use, it is not worth the complication, which is not really such, I mean it is unnecessary
I am building the other alternative, with a small external dispenser, which releases the barrel in its length. It will surely lower the noise and have more energy, apart from the fact that I will increase the compression pressure significantly.

[hectmarr]

Finishing manufacturing the design 2. The barrel length was 22 cm, which is an old barrel of smooth bore .25 caliber that was unused. I tried it on the work table at 5 bar, and cleanly drilled a can and almost another. Obviously, the longer barrel, apart from drastically reducing noise, adds speed to the steel bb.
The dispenser is "microscopic", and delivers 2 cm3 of butane, it works perfectly.
On the other hand I made the crank with the winch, but it went a little wrong. The idiot did not look at the plane I made and left the crank joint at right angles (red arrow in the photo), being necessary there to turn with a radius of curvature of at least 7 mm to not concentrate the efforts at that point . After the traditional holidays, I will try to make it manufactured again.
The construction is cleaner and seems to me a better idea than the other version, because in this new idea, the barrel has no limitations in terms of length, and the size of the doser is not a problem. I have added a check valve for the hybrid to suck the mixture. The retention at o´ring no longer lets air in from the barrel into the combustion chamber. Load one 40 cm3 of air.
Another improvement is that the ignition is removable, and it is not necessary to remove the piston to clean it, if necessary.
I am manufacturing the wooden stock, to put the gun on top. When the work is finished I will upload the photos.

[hectmarr]

The Stong Boy II, is finished building, and I have already tried it, with success. :bounce: It works great, and I think it is the best of all the weapons I have built, for the simplicity of operation, reliability, and energy, depending on the understanding you have, which is not much. You just need to paint it and add the boost.
I am comparing it, (without pretending to have any scientific rigor), with a CO2 gun. I think that the Strong Boy has overcome it, in terms of operating economy, it is not necessary to carry anything or carry a co2 bottle, etc. As for the power, they shoot the same. The 1/4 "steel bb are harder but lighter than the pellets .22 of 16 gr. Both perforate a can and almost another, 7 mts. The noise of the strong Boy is almost half of the other gun to co2 As for autonomy, my gun can fire about 80 times, with the butane tank, (disposable cigarette lighter), loaded.The commercial co2 gun fires no more than 12 times, and you have to reload gas carbonic The weight is less than half ... the co2 gun weighs 1800 grams, the one I made, 800 grams.
Moreover, the production cost of my weapon is many times lower than the commercial gun, and apart from this it is safer.
The comparison tests were carried out with a high ambient temperature of about 35 ° C (we are here in summer), with obvious advantage for the co2 weapon.
The Strong Boy has adjustable firing power, because it is enough to anchor a few millimeters forward or behind the bolt handle, to achieve more or less pressure from the hybrid. This, combined with the variable retention of ammunition, gives you flexibility in use, which the commercial pistol to co2 does not have. The entire weapon must be disassembled to modify the hammer valve to vary the power ... In the Strong Boy, you just have to loosen and adjust a screw, and you can shoot between 3 and 7 bar. I am using it at 4.5 bar at present.
In the future I will make a video of the comparison. The possibility of improving this weapon remains open, adding an ammunition loader, and automatically loading gas. The idea is to make the operation a repetitive weapon. I am making some diagrams about this, and it seems perfectly possible.The advantage of the co2 gun is precision, because I understand that the BBs are more impressed over long distances. It is possible to use cup pellet, with an adaptation that I have thought. It is also possible, if necessary, to use a force lever to increase understanding, aspects that can be incorporated into the project. I try to go from the simple to the complex. The year 2020 will be the temporary setting for all this.
I leave some photos of the finished weapon without painting.

[Cthulhu]

I'm really impressed by this! It's such a nice sleek design!
How did you make the O-ring that seals against the projectile and what stops the compression from the piston from pushing it past the o-ring?
How does metering work with that cut down syringe?
I can't wait to see more of this!

[jackssmirkingrevenge]

Fantastic work as always!

[hectmarr]

How did you make the O-ring that seals against the projectile and what stops the compression from the piston from pushing it past the o-ring?

The o´ring is compressed against the nut seat, by the screw. Look at the drawing. The more you press, the sphere needs more strength to escape, and in this way you can regulate precisely how much retention you want to do. The selection deñ o´ring must be exact, so that it enters right into the accommodation. I use accessories for gas connections, 1/4 "or 1/8" bronze. They work without any modification.
When the o´ring cannot be expanded, when the screw is tightened, (well lubricated to slide), the center closes. All regulation occurs, in 1/4 turn once you press, from letting the ball escape almost freely, until when you shoot it does not come out.

Fantastic work as always!

Thanks again!. I am in love with this weapon, I am enjoying it very much.
The dispenser works as in the drawing. You can use a syringe or better a piece of hose that has the necessary internal volume. The gun I show here has 40 cm of hose 4 mm outside diameter, (used for around compressed, polyurethane). In this case, 21 cm of this hose is equivalent to 1 cm3, and the inner diameter is 2.5 mm.
The weapon, when the piston moves backwards, produces a vacuum and sucks.
I wish you a happy start to the year 2020. :bounce: :bom: :bounce: :blackeye:

[hectmarr]

This is the basic idea for the weapon to incorporate the ammunition and load the butane with the action of moving the bolt.
The relative movement of the rod and of the inner tube, allows to obtain an inner displacement, of the rod with respect to the tube where it has a grip on the crank. The pressure generated forces the spring to compress.
The neodymium magnet is responsible for fixing the ball that is entering, so that two do not enter the weapon.
The tube that houses the bb's, supports the combustion pressures, and I plan to build it strong. It solves the "problem" of a depressurization valve, if the trip fails, without the need to add an extra check valve. Just by opening the ammunition tube, the weapon loses pressure. Logic that the screw cap has a hole that lets the air out BEFORE the cap is completely unscrewed, to prevent the balls of the magazine tube from escaping outside.
The displacement of the stem, (in black in the drawing), also serves to open and close the butane valve. The drawing of how the small 3-way and two-way valve that butane passes through is still pending, so that the concept is well understood
It is a first idea that will already be modified. I would like to know what they think, and what other options they see.