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Concrete Lightbulb?

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Unread postAuthor: Brian the brain » Fri Jan 18, 2008 2:15 pm

Beating someone over the head with a phone is still the funniest thing ever!


What was the subject again...


Oh ... :idea:
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: zephir » Sat Jan 19, 2008 4:01 am

Back on topic, its harder than it sounds.

light bulb glass is very thin and breaks really easily. the best way to cut glass precisely is to etch a cut with a ultitly knife or something and carefully squeeze the socket end with a plier until the socket end's glass breaks and then you get the bulb. The larger the lamp, the harder it is. A night light bulb is the easiest to do.

And then, its not the ultimate projectile because the glass would break when it hits something or when you drop it, so you'll just end up with the lead or quick Crete you put in the bulb.

It may be ultimate round if you buy those chandelier bulbs, the 25 or 40w ones- those are pretty pointy.
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My interest on spud guns began when I couldn't legally buy guns.
Now its because my guns are too loud to legally shoot.

Its not like it was legal to being with, but they don't offer subsonic 7.62x39 or 7.62x54R. They only have subsonic .22 long. Thats no fun stuff doesn't explode.

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Unread postAuthor: psycix » Sun Jan 20, 2008 4:57 pm

An ultimate round would be created from some depleted uranium and other materials for an heavy core and super-hard jacket around.
But thats just for me and some other guys here....

For you, an "ultiament" round will suffice and I would recommend the potato to you!
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Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

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Unread postAuthor: Spitfire » Mon Feb 04, 2008 11:06 am

Use a blow torch to melt a hole, then fill
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Unread postAuthor: POLAND_SPUD » Mon Feb 04, 2008 12:14 pm

for me an ultimate round is cheap, heavy and, preferably, it should be a sphere or a flechette...

I don't want to be mean, it just isn't fun to spend 1/2 an hour do make one round...
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Unread postAuthor: DYI » Mon Feb 04, 2008 6:14 pm

I started this thing a few months ago, but can't shoot it 'til spring. It has a steel core, a concrete fillling, and weighs 6 pounds. It's not ultimate, but it's a far better idea than a concrete filled lightbulb, and it won't tumble (I hope :roll: )
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Attachments
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Needs a hollow tail and the back half of sabot, but you get the idea
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Unread postAuthor: Alabaster » Mon Feb 04, 2008 8:08 pm

One of the key things to having close to a flatline trajectory is having your projectile aerodynamic, and evenly balanced.
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Unread postAuthor: POLAND_SPUD » Tue Feb 05, 2008 1:39 am

Alabaster i wish it was as easy as what you said.... :D
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 05, 2008 1:47 am

POLAND_SPUD wrote:for me an ultimate round is cheap, heavy and, preferably, it should be a sphere or a flechette


Spheres are actually horrible rounds in aerodynamic terms, the reason we use them so much is that they are usually readily available and in the case of BBMGs and the like, they are cheap, reusable and feed reliably in relatively simple mechanisms.
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Unread postAuthor: Novacastrian » Tue Feb 05, 2008 1:53 am

jackssmirkingrevenge wrote:
POLAND_SPUD wrote:for me an ultimate round is cheap, heavy and, preferably, it should be a sphere or a flechette


Spheres are actually horrible rounds in aerodynamic terms, the reason we use them so much is that they are usually readily available and in the case of BBMGs and the like, they are cheap, reusable and feed reliably in relatively simple mechanisms.


Hey, don't diss marbles (spheres)! :D
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When you fill your car with refined oil remember that it has been paid for with blood and guts, some from your own countrymen, most not.

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Unread postAuthor: jackssmirkingrevenge » Tue Feb 05, 2008 2:04 am

Nothing wrong with marbles, but if you took the same weight of glass and shaped it like a dart, fired at the same velocity the results would be very different. It's all a matter of making the most of the power you have available, though more often than not this isn't cheap or easy, which is why most people are happy to stick with marbles :)
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Unread postAuthor: Novacastrian » Tue Feb 05, 2008 2:10 am

Sorry i was thinking about a statement you made a while back..

Hey, don't diss marbles. Apparently the Russians have a wood/ceramic two shot pistol that is designed to be smuggled through metal detectors, and guess what the use as ammo Wink

A 3/4" barrel should fit marbles pretty well - it's cheap, consistent ammo, nice and dense, quite hardwearing and spherical so ideal for auto feed systems.


Just a bad attempt at humour :lol:
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 05, 2008 2:28 am

haha I had forgotten about that, you got me there :? :D

I guess when you're looking to cause maximum damage at point blank range, aerodynamics get thrown out of the window. Another example from the Russians, their SP-4 silent cartridge for the PSS pistol made for close range use fires a mild steel cylinder with little in the way of aerodynamic refinement, though it is rifled.

Image

Image
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Unread postAuthor: Novacastrian » Tue Feb 05, 2008 2:49 am

Next line of development, almost unique to the Soviet armed forces, is the underwater firearms and ammunition for these.

Which leads to the question- why?

Thanks for the links, i had no idea that the piston rounds in question even existed.

I have learned something today, actually i have learned two things but the other one is totally not relating to any kind of firearm.
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Unread postAuthor: jackssmirkingrevenge » Tue Feb 05, 2008 3:31 am

Thanks for the links, I had no idea that the piston rounds in question even existed


The "closed circuit" cartridge idea has been around for a while, there's limited power available but it's a small price to pay for the noise benefits, instead of bothering with a large and bulky silencer, you completely eliminate the sound in a very compact package.

The Americans also developed a 12 gauge cartridge on the same principle for use in the tunnels of Vietnam, that used a metal diaphragm as opposed to a piston in the Russian designs, the AAI "Telecartridge"

Image

Here it is before firing:

Image

and after, with the projectile missing and the diaphragm blown out:

Image

Next line of development, almost unique to the Soviet armed forces, is the underwater firearms and ammunition for these.

Which leads to the question- why?


The Russians already have a rifle that can fire both underwater and in the air with equal effectiveness, the ASM-DT, and both Russian and Western forces have underwater pistols with multiple barrels.
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