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2.5" piston?

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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2.5" piston?

Unread postAuthor: LCTChamp » Mon Apr 13, 2009 8:20 pm

Well I recently won a lot of spudding supplies off ebay from Foxxlord (some of you may know him). In the lot there was a 2.5" tee. So I was thinking what fits in 2.5" pipe that would work as a piston? I searched the forum for 2.5" pistons but couldn't find anything. I either can't use the search feature or there aren't many made. Well I knew tennis balls would fit, but I didn't know how they could be turned into a piston. This is what I came up with.

First I would cut the ends off of the tennis ball then fill it with either epoxy or hot glue. Then I would add a washer and sealing face. I then realized the ball could just turn and the sealing face wouldn't be aligned. So I thought that I could attach a short length of 2" pipe to the back to keep it aligned.

So do you think this will work? What else could I use as a piston instead?
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Unread postAuthor: jmeyer1022 » Mon Apr 13, 2009 8:38 pm

I believe the tennis ball is a bit of a squeeze into 2 1/2 pipe. I'd recommend getting a 2 1/2" hole saw and cutting wood disks or w.e material you'd like to use. For my 2" cannon I used a 2 1/4" hole saw then sanded it down to fit the pipe perfectly and added a floating O-ring on back and after about 50+ test shots(no barrel) at various PSI it has yet to crack break or come loose on the bolts, its also very light. Just my suggestion good luck.
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Unread postAuthor: LCTChamp » Mon Apr 13, 2009 8:42 pm

That sounds like a good idea. Would the tennis ball still be too snug if you removed all of the fuzz?
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Unread postAuthor: jmeyer1022 » Mon Apr 13, 2009 8:47 pm

[youtube]http://www.youtube.com/watch?v=75O71AHTIr4&feature=channel[/youtube]

If you look at the beginning of this video, I think even with the fuzz removed it would have a lot of drag cutting down on performance.
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Unread postAuthor: mark.f » Mon Apr 13, 2009 9:54 pm

Did anybody else get distracted for nearly and hour looking at KlugeBoy's new work after watching that video? :lol:
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Unread postAuthor: jmeyer1022 » Mon Apr 13, 2009 10:05 pm

KlugeBoy's Channel is by far the most informative and interesting spud channel for me. He's a great guy too. Everytime I need to reference something I use his stuff, hopefully get him the views he deserves.
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Unread postAuthor: mark.f » Mon Apr 13, 2009 10:32 pm

Yeah, KlugeBoy frequented the Spudtech forums before they went down, and built the dream cannons hosted on his web site (klugeboy.net). I was surprised to see him back... pleasantly surprised.
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