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Marble Assault rifle (WITH PICS)

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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Unread postAuthor: MrCrowley » Fri Sep 15, 2006 2:47 am

im taking my second year of german at school :P

have you tried spudwiki, the link is at the top of the page.
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Unread postAuthor: POS » Fri Sep 15, 2006 2:59 am

I am busy there. Nice tip man, thx. Hadn't seen it up there, just landed on this site yesterday.

Very intresting things.

What do you think of the rockets ?
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Unread postAuthor: MrCrowley » Fri Sep 15, 2006 3:41 am

the second rocket:i think three tail fins not four stabalize the rocket better, i cant remember,what will you make it out of?it would have to be fairly strong,so you can use them again and that rod doesnt break,strong but light.to get a good seal are you going to put a round end on the tail fins or make the rocket body fit the barrel?if you put a circular end on the fins so it seals against the walls in the barrel it will cause drag,i couldnt make out which chosie you chose in your daigram coz it was 2d and you havnt drawn the rocket to fit the barrel perfect.and for the parachute is it just tied to the end, or is it some how released during flight?because ive used aparchute rockets on my combustion and the parachute was just wrapped around the rocket and it slows it down quite a bit.
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Unread postAuthor: POS » Fri Sep 15, 2006 6:08 am

The basic idea on the second rocket is that is fits the barrel, not airtight, but almost airtight. Behind the rocket, the orange thing, is an airtight cilinder. I thougt of a wooden one, or something lighter, possibly with O-rings. This is only used to push the rocket out. Since you have to make it, it would be a shame to make one for every launch, zo i attached a chute on the back. The idea is that the chute and the cilinder get shot out of the barrel, pushing the rocket forward. Once in midair, the chute opens and stops the cilinder. The main idea is that it falls to the ground at max 10 meters from the barrel, so you dont have to go and look for it. The rocket is on it's way then.

The first drawing has a rocket with side fins. They don't fit airtight in a barrel, without damaging the fins, and even then. So the rocket is smaler than the barrel, so the fins can stand up like they used to. There for the cilinder used here needs a hole in it, so the back cone of the rocket (to make it airodynamic) fitsd in it, and the cilinder keeps the rocket centered in the barrel. The yellow things on the front of the rocket is hard foam or something light. It is shaped, zo is fits on the rocket, keeping the nose cone in the center of the barrel. Notice the chaped angle in front. It is shaped that way, so when the rocket leaves the barrel, the air gript between the foam and the nose cone, pushing the foam awai from the rocket, giving it a free flight. The foam is attached to the cilinder in the back by thin wooden sticks. They need to be fastened at the cilinder such way, that they can turn, i mean, like a door that opens. The coppeling between the cilinder and the sticks should be some kond of turning point.

When the rocket leaves the barrel at lets say 80 mph, the air pushes the foamparts away from the rocket, at that time the chute opens, and works as a break on the cilinder. The rocket keeps flying it's speed, and leaves the cilinder. The foam, stil having some forward speed, will stay open long enough to give the rocket time to leave and continue it's flight.

So, that's the main idea. In theory it should work well. When i have my first spud gun, i start working on the rockets.

The stabiliser of the second missile is made out of pvc as wel. The tailstick is made out of pvc al wel, out wood. Should indeed be strong enough to push the head of the rocket out of the barrel without breaking
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Unread postAuthor: killagorrila99 » Mon Sep 18, 2006 12:32 am

Hmm thats an interesting idea POS. And by the way what in the world does POS stand for??? HAHAHAHAHA I can think of a few sugestions.
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Unread postAuthor: POS » Mon Sep 18, 2006 12:46 am

You don't wanne know ...
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Unread postAuthor: killagorrila99 » Mon Sep 18, 2006 2:05 am

Hmmm is it the same thing that one of boogies guns is named?
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Unread postAuthor: POS » Mon Sep 18, 2006 2:19 am

hehe, no not at all.
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Unread postAuthor: killagorrila99 » Mon Sep 18, 2006 2:23 am

Peice of s*%t?
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Unread postAuthor: POS » Mon Sep 18, 2006 3:00 am

hehe, no. Would be stupid to name yourself like that :)

It means "Police Officier S..." The "S" stands for my name.
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Unread postAuthor: killagorrila99 » Thu Sep 21, 2006 2:19 am

sam??????????????????
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Unread postAuthor: rna_duelers » Mon Sep 25, 2006 6:06 am

Again,nice cannon so whats the next plan wih the super small valve?
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Unread postAuthor: killagorrila99 » Mon Sep 25, 2006 6:09 am

Um, A semi auto AK-47 replica.
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Unread postAuthor: Flinchy » Sat Sep 30, 2006 10:43 pm

nice gun man, geez you make it look easy to build a fully automatic gun. awesome.

-Flinchy :P
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Unread postAuthor: killagorrila99 » Sat Sep 30, 2006 10:54 pm

Thankyou flinchy, It was very easy to build.
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