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Homemade bullies

Homemade products for hooligans. All about slingshots, shooters, scarecrows, tubes, crackers, school wars, etc., etc.

  • Created by October 27, 2010
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Project "Turkey" | Topic Author: Anamaya

| Topic Author: Anamaya

Zdarova, man.
I spent two months this summer vacation, and all this time I was engaged in pneumatics.


Firstly, it is worth mentioning the direction of my developments.
rate of fire, accuracy, reliability - I decided not to touch all these characteristics, but directed all my engineering power to achieve the greatest power.
pneumatics can be of various types. I will not be lazy and will tell in more detail.
well-known air-fractures, or as they are scientifically called spring-piston pneumatics (SPP). when fired, the piston begins to move along the cylinder, forcing pressure in it, which in turn begins to push the bullet out of the barrel. this type of pneumatics is very common due to the simplicity of its design. most air vents of this type are low-power, but there are very strong representatives of spring-piston pneumatics (Hatsan 125).
the next type is PCP pneumatics (pi-si-pi). She has a built-in cylinder, which is pumped a lot of a lot of air. usually in factory "scribble" the pressure in the balloon is about 300 atmospheres. a full balloon is usually enough for many tens of shots. once I found on the Internet a home-made PCP pneumatics, made not by schoolchildren, I’m adult uncles whose hands grow from where I need to. in that air balloon again pumped up to 300 atm. and it was enough for 400 shots (.). This type of pneumatics is characterized by a high rate of fire, and if you turn to Wikipedia, it will be mentioned there that some air-strips of this type have an initial bullet speed of up to 450 m / s (this is a lot for pneumatics). but unfortunately I did not find a single PCP pneumatics on the Internet with the same indicator that exceeded 350 m / s.
the next type of pneumatics is gas cylinder. most often presented in the form of pneumatic pistols. The operating principle of such pneumatics is very similar to PCP, but instead of ordinary compressed air, carbon dioxide contained in the can is used. usually one spray is enough for 50 shots, after which it is replaced with a new one. such pneumatics are not very different in power. Yes and anything else. (a toy as for me).
and the last type of pneumatics that I will tell about is compression pneumatics. in such airs there is a built-in pump, which makes one pitch, after which a shot is fired. to shoot again, you need to pump the pump again. there is also multi-compression pneumatics (MK). here you can already do a few pump strokes. but after each shot, you need to download again. power depends on the number of strokes. you can swing 1 time and knock down the jar with a shot, but you can swing 10 times and right through the hole to drill the duck along: 0
this type of pneumatics has a very low rate of fire, but there is a huge potential for power. therefore, I began to do precisely MK pneumatics. We turn to the review of the first model.

Pavlenti (Bhaumi) MODEL 1.0 SIZE OF BALON

Initially, I did not really understand that for a single shot, not so much air is needed. main pressure. and the larger the volume of the cylinder, the more air and the longer it must be pumped to achieve the desired pressure. In this regard, my first model, Turkey 1.0, was made from a bottle from a potato sprayer against pests. she was bulky. it could not be held in her hands. although, in appearance, it looks mighty (well, it seems to me), but in fact, in order for this nonsense to spit something out of itself at least a meter, it was necessary to make a pump 100+ strokes: 0 it took more than 2 minutes to charge. Moreover, this gun was not mobile.
pictured air without a barrel. a wooden handle with a pin is a release valve. you hit the handle down, and a bird flies out of the barrel.
this model 1.0 was far from my ideal.

Pavlenty (Bhaumi) MODEL 2.0

after unsuccessful tests, I decided to change everything drastically. The turkey 2.0 model was much more mobile, although it was necessary to carry a pump attached to the hose. here I decided to sharply reduce the volume of the balloon. in this model, it was approximately 180 ml and was made of an aluminum pipe. the photo shows that a nipple is sticking out of the balloon. After testing, it was found that it was simply impossible to pump the balloon normally through the nipple, so I had to tear off the nipple and directly connect the pump. that is, the air was inseparable from the pump, which significantly reduced its mobility.
power. Yes, the power was up to par. punched 2 - 2.5 cm of wood with a nail, an iron cover with a drill. but I would like more :)
the trigger remains the same. I had to beat the handle on top, which is not very convenient. and if you shoot from a distance of more than 5 m, then it’s generally impossible to get anywhere (haha)
a shutter was also made for popping shells. free assistant helped me with photos.

