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authentic mortar

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Unread postAuthor: battlelava » Wed Feb 29, 2012 8:12 pm

I've been looking at a replica mortar system but I have no idea were to start with a drop fire system. Any ideas
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Unread postAuthor: Crna Legija » Thu Mar 01, 2012 1:39 am

Hammer valve but with a catch to hold it open could work or burst disc that is punctured by the back of the round.
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 01, 2012 1:43 am

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Unread postAuthor: battlelava » Thu Mar 01, 2012 7:52 am

No ways for a combustion to do it?
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 01, 2012 8:08 am

battlelava wrote:No ways for a combustion to do it?


Yes

Image
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Unread postAuthor: Technician1002 » Thu Mar 01, 2012 9:37 am

A snap trap trigger in it with a strike anywhere kitchen match would ignite a combustion. A cap gun cap may also work as an ignition source, though I have not tried it. A charged photo flash capacitor that is shorted by the round is another inexpensive ignition possibility. Take one from a disposable camera. It includes a free charging circuit.
A 9 volt battery in the bottom and a little steel wool on the round is another way to generate ignition.

Use your imagination. Create a spark when the round makes contact with the bottom. Do you need spoon fed another half dozen ideas?
:roll:
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Last edited by Technician1002 on Thu Mar 01, 2012 9:43 am, edited 1 time in total.
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Unread postAuthor: jackssmirkingrevenge » Thu Mar 01, 2012 9:42 am

... or a combustion mix in the tail of the projectile, with built in electrodes that touch contacts at the base of the mortat tube connected to the ignition sistem.
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Unread postAuthor: battlelava » Thu Mar 01, 2012 12:21 pm

I'm going to try to whip up some shells and try it out. Hopefully I got some material to make the shells.


still trying to figure out what size the shell should be, so it can hold its fuel and at the same time still fly a good distance. :scratch:
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Unread postAuthor: jakethebeast » Thu Mar 01, 2012 3:16 pm

I would say 2" PVC would be quite good
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Unread postAuthor: battlelava » Thu Mar 01, 2012 3:24 pm

That's Wat I plan on using. Just have to find something to use for. Shells
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Unread postAuthor: Engineererrrr » Thu Mar 01, 2012 4:57 pm

nice ideas.

Does a gauss gun count as a spud gun?
if so thats a possible idea.
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Unread postAuthor: killerbanjo » Thu Mar 01, 2012 6:19 pm

The enery needed to launch a morter size projectile would have to be like 2000 joules or somthing - Like a 450v 30000uf capasitor or proberbly more :V Thats enough to kill you 100s of times over. One wong move and you would be a chared dead human :lol:

Not to mention how manny big ass batterys you would go through
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Unread postAuthor: battlelava » Thu Mar 01, 2012 7:39 pm

so I've come up with this

Image[/URL]


I'll put some weight in the top of the shell to give it the power needed to drop and then to fly some distance.
The shell would be made from the top of a water bottle attached to a slightly smaller pvc body maybe, and then some sort of cone. Not sure how I will do it because I have such limited resources right now.
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Unread postAuthor: Hubb » Thu Mar 08, 2012 2:15 am

Your design may work, but there are obvious problems, the main one being the alignment of the terminals.

A while back, I proposed a theory on the same concept. Here is a picture:
Image

This trigger design worked by dropping the projectile into the barrel. The weight of the projectile pushed the inner wire back. Once the inner wire made contact, the circuit was complete and the valve fired. And it worked out great. The launcher itself didn't produce the range I sought after, so I dismissed the idea (it was to be used as a mortar for paintball, operating an electronically fired sprinkler valve).

Since the trigger design did work for mine, however, it should work for a combustion fired launcher, and probably to better effect. If you could come up with a way of auto-filling and venting the chamber, then you will have the combustion fired mortar you seek.

Good luck.
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Unread postAuthor: Zeus » Thu Mar 08, 2012 3:07 am

Why not just use a burst disc and a pointy-stabby thing on the base of the projectile? It's been done before.
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