Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 26 users online :: 4 registered, 0 hidden and 22 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Cthulhu, Exabot [Bot], Google [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Autonomous hybrid IV

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
Sponsored 
  • Author
    Message

Autonomous hybrid IV

Unread postAuthor: hectmarr » Wed Mar 20, 2019 8:58 pm

This is the project that I am working on. It is the prototype 4, of the series of autonomous hybrids.
I plan to introduce improvements, in several aspects.
The dosing unit will be activated by the piston rod of the combustion chamber, just like in my semi-automatic hybrid. In this case, the solenoid valve 5/2, cleans the combustion chamber of burned gases and injects the combustible gas into the doser, at the same time, leaves everything ready to load the ammunition and pump the air.
The air pump will be of two stages, double acting and lever. It is finished, and it works very well. It is smooth to operate and in 5 cycles it will fill the combustion chamber to 9X.
The caliber is 6.35 mm, it shoots diabolos, I already bought the barrel with 12 micro striations, 24 "long.
The ammunition loading system will be the same as my HA -3, which has been tested quite a lot and works perfectly.
The high-pressure check valves, I have made them myself, are two, the mixing feed and the output of burned gases. The latter is operated by a small pneumatic actuator incorporated into the weapon.
The combustion chamber has a new spring, of better quality than the previous ones, to retain the mixture of air and butane. In theory it can hold up to 15X without uncovering the gas outlet orifice. The two high pressure valves, are located in the head of the weapon, where it has the ignition, which will be a piezo igniter of those used in domestic stoves and ovens, have worked very well all (I have 8).
I put here, some diagrams and some photos of what I'm building. Some images and diagrams have already been uploaded previously, but it seems better, so that everything is clearer, put everything together here.
This time, I will try to document the design and construction of the weapon, because I have always built tested and last, showed my works. I will update everything on the HA 4 right here. :)
  • 3

Attachments
Caño y cerrojo, abierto.JPG
Caño y cerrojo, cerrado..JPG
Válvula de retención alta presión.JPG
HA IV camara combustión.JPG
Bomba aire a palanca de 2 etapas y doble efecto.JPG
Bomba de aire a palanca de 2 etapas y doble efecto (2).JPG
Cámara combustión PARA SERIE HÍBRIDOS AUTÓNOMOS 1,2,3 Y 4.png
Dosificador volumétrico simple HA 4.png
Bomba de aire a palanca de dos etapas.png
Unidad dosificadora para híbrido con bomba de aire manual.png
Unidad dosificadora para híbrido con bomba de aire manual.png (35.81 KiB) Viewed 2351 times
HA IV.JPG
Last edited by hectmarr on Fri Mar 29, 2019 7:11 pm, edited 1 time in total.
Weapons do not exist, they are built. This hobby is a science - totally procedural art.
User avatar
hectmarr
Colonel
Colonel
 
Posts: 588
Joined: Sat May 07, 2016 3:49 pm
Location: Yaren
Country: Nauru (nr)
Reputation: 162

Re: Autonomous hybrid 4

Unread postAuthor: Anatine Duo » Thu Mar 21, 2019 4:46 am

I didn't want to admit this, but I am confused as to how this works. Excited... but confused. It's inspiring me to study it...
  • 0

User avatar
Anatine Duo
Sergeant First Class
Sergeant First Class
 
Posts: 130
Joined: Sat Feb 01, 2014 11:16 am
Country: Canada (ca)
Reputation: 18

Re: Autonomous hybrid 4

Unread postAuthor: hectmarr » Thu Mar 21, 2019 9:19 am

Anatine Duo wrote:I didn't want to admit this, but I am confused as to how this works. Excited... but confused. It's inspiring me to study it...

Actually it is not complicated but when you see everything together you can confuse a little.
It is a hybrid weapon similar to a compressed air pellet gun, I mean in the form of a rifle, and it operates as a pumping weapon, (Benjamin 392, Daisy 880, and many others).
Basically you need a combustion chamber, a fuel gas doser, so that the butane-air mixture is stoichiometric, (in the optimal proportions to make it flammable), the air pump and the system for loading and firing ammunition. They are powerful weapons for weight and size, and for the low pressure that is necessary to fire.
If you have any questions, tell me and I'll clarify the subject.
This is a video of model 3, shooting. https://www.youtube.com/watch?v=rquQVvW-vw4
  • 1

Weapons do not exist, they are built. This hobby is a science - totally procedural art.
User avatar
hectmarr
Colonel
Colonel
 
Posts: 588
Joined: Sat May 07, 2016 3:49 pm
Location: Yaren
Country: Nauru (nr)
Reputation: 162