Pavlenty (Bhaumi) CALIBER

the caliber of my air was 9 mm. By the way, the caliber of most factory air guns is 4.5 mm. the large caliber somehow upset me, because more air was required to push out a large-caliber projectile, and therefore it was necessary to pump more. I told my friend about my problem. he successfully joked that if I reduce the trunk, then my air will then shoot the trunks themselves. during that conversation, I thought it was absurd. I did not know what would happen next.
Most of all I liked to shoot with drills. they have one very good plus. due to the fact that they have helical geometry, they spin in flight, thereby becoming more stable in flight. during the experiments, the drill never crashed flat. if you take a powerful factory pneumatics or even combat rifles, then the trunk is cut there. due to which the bullet passing along the barrel begins to rotate. significantly increases the range, accuracy, stability of the bullet in flight. something, but I definitely can’t cut the barrel in my workshop :( you need a special machine for this. But shooting with drills slightly compensates for the lack of a cut barrel due to the fact that the drill itself is as if cut.

Pavlenty (Bhaumi) MODEL 2.1 AND 2.2

The next stage in the evolution of my pneumatics was an even greater reduction in the volume of the balloon. in model 2.1 (no photos of this model were preserved), its volume was approximately 100 ml. if in model 2.0 it was necessary to do 8 pump strokes (then there simply aren’t enough forces), then in model 2.1 you need to do 6 pump strokes to the maximum. the power is the same. and here was a problem. if I can’t pump anymore. I mean, 6 strokes - this is the maximum: (everything. It’s more powerful not to do the air anymore - I thought and became discouraged and upset. For several days I suffered from a creative crisis, I thought that everything was lost, there wasn’t any sense in this life until I thought one thought struck. according to Pascal’s formula (or whatever it is): the pressure is equal to the force divided by the area, we can conclude that the smaller the piston of the pump (that is, the cuff, that is, the diameter of the cylinder), the easier it is to pump the pump. (I could have done better paint everything, but I won’t bother whoever wants to, he will understand). it dawned on me: you need to throw away the factory manual pump and make your own with a smaller cylinder diameter. which I actually did. after several unsuccessful attempts to make my own "high pressure" pump, I still got this: D
the pump was 90 cm long and could pump a little over 15 atmospheres. Pavlenty rejoices. development continues. The next model of my 2.2 air was already with a built-in pump and an even smaller cylinder. now the volume of the can was approximately equal to 50 ml.
I could do 5 pump strokes (I didn’t master further), but that was enough to break more than 3 cm of wood with a pump. a breakthrough was made. the power increased, and the recharge time decreased (from 6 to 5 strokes). cheers, comrades. pictures of model 2.2. are attached:

Pavlenti (Bhaumi) MODEL 2.3

If you look at the pictures of Turkey 2.2, you can see that the pump and the cylinder at it is perpendicular to the barrel. It is very uncomfortable and not beautiful. fie. it was necessary to somehow make this whole thing more compact. After thinking a bit, I decided to go to the store and buy there 2 water corners. these are perhaps the only 2 things i bought. yes, yes, reader. all the air, except for these two corners, is collected from the trash that I found next to the house (well, or in the house). having bought these two nonsense, each of 70 rubles (140 rubles. Yes, I will go broke like that) I made the barrel parallel to the pump and spray. like that. This is model 2.3.

