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mortar

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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mortar

Unread postAuthor: koolaidman » Sun Jan 13, 2008 7:25 pm

hey, i had this mortar prototype working, but i just finished the stand today. It's got a 6"x6" (drum bell?) for a mount. Its held up by a bipod with a 3/8" thread to raise/lower height. You do this by twisting the 1/2" 4-cross either way. It works very simply. Its like a burst disk except i stop pumping and drop the round down the muzzle. The nail hits the foil in the union and it bursts. dangit. I put the pics in backwards :x
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Attachments
000_0021.jpg
whole mortar.
000_0022.jpg
Pic of the angle adjuster.
000_0023.jpg
angle measure
000_0024.jpg
75 deg.
000_0025.jpg
60 deg.
000_0026.jpg
mortar rounds, note the protruding nail.
000_0027.jpg
heres another gun i made that was lying around.
Last edited by koolaidman on Fri Jun 27, 2008 2:23 pm, edited 1 time in total.
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Unread postAuthor: jon_89 » Sun Jan 13, 2008 7:30 pm

I like your rounds. How well does it shoot? I really like your other gun. Specs for both maybe. :lol:
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Unread postAuthor: Maniac » Sun Jan 13, 2008 7:32 pm

looks nice what kind of height do you think this is getting. i also love the nail in the bottom of you ammo that pops the disc.
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Unread postAuthor: hi » Sun Jan 13, 2008 7:42 pm

thats pretty cool. ive always wanted to make one, just never really got around to it... :(
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: frogy » Sun Jan 13, 2008 7:43 pm

This definitely works, even if the mortar round doesn't seal good...

I have done this before with PVC rockets in which I hot glued a nail to the sidewall... It's pretty damn fun when you have multiple mortars, air compressors, and "helpers" (burst disk replacing friends :P) :)

The only bad thing is when the PVC rocket hits your loading mechanism because you didn't move it out of the way fast enough and blows it to smithereens...

You didn't think you were going to drop these in with your hand did you?

It's not as bad if they're launched at an angle and slide down slow... But PVC projectiles could definitely rip your appendages off...


I like your other pneumatic also... It reminds me of my PB Pneumatic... I made a stock out of a 45 and (2) 90s though...

Image

Very terrible primer job compared to most of my work if I do say so myself :) I think it was because I was mad, due to my local Home Depot not selling 1" NSF-PW Wye fittings... and I didn't want to use a 1" tee + a 1" 45
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Last edited by frogy on Sun Jan 13, 2008 7:44 pm, edited 1 time in total.
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Unread postAuthor: koolaidman » Sun Jan 13, 2008 7:43 pm

dont really know for sure. ive been meaning to actually get it out to an open area. I did some preliminary testing it in my backyard. 35 psi was enough to hit my neighbor's roof. Too lazy for specs, sorry amigo. If you want a specific measurement i'd be glad to tell ya.
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Unread postAuthor: jon_89 » Sun Jan 13, 2008 7:53 pm

Well will you please tell me. I am very interested in the other gun.
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Unread postAuthor: potatoflinger » Sun Jan 13, 2008 8:04 pm

Very nice mortar, I'll bet it's pretty loud :D I also like the other pneumatic, but one of the fittings on it is dwv (not pressure rated), so I would suggest replacing it, or keeping the gun below 50 psi. The dwv fitting is the rounded off 90 degree elbow.
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Unread postAuthor: koolaidman » Sun Jan 13, 2008 8:22 pm

:cussing: I didnt recognize the dwv! that pisses me off. I could usually only take it to 40, but i just epoxied a leak in the sprinkler so i was gonna us it at 100... thanks tho, that just about saved my life. Well, i am gonna hand load them. Its not an issue because, like a real mortar, the round's diameter is a little smaller than the tubes, so because of berlin forces, it takes a little bit to hit the bottom of the tube (still enough to puncture tho.)

I dont really know what you want in terms of specs for the rifle. Its all 1.5" except the sprinkler. Its piloted with a 1/4" ball valve (much better flow and realisticness imo) on a 90. The pipe coming off of that is just 1/2" pvc i jammed it there to hold it better.
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Unread postAuthor: hi » Sun Jan 13, 2008 8:46 pm

what kind of range can you get with it and at what pressure?
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: psycix » Mon Jan 14, 2008 6:27 am

Looks good, and your ammo is really awesome.
I would like to have some details on that. They look really cool.
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Unread postAuthor: hi » Sat Jan 19, 2008 10:12 pm

this cannon has inspired me to make my own. i finished it last night and tested it today. it passes with flying colors. i was lucky and found a near perfect round that already has a puncture pin on it. i shot it at around 100 psi. i dropped it in, heard a loud bang and never saw the projectile again. sadly, i didnt recover the projectile. with no more "mortar" rounds on hand, i just used it as a burst disk cannon.

what exactly do you make your rounds out of? is it 3/4'' pvc fittings with tape on it?

thanks for the inspiration... will post when painted.
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"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
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Unread postAuthor: STHORNE » Sat Jan 19, 2008 11:03 pm

wow, i really love the ammo with the nail. could you post some damage pics? interested in the damage this thing can do.
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Unread postAuthor: Mr.Sandman » Wed Jun 25, 2008 9:00 pm

thats pretty darn good i like your style of launchers 8)
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Unread postAuthor: frogy » Wed Jun 25, 2008 10:05 pm

Note that this hasn't been posted in since January, and your comment didn't really add content, it was just a comment, though I'm sure he'd be happy to see a response, rogue thread reviving is normally looked down on.

Of course my post isn't doing much, but whining either :P
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