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Small semi automatic hybrid project

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.
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Re: Small semi automatic hybrid project

Unread postAuthor: jackssmirkingrevenge » Tue Feb 26, 2019 7:51 am

hectmarr wrote:I think that with little gas could stretch the spring that works with traction, in this case.


Just make sure you have a bumper to limit the travel distance, otherwise your poor spring might be stretched out...
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Small semi automatic hybrid project

Unread postAuthor: hectmarr » Tue Feb 26, 2019 8:32 am

Yes, you are absolutely right.
They are all options ... I will try to build it in this way, with the integrated pneumatic actuator. Save space, which is important. This is the definitive design. I leave two drawings to be understood. :D
There is a small error in the drawing. A lock must be added to the slider.
PD:
My wife will be happy to end this topic :shock:
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Sistema carga con retención y actuador neumático integrado 1.png
Sistema carga con retención y actuador neumático integrado 1.png (13.03 KiB) Viewed 1087 times
Sistema carga con retención y actuador neumático integrado 2.png
Sistema carga con retención y actuador neumático integrado 2.png (11.71 KiB) Viewed 1087 times
Actually I'm planning the improvised, and improvising what's planned!
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Re: Small semi automatic hybrid project

Unread postAuthor: hectmarr » Thu Feb 28, 2019 11:36 am

This is how the construction of the loading system with retention for the HA-SA 1 is now.
I have done some tests and the problem is that the pneumatic actuator is sodomized :shock: by the explosion pressure. I mean it makes you go back to the position of "loading" ammo, although not totally. I'll see what simple solution I can produce :roll:
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Re: Small semi automatic hybrid project

Unread postAuthor: jackssmirkingrevenge » Thu Feb 28, 2019 12:05 pm

hectmarr wrote:the problem is that the pneumatic actuator is sodomized :shock: by the explosion pressure.


:D

I love these little translation quirks... in English it would be more common to say "screwed" ;)

Remember that while the effective area is smaller, the pressure in the chamber is a lot higher than your pneumatic actuation...
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Small semi automatic hybrid project

Unread postAuthor: hectmarr » Thu Feb 28, 2019 12:17 pm

little translation quirks...

This time it was intentionally, because that is what the agave does to the piston of the pneumatic actuator! I have felt it that way. :)
Seriously, I'm going to incorporate a small lock operated by the compressed air to lock the slide at the time of the shot, I do not see another exit.
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Re: Small semi automatic hybrid project

Unread postAuthor: jackssmirkingrevenge » Fri Mar 01, 2019 7:34 am

You could almost have a rotating bolt like a real firearm...

Image
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Small semi automatic hybrid project

Unread postAuthor: hectmarr » Fri Mar 01, 2019 9:48 am

Interesting mechanism, and very useful, only that it seems a bit difficult to build.
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Re: Small semi automatic hybrid project

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Re: Small semi automatic hybrid project

Unread postAuthor: hectmarr » Sat Mar 09, 2019 11:04 am

I have finished the new ammunition loading system with adjustable retention, and it has been successfully tested. The energy of the shot increased a lot. On the other hand, it has no gas losses, and it does not get stuck, which is the most important thing. The gas generator is the HA-SA I, updated with the new system.
I have built a new firing cannon, which has been born better than the others. The firing barrel has a length of 20 ", previously it was 17". I shot it 20-25 times and everything ok.
The pneumatic actuator to move the slide is located below the firing barrel, and is more comfortable.
I have not been able to integrate it into the system because the motorcycle shock absorber tubes, 17 mm inside diameter, are not long enough to do so. They have 170 mm of length, and I need at least 220 mm. :x In the future I will solve this issue.
I still have to finish this weapon, perfect the outside a bit and paint. I have not had time to do this because I am working on the loading system that I present here. Later it will be.
I leave some images of the system and soon upload an operation video. :)
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Attachments
HA-SA 1.JPG
HA-SA I, (2).JPG
HA-SA I, (3).JPG
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Re: Small semi automatic hybrid project

Unread postAuthor: jackssmirkingrevenge » Sat Mar 09, 2019 1:28 pm

Looks great!

I still have to finish this weapon, perfect the outside a bit and paint. I have not had time to do this because I am working on the loading system that I present here


The fact that it works makes it already beautiful ;) looking forward to the video!
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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