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| Carlman |
 Posted: 12/18/2007 11:22 AM Post subject: Marble Mortar idea |
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The Aussie
Joined: 24 Nov 2007
Posts: 1110
292.21 Spud Bux
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Hey all,
Ive had an idea for a marble mortar. Here is a diagram of the setup:
Basically the fuel is butane injection and the ignition is a disposable camera. The camera is triggered by the marble pushing two electrodes together to form the spark which in turn ignites the butane.
To fire you pull the pin at the top of the barrel or you could just drop it in like a regular mortar.
As soon as i can get this camera ignition to work (having no luck so help would be good) i will attempt this if you cannot spot any problems.
The only dimensions i know id the OD diameter of the "barrel" which is 15mm. The rest can be worked out via the supposed 'perfect' C:B ratio, on which i also need help.
You will have to open the image to view properly
NOTE: also posted on combustion discussion as did not know where to put it. MODS feel free to move/delete as required. |
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| iknowmy3tables |
| Posted: 12/18/2007 11:32 AM Post subject: |
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Brigadier General
Joined: 15 Dec 2006
Posts: 1126
2659.19 Spud Bux
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okay it would work but why would you want a mortar, I'd just recomend tilting the spring stuff up at an angle, is this work some green army men battle renactment
it wouldn't be very strong without a bigger chammber |
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| Carlman |
| Posted: 12/18/2007 11:36 AM Post subject: |
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The Aussie
Joined: 24 Nov 2007
Posts: 1110
292.21 Spud Bux
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| yea i dont care much for strength i just want something that works like a mortar kinda and can shoot a marble a bit |
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| jackssmirkingrevenge |
| Posted: 12/18/2007 11:38 AM Post subject: |
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space monkey
Joined: 15 Mar 2007
Posts: 6517
9934.55 Spud Bux
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As the marble compresses the air on the air down, you could also have a hybrid effect of sorts  |
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| Carlman |
| Posted: 12/18/2007 11:39 AM Post subject: |
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The Aussie
Joined: 24 Nov 2007
Posts: 1110
292.21 Spud Bux
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so what kind of power could it produce, is it worth it?
EDIT: i mean i can get the pipe for free, endcap for a buck, camera for free allreday got butane lighter, all ready got marbles so yea. |
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| iknowmy3tables |
| Posted: 12/18/2007 15:44 PM Post subject: |
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Brigadier General
Joined: 15 Dec 2006
Posts: 1126
2659.19 Spud Bux
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not really not even enough to use a 1.5mix, thats a joke
I'd geuss but you'd get the power of a springloaded toy with less reliability make sure you have a safe and easy way of unloading marbles,
also I just remembered that the marbles are like a a perfect fit in 1/2"pvc really perfect but inside diameter of pvc varies from manufactures so it doesn't roll around much, if its too tight try AA batteries |
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| ShowNoMercy |
| Posted: 12/18/2007 16:02 PM Post subject: |
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Brigadier General
Joined: 19 Mar 2007
Posts: 1112
28.23 Spud Bux
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| Or you could make an air powered version, which would give you a more consistent and powerful gun. |
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| Carlman |
| Posted: 12/18/2007 21:26 PM Post subject: |
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The Aussie
Joined: 24 Nov 2007
Posts: 1110
292.21 Spud Bux
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yes im working on an air version aswell but that was my secret shhh!
ok i was going to have a triggered burst dist using 15mm pipe and 2 unions. A battery wiuld have a pin on its butt end which would pierce the 1st disk thus reducing pressure thus bursting second. |
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| ShowNoMercy |
| Posted: 12/18/2007 21:28 PM Post subject: |
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Brigadier General
Joined: 19 Mar 2007
Posts: 1112
28.23 Spud Bux
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Care to explain how a drop in pressure will burst the disk?  |
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| Carlman |
| Posted: 12/18/2007 22:30 PM Post subject: |
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The Aussie
Joined: 24 Nov 2007
Posts: 1110
292.21 Spud Bux
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it will use the trigered burst disk system. between two burst disks there will be a pressure of say 50psi and in the chamber there will be 100psi lets say the disk breaks at 75psi. The drop in air from between the disks pus more strain on the second disk causing it to break thus proppeling the ammo.
hope thts explained rite |
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| ShowNoMercy |
| Posted: 12/18/2007 22:32 PM Post subject: |
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Brigadier General
Joined: 19 Mar 2007
Posts: 1112
28.23 Spud Bux
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| Yea you forgot that one piece about differing pressures but yea makes more sense now. |
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| Carlman |
| Posted: 12/18/2007 22:35 PM Post subject: |
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The Aussie
Joined: 24 Nov 2007
Posts: 1110
292.21 Spud Bux
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| yea i really didnt wanna go into it b4 i had just woke up lol |
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| cooptroop123 |
| Posted: 03/21/2008 11:55 AM Post subject: |
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Private
Joined: 01 Mar 2008
Posts: 5
14.31 Spud Bux
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| that will be a pain to fill one chamber to 100 psi and another to 50 |
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| STHORNE |
| Posted: 03/21/2008 12:02 PM Post subject: |
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Master of Spuds
Joined: 14 Feb 2007
Posts: 1170
500.99 Spud Bux
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| sounds plausible and effective, nice work on the diagram. |
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| Carlman |
| Posted: 03/22/2008 7:29 AM Post subject: |
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The Aussie
Joined: 24 Nov 2007
Posts: 1110
292.21 Spud Bux
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| cooptroop123 wrote: | | that will be a pain to fill one chamber to 100 psi and another to 50 |
firstly old thread
secondly read here |
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