Re: Autonomous hybrid 4

Unread postAuthor: jackssmirkingrevenge » Thu Mar 21, 2019 10:04 am

Great work on the pump! I look forward to seeing it in action :D
  • 1

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25461
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 254

Re: Autonomous hybrid 4

Unread postAuthor: hectmarr » Thu Mar 21, 2019 10:40 am

Thanks Jack! I'm working on everything else, but someday I'll finish the job :)
  • 0

Weapons do not exist, they are built. This hobby is a science - totally procedural art.
User avatar
hectmarr
Colonel
Colonel
 
Posts: 588
Joined: Sat May 07, 2016 3:49 pm
Location: Yaren
Country: Nauru (nr)
Reputation: 162

Re: Autonomous hybrid 4

Unread postAuthor: hectmarr » Wed Mar 27, 2019 12:05 pm

I'm finishing the system to load the pellets. It is built with recycled materials. In the diagram you can see what the construction is like to support the shots. In black, what is metal, and in gray, what is fiberglass and resin.
In the photos, the surface finish of the fiberglass parts is missing. I add a small layer of resin with industrial talc, so that it is smooth, without pores. The dark color is because of the graphite that I used to test everything in a lubricated way. It is the least dirty because otherwise I have to apply grease and it is a scab, especially my clothes.
The walls that are attached to the outer tube, have some obstacles to reinforce everything, this is the parts that have a structural compromise by the forces generated by the pressure. Temperature is not a problem here, because the introduction of ammunition, and the pumping of air, gives enough time for everything to cool, and the accumulated heat is not much.
The element that joins the crank with the firing barrel is recycled from a disused fan. It has a captive screw so it does not rotate.
The ajuga to introduce the pellet a few millimeters inside the barrel, is steel, 2.5 mm in diameter, and leaves enough space for the gases to enter the firing barrel.
What follows now, is to build the combustion chamber, when you have time.
  • 1

Attachments
Sistema carga balines 6,35 mm, HA - IV.png
Sistema carga balines 6,35 mm, HA - IV.png (16.95 KiB) Viewed 2090 times
1.JPG
2.JPG
3.JPG
4.JPG
5.JPG
6.JPG
Weapons do not exist, they are built. This hobby is a science - totally procedural art.
User avatar
hectmarr
Colonel
Colonel
 
Posts: 588
Joined: Sat May 07, 2016 3:49 pm
Location: Yaren
Country: Nauru (nr)
Reputation: 162

Re: Autonomous hybrid 4

Unread postAuthor: jackssmirkingrevenge » Fri Mar 29, 2019 3:23 am

Looking very nice Hector! I'm very interested to see the level of power with a lead projectile in a tight fitting rifled barrel.
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25461
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 254

Re: Autonomous hybrid 4

Sponsored

Sponsor
 


Re: Autonomous hybrid 4

Unread postAuthor: hectmarr » Fri Mar 29, 2019 9:26 am

I think that with steel spheres and an adjustable retention, with an o`ring, the power is greater, or should be.
The problem with a fluted barrel, and pellet, is that the retention that has, which is always the same, that is due to the drag, can not be adjusted with the increase of the force exerted on the pellet, by increasing the pressure, by having more "X" the hybrid.
With 9 or 10X, the retention is small, in relation to the force applied behind the pellet. Here it is important that the pellet be as heavy as possible.
With bb`s spherical, retention can be increased as the force that drives the sphere increases. It's a subject that I have to confirm through tests, but I've already noticed some of this effect comparing pellet and bb`s in the past. We will see :|
It is possible to change the firing barrel, without modifying anything else in the weapon, to use steel balls, if I do not like how it fires. In the end it is less expensive, and I have thought about using balls of 7 mm, 8 mm ,3/8, to have a different caliber this time, and not repeat the already built.
  • 0

Weapons do not exist, they are built. This hobby is a science - totally procedural art.
User avatar
hectmarr
Colonel
Colonel
 
Posts: 588
Joined: Sat May 07, 2016 3:49 pm
Location: Yaren
Country: Nauru (nr)
Reputation: 162

Re: Autonomous hybrid IV

Unread postAuthor: hectmarr » Wed Apr 10, 2019 11:55 am

The component parts that I have already finished, and a picture of what it will look like when it is finished. I need to build the piston and ignition system.

