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Some tips if possible please

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Some tips if possible please

Unread postAuthor: Houseton » Fri Oct 04, 2013 5:34 pm

Hello I am new to the forum, been looking around for a long time to accurately build my first spud gun (golf ball launcher).

Just had a few questions for anyone who has built one or could just guide me in the right direction.

So when you sleeve the SDR-21 into the 2" sch 80 pipe do you need to solvent them together?

I've calculated the size of chamber (1.5:1) as 14" of 4" sch 80[rounded from 13.5"]

Now when connecting the barrel to the chamber I'll need a fitting that goes from 4" to 2", but the SDR-21 will just be sitting there no? It seems like I would need to glue them together or else risk having the pipe launch out?

I was also looking at the cam lever way of joining the barrel to the chamber but it's hard to find those fittings where I am.


Any input would be greatly appreciated.

Other info:
I'll be using ether (car starter) as the fuel. and would be wrapping my gun in fiber tape. I'm going to be using a electric BBQ starter as the sparker.


Thanks
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Unread postAuthor: dart guy » Fri Oct 04, 2013 6:14 pm

make a drawing of your idea and how you think it will work and the improvments will come in quickly.
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when life gives you lemons... make root beer and leave the world wondering how you did that :D
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Unread postAuthor: Houseton » Fri Oct 04, 2013 6:45 pm

Hey thanks for the info. I'm going to do so before the build but I'm referring to this:
http://www.spudfiles.com/forums/golf-ba ... t5915.html

Number 2:
So you glue the SDR-21 in the 2'' pipe is my biggest and most needed to know question.
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Unread postAuthor: dart guy » Fri Oct 04, 2013 7:11 pm

i mean make a pic on paint to show how you want to assemble your cannon
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when life gives you lemons... make root beer and leave the world wondering how you did that :D
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Unread postAuthor: Technician1002 » Sat Oct 05, 2013 12:40 am

It does need to be prevented from blowing out. It does not need to be glued. On a pneumatic I made, with a 2 inch screw on barrel (ABS) a golfball barrel simply slid inside as an insert with a flange on the end so it could not fall on through.

I'll see if I can find a pic and post it later. Edit, Didn't find a pic posted on SF of this golf ball barrel insert. May have to take a new photo and post it after the forum is back up.
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