Pavlenty (Bhaumi) MODEL 3.0

After experimenting with Turkey 2.3, I realized (it’s strange why not right away) that I have to exert great effort to open the trigger valve, that is, to shoot. After all, the trigger mechanism remained the same primitive: you hit the pin that pushes the valve with your hand. you had to do something about it. after watching all sorts of videos on YouTube about home-made PCP air vents, I noticed that they all have a drummer (chipper. I don’t know what it's called. pff). In general, I decided to make a drummer.
there was a problem. I used to do without a bed, I did not need it. but if you make a drummer, then it should be fixed behind the trigger valve. that is, I needed to make some kind of frame to place everything on it.
having climbed the mountain "construction Olympus" and having come there to the master Ivan (my dad), I asked him. board. yes thicker. he gave me access to a pile of boards, and having scattered a bit with my brain, I decided to take an oak board (strong oak). to take an oak tree was my mistake. if I took a pine or linden, then I would have made a bed in one day, and so I spent 3 days fumbling with an oak board, hollowing out something similar to a bed from it. after soft processing, it began to look pretty good.
the drummer has a lever that you need to pull to cock it. after that he remains in a tense position. to shoot you need to press the lever up on the outside of the thumb of the right hand. it slides from the step and from acceleration (under the action of the spring in it) will hit the valve. he cocked heavily (meaning powerful), but if you make more than 4 pump strokes with a pump, the drummer often does not bother to open the valve. it’s very bad, because, I’m afraid, I won’t do the drummer anymore. Introducing Turkey 3.0:

Pavlenty (Bhaumi) FIELD TESTS MODEL 3.0

I have done many tests with this model. Unfortunately, a few photos were taken, since then I had not thought about the fact that they would be needed and that my air-box would still undergo big changes.
let's move on to testing.
It is worth saying that as a rule my shells always have some kind of restraints: nails have hats that do not allow them to enter the target anymore, the drills have a thick layer of electrical tape at the end so that it fits the caliber. in this regard, the shells, although they had a great penetrating ability, but did not always pierce their targets for relegation. however, such targets as cans and coffee cans they sewed through from both sides and even two cans per shot.
I like to measure wood penetration. Model 3.0 hammer a nail 3 - 3.5 cm. Excellent. I also had a hollow brick from the heater. firing a drill at him, I got a complete breakdown of one side. it surprised me. punching 1.5 - 2 cm of brick - I really like it. the power is excellent. after shooting all the cans and losing all the drills, I decided to make ultralight traumatic bullets from potatoes, and later from beets. at first I wanted to shoot potatoes at people, but after testing on plywood, I realized that even potatoes can cause serious harm to humans. by shooting potatoes at plywood, I was stunned. a small piece of the root crop pierced the plywood: 0 while the projectile scattered into molecules (this is a figurative expression like this).
I also decided to play a little with plasticine, namely to shoot at him and look at the traces of hits. and now fotochki:

Pavlenti (Bhaumi) MODEL 3.1 DIMENSIONS

it would seem, it's time to finish the project, everything is fine, the power is excellent, but I was not very happy with the size of my Turkey. the total length of the air was 148 cm. Moreover, it had to be pumped. after the pump rod was extended, the air length increased by another 80 cm. That is, this nonsense was already under 2 meters. it was uncomfortable to pump, the pneuma was heavy. there is power, but I would like to see it in a more compact mode. I decided to take a desperate act: shorten the total length of the air. First of all, it was necessary to shorten the pump, the length of which was 90 cm. Then it turned out that my barrel of 9 mm caliber and 87 cm long was longer than the pump, so it became impossible to pump air. I was sorry to shorten the barrel. I’ll never find such a pipe anywhere (a stalk from a mop). I decided to take a pipe from the curtain. I will have 5 meters of these pipes. the barrel was made 50 cm long. Accuracy at a great distance will naturally decrease, but since I had no sight and was aiming stupidly at the eye, at the barrel, there was plenty of accuracy with a 50-centimeter barrel. caliber also decreased. Now it is 7.5 mm. and since the caliber is smaller, the bullet speed will be greater. I also shortened the balloon a bit. its volume became approximately 30-40 ml. after all the modifications, I put together a model 3.1 and got a total length of 126 cm. That is, it became shorter by 30 cm than the previous model. having completely redone the stem for the pump, namely by making it out of an aluminum tube instead of an iron pin, I significantly reduced the weight of the air. Now it has become lighter and more compact.
Remember, I was talking about a joke about shooting trunks? and so, after some shots the barrel just flew out of the trigger tube .. if it weren’t for the handle on the barrel, it would fly completely out of the air. This is no longer funny: I had to use a stiffer shutter, which slightly reduced the convenience of closing it.
what about power? power. she decreased: (decreased significantly: ((
Now the board pierced with a nail no more than 3 cm (within 2.5 - 3 cm). I was upset. but the work of shortening the pneuma was already done and nothing could be returned back. I decided that such power is also quite decent.
as for the pump, now the maximum could be rocked 8 times (instead of 5). the rate of fire thereby fell. I was not very upset, because the pump became smaller and more convenient, it was possible to compensate for the recharge time by fast pumping.

