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Sabot

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: insanebuddy720 » Wed Feb 03, 2010 6:30 pm

Hello, Im new here to spudfiles and have just recently made my first spud gun shown below. It has a 2 inch barrel.

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I have an idea for a sabot round for this. Im thinking about using a 12 inch spike as my round. For those who dont know a 12 inch spike is essentially a foot long nail. I have run into a few problems as far as the sabot itself though. I dont know what material to use as the sabot. I was thinking about using foam and cutting it into a 2 inch by 1 foot round slug and cutting it in half down the middle and placing the spike in the middle. Does anyone else have a suggestion or another idea?

Thanks in advance.
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Unread postAuthor: McCoytheGreater » Wed Feb 03, 2010 6:47 pm

Try GreatStuff. You can get it at a hardware store. It's that expanding foam sealer/insulator stuff. It's a little finicky, but if you have your mold and round greased fairly well it should work with no problem. I always get too excited about my sabot round, but if you let it sit for a while (6hrs) it should work quite well.
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Unread postAuthor: insanebuddy720 » Wed Feb 03, 2010 6:54 pm

i was also thinking about great stuff but dont know if it could handle the shock or not.
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Unread postAuthor: insanebuddy720 » Wed Feb 03, 2010 6:59 pm

after some searching in the forums (should have done that first) i found that someone also had this idea cept they were smart and added stabilizing fins to it
http://www.spudfiles.com/forums/casting ... 18012.html

looks like they used foam as well.
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Unread postAuthor: McCoytheGreater » Wed Feb 03, 2010 7:37 pm

insanebuddy720 wrote:i was also thinking about great stuff but dont know if it could handle the shock or not.


It's not too terrible. We used the one sabot-esque thing we made in our pneumatic cannon. It doesn't crack or blow by and fires our demo-round pretty quickly and that's at 100p.s.i. It should do just fine for your combustion gun.

P.S.--Before the mods get you, try not to double post unless you absolutely have to. If you were the last to post and have something new, click the edit button.
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Unread postAuthor: insanebuddy720 » Wed Feb 03, 2010 8:08 pm

woops my bad :oops:
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Unread postAuthor: rcman50166 » Wed Feb 03, 2010 8:20 pm

Beat you to it. Behold!
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Unread postAuthor: insanebuddy720 » Wed Feb 03, 2010 8:25 pm

where did u get the foam and like what are those stabilizing fins made out of and howd u attach them. just use glue or what? and how well do these shoot? sorry about all the questions lol
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Unread postAuthor: rcman50166 » Wed Feb 03, 2010 9:00 pm

It's fine. That's what communities like this are for. Anyways I used 2" insulation foam board, u know, the ones that insulate foundations of buildings? I cut them out in circles the size of the bore and then cut them in half. One piece of foam behind the dart, 4 over it. I used hot glue for everything, including the fins. The fins are made of project board. I glued as many as I could put on (which turned out to be around 7). They shoot like a dream, I've been meaning to make more and try different aerodynamic profiles to separate the sabot better but maybe you can pick up where I left off. :wink: They fit very well too. I had to take off the cleanout caps on my cannon to equalize the pressure so the sabot would slide in the barrel. I managed to penetrate 1/4 normalized steel plate. Although I don't have proof . :roll:
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Unread postAuthor: Jeeperforlife » Wed Feb 03, 2010 9:07 pm

For my darts I use foam rod. You buy it at hardware stores for insulating pipes. I take the small size and put it in the larger size for my 2" barrel. I don't have a picture of the foam rod. Here is a picture of the dart.

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Marcus
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Unread postAuthor: insanebuddy720 » Wed Feb 03, 2010 9:17 pm

thank you for answering my questions but i got more lol


would they fly straight without the stabilizing fins? also how thick did you make the fallow up sabot behind the spike.
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Unread postAuthor: rcman50166 » Wed Feb 03, 2010 9:24 pm

They would not fly straight for long unless you have some sore of drag inducing item on the back half of the dart. The one I made only had a 2" piston.
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Unread postAuthor: insanebuddy720 » Wed Feb 03, 2010 9:30 pm

again thank you all for answering my questions
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Unread postAuthor: rcman50166 » Wed Feb 03, 2010 9:45 pm

No Problem. Welcome to Spudfiles. :)
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Unread postAuthor: insanebuddy720 » Wed Feb 03, 2010 9:54 pm

thanks mate ill post later how it turns out
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