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Compact Grenade Launcher

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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Compact Grenade Launcher

Unread postAuthor: Davidvaini » Wed Mar 12, 2008 1:13 am

Its not completely done (Needs paint and rail system and better trigger.)
But I thought I would show you guys my first prototype for a Compact Burst Disk grenade launcher...

Image
Image

My ghetto Trigger setup(will be fixed up later)
Image



Assembly
[youtube]http://www.youtube.com/watch?v=GO10AqzE7DE[/youtube]

Interchangeable barrels
[youtube]http://www.youtube.com/watch?v=-Xp7oRFP6OE[/youtube]

I will hopefully get a video of it firing here soon because it has some decent power for its size and it's quite loud.
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Unread postAuthor: Carlman » Wed Mar 12, 2008 1:17 am

what psi have you tested it at?

i would imagine that the coupling would fire off with the barrel with enough pressure
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Unread postAuthor: Davidvaini » Wed Mar 12, 2008 1:49 am

70PSI and then the disks bursted, highest trigger pulled fire was at 65psi.

The coupling and barrel are very secure and very snug so thats not a concern.
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Unread postAuthor: Cosmic Muffin » Wed Mar 12, 2008 6:33 am

kool nice idea 8) but what do you use for the burst disk and how do u get it in there? does it leak without a proper union joint? :?:
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Unread postAuthor: judgment_arms » Wed Mar 12, 2008 8:40 am

Cosmic Muffin wrote:...but what do you use for the burst disk...


Judging by the first video he used aluminum foil.


Looks okay, how far will it put a NERF?
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Unread postAuthor: bigbob12345 » Wed Mar 12, 2008 9:27 am

Thats quite clever, but does it leak a little I would think it might.
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Unread postAuthor: Carlman » Wed Mar 12, 2008 10:53 am

bigbob12345 wrote:...but does it leak a little I would think it might.


wow that took a while to get my head around :shock:



:D
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Unread postAuthor: DYI » Wed Mar 12, 2008 11:02 am

I assume you've never read my and Rag's discussions about time travel...
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Unread postAuthor: goathunter » Wed Mar 12, 2008 12:35 pm

Hey Davidvaini,

Cool idea but I can already tell you its going to be inaccurate as all get out.Not to fear this isn't a "crappy design" post. What you need is to wrap the football in paper. Get a sheet of computer paper and cut it into 2" wide strips 8" long(about 5 strips total). crumple the strip into a ball and then pull it back out straight(this will prevent the paper staying attached to the football in flight). Next wrap the football and twist it down into the barrel. You're set.

1.5" barrels and especially short ones have a very hard time dealing with the friction of the football against the barrel wall. Th paper is a better method of lubrication than oils or what not(no dirty jokes Jack!).

On second thought, why not use a 2" acrylic barrel. I've got some acrylic pipe that fits a nerf perfectly. 2" short barrels always have the advantage over 1.5" short barrels.
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Unread postAuthor: Hubb » Wed Mar 12, 2008 4:54 pm

I would love to see this thing in action, especially once you get the rail system and it mounted. I really like the triggering system, although, you may have concerns of loosing your trigger (until you get it fixed, that is).

And, I would agree with goathunter, the 2" pipe wold work better.

Nice job, so far.
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Last edited by Hubb on Wed Mar 12, 2008 7:17 pm, edited 1 time in total.
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Unread postAuthor: JDP12 » Wed Mar 12, 2008 4:58 pm

that's really cool, now i just have to get mine working... ah well we shall see
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Unread postAuthor: OuchProgramme » Wed Mar 12, 2008 6:01 pm

A rail system for a grenade launcher?

Unrealistic...but what works=/.

How far can you blast the mock grenade?-And, is it at a certain angle?-
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Unread postAuthor: Hubb » Wed Mar 12, 2008 6:55 pm

OuchProgramme wrote:A rail system for a grenade launcher?

Unrealistic...but what works=/.

How far can you blast the mock grenade?-And, is it at a certain angle?-


I thought about building one for my paintball launcher and here is what I've come up with:

First, I would mount a 1913 rail to the bottom of my shroud (I'm packing an A-5 Flatline). If the barrel does not have a shroud, one could be constructed out of PVC pipe. Next, I would build the launcher (duh) then acquire some scope rings and remove the top portion of them, and screw them to the launcher from underneath. The rings should mount on to the rail.

That's what I would do.
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Unread postAuthor: OuchProgramme » Wed Mar 12, 2008 7:07 pm

Hubb, i understand how to mount the scope.

But on a grenade launcher?
I guess..on certain standards, realism should be a factor
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Unread postAuthor: the cats in the bag » Wed Mar 12, 2008 7:19 pm

ouch is right your using foil burst disk and and your shooting a nerf grenade out of a 8in barrel, a scope is just unpractical for a grenade launcher of this status, but its still pretty sweet. :D
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