Pavlenty (Bhaumi) Hatsan 125

I will make a small digression.
The most powerful air gun I have seen on the Internet is the Turkish spring-piston Hatsan 125. According to the manufacturer, the initial bullet speed at it can reach 380 m / s. let's make a comparison.
bullet speed at:
Makarov pistol - 315 m / s
TT pistol - 420 m / s
AK-47 - 715 m / s
SVD - 830 s / m
Mosin Rifles - 870 m / s
T-90 tank - 1700 m / s
with the latest electromagnetic gun in Russia (railgun) - 5500 m / s
: D
someone may have noticed that Makarov’s bullet speed is much lower than that of Hatsan’s. but the air mass of the bullet is 0.5 g, while that of Makarov is more than 6 g here and the hidden energy of the gunshot lies. although Hatsan has a high initial bullet speed, the muzzle energy of this air is only 33 J, and that of the Pistol Makarov is 300 J. 10 times more. but there is a big BUT: when hunting small game (duck, bunny) there is nothing better than pneumatics. Hatsan can pierce a duck through, this is more than enough to fill it up. In addition, pneumatics have very low recoil and shot noise.
a few words about muzzle energy. According to the law, pneumatics cannot be more powerful than 25 J. Hatsan has 33 J. The law is circumvented this way: when buying in air, there is a weakened spring, due to which the power drops to the allowed one (25 J), and a reinforced spring comes with Hatsan. the buyer at home or with the help of a master changes the weakened spring to a stronger one and receives 33 J. like this.


Turkey version 3.0 was the most powerful. but because of its length and mass, it did not become the conclusion of this project. I decided to achieve increased power by improving the quality of some parts. чисто 1 день я потратил, пытаясь сделать хороший спусковой клапан, который открывается когда надо, закрывается когда надо, практически ни сколько не травит и не ломается после 2-3 выстрела. разработка секретная, фотографировать не стал. потом я доработал сам спусковой механизм, сделав его более качественно и удобно. появился нормальный спусковой крючок. теперь не нужно было оттопыривать рычаг на отбойнике большим пальцем. так же я попытался более качественно соединить насос с баллончиком и со спусковым механизмом.
ложе было покрашено в черный цвет. внешний вид получился довольно годным. красота :D

Павлентий (Bhaumi) еще фоточки:

Павлентий (Bhaumi) и еще:


my air rifle is finished. This is the final version. which means it’s time to carry out penetration tests, as well as take measurements of the initial velocity of the bullet.
shells are made of nail (150 mm). bullet weight 6 g.
the tree breaks through an average of 3 cm. (Yes, the 3.0 model was more powerful).
tin cans, coffee cans and paint cans are tearing through from both sides, even despite the limiters on the bullets.
pierces one side of the bucket and gets stuck due to the stopper.
in experiments with beets (replacing potatoes) it was found that root plywood can no longer be pierced. this was due to a decrease in power and caliber. (before potato bulbs were larger).
short shells from a nail get stuck in a two-centimeter board because of the limiter a little showing up from the back.