Edited:
Today I manufactured the cover where the ignition goes and the valves, and the piston. They are prepared to be installed in the bank's boiling machine, to make the grooves of the o`rings and to give the necessary exact diameter. I have installed a small bearing on the end of the shaft that is down, to avoid buckling when doing lateral force, when the pieces are rectified and grooved. I will do this work on the weekend.
  • 2

Attachments
HA IV. 2.JPG
HA IV, 1.JPG
Tapa y pistón HA IV.JPG
Weapons do not exist, they are built. This hobby is a science - totally procedural art.
User avatar
hectmarr
Colonel
Colonel
 
Posts: 588
Joined: Sat May 07, 2016 3:49 pm
Location: Yaren
Country: Nauru (nr)
Reputation: 162

Re: Autonomous hybrid IV

Unread postAuthor: jackssmirkingrevenge » Thu Apr 11, 2019 6:40 am

Beautiful work on these, the epoxy-casting technique can provide great results once mastered.
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25461
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 254

Re: Autonomous hybrid IV

Unread postAuthor: hectmarr » Thu Apr 11, 2019 10:30 am

jackssmirkingrevenge wrote:Beautiful work on these, the epoxy-casting technique can provide great results once mastered.

Up to now the polyester and epoxy resin perfectly supports the forces generated in the hybrids up to 8X.
A few days ago, I disarmed the HA III that shoots at almost 8x with which I shot many times, I would say 300 or 400 shots, and the piston and cap that delimits the combustion chamber, where the ignition is located, are in perfect condition. I think the fact of incorporating 80 grams of fiberglass mts2 fabric in the central part has helped a lot, because it gives it more resistance. The o`ring have passed the test with good results, equally. For now I continue with this material, which is cheap and I can work without any problem. I imagine that it can take a little more pressure all this. :)
  • 0

Weapons do not exist, they are built. This hobby is a science - totally procedural art.
User avatar
hectmarr
Colonel
Colonel
 
Posts: 588
Joined: Sat May 07, 2016 3:49 pm
Location: Yaren
Country: Nauru (nr)
Reputation: 162

Re: Autonomous hybrid IV

Unread postAuthor: hectmarr » Mon Apr 15, 2019 8:09 pm

Here are some more photos to illustrate the construction process of this weapon.
The ignition is finished and tested, and the two valves are mounted on the cap of the steel tube head containing the spring and the piston, and have also been tested, it functions correctly :bounce:
It remains to do some things from the bolted system that loads the pellets and little else.
The space between the lid and the piston that was seen in the antepenultimate photo is the size of the combustion chamber. It has a diameter of 32 mm, (the diameter of the steel tube), and 30 mm in length, resulting in an approximate volume of 24 cm3.:)
  • 2

Attachments
Encendido HA IV.JPG
Tapa y encendido HA IV.JPG
Tapa, electrodos y orificios de las válvula.JPG
Tapa delantera con válvulas y encendido, instalados.JPG
Tapa, pistón y resorte HA IV.JPG
Tapa delantera y pistón HA IV.JPG
Despiece válvula de escape HA IV.JPG
Weapons do not exist, they are built. This hobby is a science - totally procedural art.
User avatar
hectmarr
Colonel
Colonel
 
Posts: 588
Joined: Sat May 07, 2016 3:49 pm
Location: Yaren
Country: Nauru (nr)
Reputation: 162

Re: Autonomous hybrid IV

Unread postAuthor: jackssmirkingrevenge » Tue Apr 16, 2019 7:20 am

For someone without "proper" machine tools the quality of the components is superb, bravo!
  • 0

hectmarr wrote:You have to make many weapons, because this field is long and short life
User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 25461
Joined: Thu Mar 15, 2007 11:28 pm
Country: Chad (td)
Reputation: 254

Re: Autonomous hybrid IV

Unread postAuthor: hectmarr » Tue Apr 16, 2019 8:46 am

Thank you! Everything is fine in general. I am thinking of using a piston of the car brake system, which are made of metal and could be adapted. I'm looking at the dimensions of what I can find on these sides, that suits what I need. :idea:
  • 0

Attachments
BCR048.jpg
Weapons do not exist, they are built. This hobby is a science - totally procedural art.
User avatar
hectmarr
Colonel
Colonel
 
Posts: 588
Joined: Sat May 07, 2016 3:49 pm
Location: Yaren
Country: Nauru (nr)
Reputation: 162

Re: Autonomous hybrid IV

Unread postAuthor: jrrdw » Wed Apr 17, 2019 5:13 am

If you have to re-size or adapt brake cylinder pistons I will suggest a very, very sharp clean file. You have made a great choice for durability, these things last for ever. I've rebuilt a boat load of brake cylinders in my mechanical career and the piston cylinder wears out before the piston 99% of the time in my own experiences.
  • 0

Look if you must.
User avatar
jrrdw
Donating Moderator
Donating Moderator
 
Posts: 6716
Joined: Wed Nov 16, 2005 5:11 pm
Location: Maryland
Country: United States (us)
Reputation: 46

Next

Return to Hybrid Cannon Discussion

Who is online

Registered users: Bing [Bot], Cthulhu, Exabot [Bot], Google [Bot]

Reputation System ©'