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1" barrel insert for DD1....

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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1" barrel insert for DD1....

Unread postAuthor: jeepkahn » Tue Jul 07, 2009 3:22 pm

While I was off this past week I got a wild hair and thought to myself, "Self, how hard would it be to make a 1" insert for DD1???" and I was like, Not hard.... I'll take pics tonite and post tommorow, but what I did was take a 15ft section of 1" sch40 and ducttaped around it until it was a snug fit into the GB barrel and did so at the bottom and every 3ft to where the 1" met the end of the GB barrel, then I removed the breech and piston from dd1 so that I could measure/mark/install a 1"slip to 2"mpt adapter and get it spaced so that the breech end wouldn't interfere with the piston sealing on the GB barrel... Then I installed a 2"slip tp 2"fpt adapter to the actual gb barrel, and when I want to use DD1 forsmaller projectiles I insert the 1" barrel and screw it onto the GB barrel, so now DD1 has a 10' GB barrel and a 15' 1" barrel ..... I'll get some chrony readings tonite between DD1 and a 15ft 1" barrel and 150psi and the decimator with a 1" 5ft barrel and 600psi...I'm guessing they'll be pretty close....
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Unread postAuthor: THUNDERLORD » Tue Jul 07, 2009 4:47 pm

When I type "DD1" in search, I get a bunch of gibberish back....Got a link???

Any way, you sleeved a 1.5" barrel with a 1" barrel (both PVC) so???

Why not just use a reducer bushing???
Maybe I've missed something(?)
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-----SPEED,STRENGTH, AND ACCURACY.-----
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Unread postAuthor: jeepkahn » Tue Jul 07, 2009 5:20 pm

http://www.spudfiles.com/forums/dd1wood ... 17514.html

And whatI did was make it so that in less than 30 seconds you can go from shooting gbs to shooting 1" superballs and back, when I post the pics tomorow you'll get the point... The Barrel on DD1 is 10ft, the 1" barrel is 15ft, have you ever seen how flexxy a 15ft piece of 1"sch40 is??? With this setup I can add the 1" into the existing GB barrel without changing anything else...And have a straight 15ft 1" barrell....
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Unread postAuthor: THUNDERLORD » Tue Jul 07, 2009 5:57 pm

OK. Thanks for the link.
( I didn't mean any offense, it was confusing).
Looks like a vid would be very interesting. 8)

I'm wondering what the highest velocity of a 1" "superball" has been(???)

BTW, 15 feet of 1" has only a volume of about 2.25 liters.
But that could be a good aspect.
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Unread postAuthor: jeepkahn » Wed Jul 08, 2009 8:50 am

Here's the promised pics.... I didn't get home in time to do any chrony testing last nite and i took the pics this morning....
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Attachments
dd1sleeved.jpg
dd1sleeveconnector.jpg
dd1scapart.jpg
dd1sleevebush.jpg

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Unread postAuthor: Technician1002 » Wed Jul 08, 2009 9:26 am

Great minds think alike. I'll grab a photo of my BG insert for my 2 inch cannon. It mounts a little differently and uses a venturi for higher COF.

Edit.. Got photos taken. Golf Ball Barrel that slides inside a 2 inch barrel. Dual use.. Ramrod for the 2 inch or a golf ball barrel.
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Attachments
Crowned GB.jpg
Golf ball barrel going into 2 inch barrel
Crowned GB1.jpg
Golf ball barrel ready to screw onto the 2 inch cannon valve.
Last edited by Technician1002 on Wed Jul 08, 2009 12:21 pm, edited 1 time in total.
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Unread postAuthor: jeepkahn » Wed Jul 08, 2009 9:33 am

If I had thought of this sooner, I would've made the decimator with a 1.25" barrel and had the ability to reduce to 1" longer barrel....
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