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Machined pengun - Dimply

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Unread postAuthor: saefroch » Fri Jul 29, 2011 3:58 pm

I predict tumbling.

PROVE ME WRONG!
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 30, 2011 1:48 am

Haha brilliant!

Can I suggest a low pressure shot at 1000 frames per second from the side (a bit likethis) or down-the-barrel, fired at a soft target, before any "destructive" shots?
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Unread postAuthor: LeMaudit » Sat Jul 30, 2011 1:12 pm

saefroch wrote:I predict tumbling.
PROVE ME WRONG!


I can't :?

Epic tumbling!!... I'm working on the video :D
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 30, 2011 1:14 pm

I predict a two part steel/aluminium version soon :D
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Unread postAuthor: saefroch » Sat Jul 30, 2011 1:26 pm

Ive worked with projectiles supposedly stabilized by sectionional density, but they never seem to. I suggest fins of some sort, with a steel head and UHMWPE body.
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 30, 2011 1:34 pm

saefroch wrote:Ive worked with projectiles supposedly stabilized by sectionional density, but they never seem to.


You mean centre of gravity?
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Unread postAuthor: LeMaudit » Sat Jul 30, 2011 4:41 pm

[YouTube]http://www.youtube.com/watch?v=y0FSkbyw9xM[/YouTube]
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Unread postAuthor: Gun Freak » Sat Jul 30, 2011 4:47 pm

Quite entertaining :D
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Unread postAuthor: saefroch » Sat Jul 30, 2011 5:07 pm

jackssmirkingrevenge wrote:
saefroch wrote:Ive worked with projectiles supposedly stabilized by sectionional density, but they never seem to.


You mean centre of gravity?
Ummm sure... Care to explain the difference? May be of some assistance to LeMaudit... maybe...

The video was quite well done. I suggest extending the tail farther away from the head, also pushing the CD on the head down farther and that of the tail up farther will probably help. The head looks more like a G6, if you can, I'd go for more of a G7 shape (tangent ogive).
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 30, 2011 5:22 pm

saefroch wrote:Care to explain the difference? May be of some assistance to LeMaudit... maybe...


I already did ;)

Nice video LeMaudit, shame you seem to live in the flightpath of a major airport :P :D

I'm sure that you already see the value of high speed footage when it comes to testing - and that you took my lighting suggestions seriously, surprised that clay didn't solidify instantly!

One thing about shooting through water, here's a bit of wisdom from the box'o'truth:

bullets penetrate approximately 1.6 to 2 times as much in water as in soft tissue


It's a very vague analogy, but halving water penetration will give you a good approximation of penetration in flesh...
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Unread postAuthor: LeMaudit » Sat Jul 30, 2011 5:45 pm

Thanks, I had fun doing it. :D

Since I discovered video making for this serie of pengun videos, I'm enjoying it a lot. But I will now work of a bigger better more powarrrful project to continue my testing. No more pengun... this conclude the season.

You will sure have to suffer for some more silly videos in the future :wink:

and that you took my lighting suggestions seriously


I always do :D

I'm considering buying some more clay to shoot at.
Would sculpting clay do well? It's easy to find in art and craft stores.
For shooting, say, a .50 ammo at 50 ft*lb, any idea how much thick it should be to stay in the clay (or slow down considerably to avoid any rebound)? Maybe there's a rule of thumb to apply?
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Unread postAuthor: daniel0663 » Sat Jul 30, 2011 6:16 pm

The video....... it was quite, Awesome 8)

You will sure have to suffer for some more silly videos in the future


Very much looking forward to it. :P
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Last edited by daniel0663 on Sat Jul 30, 2011 9:43 pm, edited 1 time in total.

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Unread postAuthor: jor2daje » Sat Jul 30, 2011 7:22 pm

Shooting clay is great fun, particularly with high velocity launchers. I can buy it by the 25 lb bag for $5 where I live and you can easily slam it back into a rough block after some shooting, so you get a good day or two of shooting out of a single block. More if you cover it with plastic inbetween days/shootings. Shooting 4" thick slabs is lots of fun with my .50'' launcher, projectiles go all the way through but you get to to see some awesome shockwaves and such that blow out the back of the clay, looks pretty awesome on highspeed too.
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Unread postAuthor: jackssmirkingrevenge » Sat Jul 30, 2011 11:06 pm

LeMaudit wrote:I'm considering buying some more clay to shoot at.
Would sculpting clay do well? It's easy to find in art and craft stores.
For shooting, say, a .50 ammo at 50 ft*lb, any idea how much thick it should be to stay in the clay (or slow down considerably to avoid any rebound)? Maybe there's a rule of thumb to apply?


You know, if your wife can spare the room in the fridge...

You might also want to consider Plumber's Putty, or the other favourite, soap - though the latter will need more than one bar for larger calibres.

If you just want a backstop, I find that a box full of old newspapers is quite sufficient. Even a 30-06 AP bullet won't make it through 20 inches of paper.

Image

saefroch wrote:like a G6


:D
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Unread postAuthor: LeMaudit » Sun Jul 31, 2011 10:51 am

if your wife can spare the room in the fridge...


I have my own fridge in the basement... cause my wife don't want my stuff in hers :D
Mainly for beer right now, but why not gelatin? I'll check that!

And now I know what to do with all those old KBCTools and Sears catalogs :lol:

Thanks for the ideas!
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