and so, guys, measuring the speed of a bullet without a chronograph. drove off.
At first I decided to take measurements in an acoustic way: you record the sound of a shot and the sound of a hit on the recorder, then on the sound editor you watch how much time has passed between these two sounds, divide the distance from which you shot for the time you received and get the speed. it seems simple - I thought, and spent more than 20 measurements. the results were too different from each other. somewhere they were underestimated (I thought so), somewhere they were fantastic (I got more than 2000 m / s on two measurements). apparently I don’t know how to use the sound editor (pfff). I decided to quit and started measuring speed using a ballistic pendulum. the principle is this: a suspension (taftalogy) is hung to a certain height, which you need to shoot at. the bullet should be stuck in the suspension. after the shot, the bullet transfers energy to the suspension, because of which it comes into motion, moving the slider in front of itself. after which the distance the slider has moved is measured. a cunning formula is taken and the speed of the bullet is calculated.
for all this fraud with a pendulum, I needed to know the exact mass of the bullet and the mass of the suspension. I had no weights .. had to do .. lever. it turned out to be quite suitable scales, capable of measuring the load with an accuracy of plus or minus 3 g with a large weight and with an accuracy of a gram with a very small weight. in contrast, I poured water with a syringe. since the volume of water is numerically equal to its mass (that is, 10 ml = 10 g).
Having learned all the necessary parameters, I proceeded to measure the initial speed of the bullet.

Pavlenty (Bhaumi) RESULTS

I shot two types of shells: beetroot bullets and nails.
To begin with, I did not take a steam bath with the accuracy and purity of measurements. spent more than 20 measurements and. horrified: 0 bullet speed when firing beets reached 382 m / s. but .. to reach such a speed, it is necessary that the air be heated. but in my air it heats up nothing, and I shot in the evening: there was no sun. what is it ... it cannot be. I decided to reject the results and do it all over again.
refined measurements were made. all the next day I just did what I tried to achieve the greatest accuracy. changes and scales, they became more accurate. it turned out that my suspension weighs 20 g less (this is not so much, but still). I also tried to take into account many factors, including the time of day. and not in vain! after calculating the speed of the bullet, it was found out that at night the air gun shoots a little weaker than during the day. apparently due to lower air temperatures in the dark.
more than 40 specified measurements were carried out.
First, I’ll tell you about a nail bullet, the mass of which was 6.5 g (plus or minus 0.3 g).
the initial clove flight speed varied from 48 to 56 m / s. it seems that a little? still breaks the bucket.
let's see what with the shells from the root crop.
I measured the bullets in groups of 20-30 pieces and divided the resulting mass by the number of bullets. So the average weight of one bullet was 0.44 g.
the initial velocity of the bullet was 173 - 195 m / s.
it’s impossible to kill anyone. sorry like that. and in flight, due to their irregular (almost square) shape, they quickly lose all their power. if you shoot at an aluminum sheet from 5 meters, then distinct dents from beets form in it, and when shooting at the same sheet from a distance of 20 meters, there is only a wet place. I was not upset by this, because the whole thing is in bullets, and not in the air itself.
I want to note that the air rifle was made quite powerful, but still did not exceed the power of the world's most powerful factory air gun Hatsan 125. Just do not forget about other characteristics. the reliability, accuracy and, especially, the rate of fire of my pneumatics leaves much to be desired. Yes, I can easily get into the aluminum sheet 0.5 by 0.5 m from a distance of 20 m, but the accuracy should be much better. as for rate of fire. I did not take measurements on this subject, but if you look at the eye, it turns out about 15-20 seconds per shot .. hmm .. I thought there would be much more.
In general, I consider my work to be quite suitable and successful.
to all who read many thanks. you can like this message, purely so that I know that someone has read it, as well as right here you can leave your comment, question, criticism. or if you find any jambs, then be sure to write about it.
next time we’ll do something more powerful than Turkey Turkey: D
all beaver.

Tags: How to make air from the pump at home