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Small autonomous hybrid

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 autonomous hybrid

Unread postAuthor: jackssmirkingrevenge » Wed Aug 16, 2017 8:46 am

Not just an idea, I can confirm that it works ;) basically it seals like a piston valve.
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Re: Small autonomous hybrid

Unread postAuthor: hectmarr » Wed Aug 16, 2017 10:09 am

jackssmirkingrevenge wrote:Not just an idea, I can confirm that it works ;) basically it seals like a piston valve.

No doubt that it is! The idea seems very good to me.
Changing the conversation topic, I tried a valve to replace the cartridges with rupture disk.
This valve is basically a regulated relief valve to open two or three times at a higher pressure than the one of the hybrid. It works fine, but what I have noticed from the experiments is that it does not let out all the mixture from the combustion chamber when the explosion occurs, there is always some mixture trapped in the chamber. It closes very quickly.
I put on a hard spring. Just at 8 Bar begins to open this valve, (compression is 4X), but it works !. I believe that with a combustion chamber with 30% more capacity, there would be no problems, because the volume expelled in the required firing, (according to my results with about 200 cm3 is enough), would be compensated. I would have to adapt the design of this valve so that it does not interfere with the piston that sweeps the burned gases, which cleans the combustion chamber. And would only have to load the .22 ammunition only.
I leave some pictures of the experiment, although I did not make video because I'm alone.
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Re: Small autonomous hybrid

Unread postAuthor: hectmarr » Wed Aug 16, 2017 10:39 am

Some images of the experiment.
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Re: Small autonomous hybrid

Unread postAuthor: jackssmirkingrevenge » Wed Aug 16, 2017 10:53 am

Are you going for a semi-automatic version of this? I can see complete expulsion of the exhaust gasses being a problem with a valve that re-closes automatically.
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Re: Small autonomous hybrid

Unread postAuthor: hectmarr » Wed Aug 16, 2017 1:09 pm

jackssmirkingrevenge wrote:Are you going for a semi-automatic version of this? I can see complete expulsion of the exhaust gasses being a problem with a valve that re-closes automatically.

This is good the system that you show me. What I am analyzing and experiencing is not semiautomatic. What I want is to replace the cartridges with rupture disc by the valve that is in the photos.
In fact, it does not expel all the gas content of the combustion chamber, but equally, it works in a powerful way, and comparable to the prototype with cartridges and rupture discs that I am using for the same compression pressure of 4X. Then I'll put a sketch here, so you can see how I'm building it myself.
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Re: Small autonomous hybrid

Unread postAuthor: hectmarr » Wed Aug 16, 2017 2:17 pm

This is exactly what I experienced. What I need to do is reconfigure the valve so that the adjusting nut is facing away from the combustion chamber so that the force of the spring can be varied comfortably.
Being more specific in what I experienced. The combustion chamber has a volume of 90 cm3 in total. At 4X the amount of air is 360cm3. After the shot, when connecting the manometer it is seen that this mark 1,5bar, or that 180cm3 remained in the camera and did not leave by the barrel, when firing.
My idea is to make the combustion chamber a little bigger, about 150 cm3, and I think this problem would be compensated for.
The good thing about this, in my opinion, is the very simple thing to build. We will see this question further along the way.
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