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"In the world of spuds today"

A place to ask general spud cannon related questions.
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Re: "In the world of spuds today"

Unread postAuthor: jackssmirkingrevenge » Sat Jul 14, 2018 9:40 am

farcticox1 wrote:To me that's just bad practice :?


Without a doubt, that was the biggest failure here.
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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: "In the world of spuds today"

Unread postAuthor: farcticox1 » Sun Jul 29, 2018 12:56 pm

was looking at cheap QEV's on Ebay again, cause I'm cheap like that, then I thought I'd build one myself. Think I got it figured out.

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Re: "In the world of spuds today"

Unread postAuthor: farcticox1 » Tue Aug 07, 2018 6:28 pm

Got some parts together for a .177 smooth bore pellet gun (or BB), .18 ID stainless tubing, 1/2" 24vdc solenoid valve and 12" x 1" stainless chamber. Going to be a simple breech load with a sliding tube which has a seal at one end and will push against a O ring at the valve end to get a good seal on the tube. :idea:

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Re: "In the world of spuds today"

Unread postAuthor: hectmarr » Sat Aug 11, 2018 4:23 pm

This compatriot "crazy" perform some explosion tests with hydroxy, HHO. It's amazing how fast it burns. I found it very interesting, because you can see the whole process. There are 90 meters of hose, about 3,540 inches.
The test itself, begins at approximately 3: 15 minutes, and is filmed in normal and slow camera.
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Re: "In the world of spuds today"

Unread postAuthor: jackssmirkingrevenge » Sun Aug 12, 2018 6:24 am

Impressive! Also, is it normal in Argentina to have loud bangs coming from the garage? The neighbors don't seem to be worried at all!

If you look at the list of common fuels in the wiki, hydrogen actually has a bit more energy than most other gasses used for this purpose.
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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: "In the world of spuds today"

Unread postAuthor: hectmarr » Sun Aug 12, 2018 6:50 am

jackssmirkingrevenge wrote:Impressive! Also, is it normal in Argentina to have loud bangs coming from the garage? The neighbors don't seem to be worried at all!

If you look at the list of common fuels in the wiki, hydrogen actually has a bit more energy than most other gasses used for this purpose.

Apparently "this gentleman," the little angel "has no problems, I think he has tamed or domesticated his neighbors :)
I was seeing weapons that work with HHO and there are several. I have found some diagrams, but basically, I suppose it is a "normal" combustion weapon, with this type of fuel. What would be interesting to store in a gel or foam of some kind, lasting at least a few hours, HHO, as a solid fuel for combustion weapons. I mean to introduce the HHO as foam, in a cartridge and seal later. The H and O are trapped there.
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Re: "In the world of spuds today"

Unread postAuthor: jackssmirkingrevenge » Sun Aug 12, 2018 7:30 am

The use of combustion to power a piston is interesting and something I had touched upon in the past:

Image

Jimmy had done some experiments with closed chambers burning propane and he confirmed the limits of combustion pressures at below 150 psi which is not very useful for propelling small caliber projectiles to interesting velocities, but by using this pressure to propel a larger diameter piston, better performance is possible.

This one is basically how combustion nailguns work and the velocity of the projectile is limited to the velocity of the piston. Since you have to stop the latter, there is less practical performance potential unless you want to launch something heavy at relatively low velocities.
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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: "In the world of spuds today"

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Re: "In the world of spuds today"

Unread postAuthor: hectmarr » Sun Aug 12, 2018 7:57 am

Interesting study of Jimmy. I did not know him.
Basically the small ammunition is pushed by compressed air, and you use the pressure generated in the combustion as a "thermic spring". Interesting to try ...
It would also be possible to use a combustion with compressed mixture, a hybrid ... a matter of testing and developing.
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Re: "In the world of spuds today"

Unread postAuthor: jackssmirkingrevenge » Sun Aug 12, 2018 8:36 am

Interesting study of Jimmy. I did not know him.


He's a member of this forum who has done some very good empirical work in the field of spudguns.

It would also be possible to use a combustion with compressed mixture, a hybrid ... a matter of testing and developing.


We discussed this here, definitely going into light gas gun territory and probably an interesting avenue if you want to reach extreme velocities but I don't see many other practical uses.
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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: "In the world of spuds today"

Unread postAuthor: farcticox1 » Sun Aug 12, 2018 11:00 am

What's practical use got to do with anything done on here :shock: :D
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Re: "In the world of spuds today"

Unread postAuthor: hectmarr » Sun Aug 12, 2018 12:45 pm

farcticox1 wrote:What's practical use got to do with anything done on here :shock: :D

definitely ! :)
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Re: "In the world of spuds today"

Unread postAuthor: jackssmirkingrevenge » Sun Aug 12, 2018 6:52 pm

farcticox1 wrote:What's practical use got to do with anything done on here :shock: :D


Fair enough :D
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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: "In the world of spuds today"

Unread postAuthor: farcticox1 » Wed Aug 15, 2018 4:57 am

this looks sort of interesting for indoor use, you can build it into any design and I was thinking of adding sound effects for the shot of real weapons as selectable mp3 clips, full auto and select fire would be no problem :idea:

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