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Will this design work?

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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Unread postAuthor: grumpyoldman » Thu Feb 02, 2012 1:39 pm

Hey, dewey-1. Thanks for taking time to check out the ratios. Yeah. I don't want to go down to 150 psi. It would need too large a tank. This launcher needs to have a sleek design.

I guess I'll go back to the 1" exhaust port. I need to think of other ways to boost the air flow. Maybe a super quick pilot? May add 2 inches to the length of the chamber. That should help with distance a little.

Thanks again for taking time to check it out. I'm really amazed at the quality and quantity of help around here.

I'll go ahead and build this launcher and experiment with it. Anyway, it will give me some experience. I'll keep thinking of how to improve this design or go to a different one.
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Unread postAuthor: grumpyoldman » Thu Feb 02, 2012 1:41 pm

Thanks warhead052. Good idea. Anything that will increase distance is helpful. It all adds up in the end.

I don't know if these launchers would sell but you never know. I'm retired and have time to try it. What are you selling?
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Unread postAuthor: warhead052 » Thu Feb 02, 2012 2:35 pm

I mostly sell airsoft products to friends. Not a big business, but I do make some money.
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Unread postAuthor: mobile chernobyl » Thu Feb 02, 2012 2:36 pm

I'm not sure about a discarding sabot's use in a game environment (I could be wrong and they use it all the time for all I know however) but I wouldn't think that using something that's going to leave waste behind would be good. Instead of a sabot, try thinking outside the box for a second...

What if you rolled the t-shirt up tightly, then slipped a rolled up heavy paper poster over the back of it for stability's sake. something like this?
Image

Sure it would require another part, but the likelihood of it hitting longer range "targets" is greater.

There's a chance the paper tale may try to "inflate" as it leaves the barrel though, so there would need to be some sort of way around this whether it's a strip of adhesive or an elastic strap of some sort?

We're here to help you hit the nose bleed section! they need some lovin' too!
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Unread postAuthor: grumpyoldman » Thu Feb 02, 2012 3:38 pm

Hi mobile chernobyl. Yeah, a t-shirt bullet! Make a projectile type housing like you have with cardboard. A round cylinder, stick the rolled t-shirt inside, fold the bottom and tape. Make a cone for the nose. I'd have to find an easy way to make them. There's has to be a way, just need to find it.

You could have the team's logo or whatever on the outside of the cardboard projectile. Maybe candy in the back for weight!
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Unread postAuthor: quark1980 » Thu Feb 02, 2012 4:15 pm

for some reason making pointy bullets filled with weigt to shoot into a crowd doesnt seem like the best idea....

:shock:
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Unread postAuthor: grumpyoldman » Thu Feb 02, 2012 4:49 pm

A t-shirt becomes a projectile when it is fired and it goes into a crowd. The projectile housing would be a light cardboard or heavy paper. I wouldn't make it out of something that would kill or maim someone.

They wouldn't be pointed. They would be curved on the end. And I was joking about the candy. It shouldn't hurt if cardboard or heavy paper falls on you. There is one way it could hurt you, you might get a paper cut.
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Unread postAuthor: dewey-1 » Thu Feb 02, 2012 6:33 pm

Here is 1/2 scale cardboard-foam construction projectile.
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Unread postAuthor: grumpyoldman » Thu Feb 02, 2012 7:32 pm

I didn't think about foam board. It would hold up better during firing and flight and not tear up like thick paper or cardboard could. This just might work.
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Unread postAuthor: Technician1002 » Fri Feb 03, 2012 12:24 am

The school I worked with in the competition, came up with a relatively simple solution that helped a lot. Simply add a ribbon to the shirt as a tail. The ribbon provides just enough drag on one end to keep it oriented endwise.

This team not only hit the back wall in the stadium, they put one on the roof 5 stories high.

Here is a frame of a t shirt on the way into the stands with a couple of streamers added to keep it from flying sideways. This team can run up to 100 PSI, but they reach their target distance on about 25-50 PSI. They are using my design for a valve.

I guess I'll go back to the 1" exhaust port. I need to think of other ways to boost the air flow. Maybe a super quick pilot? MayI guess I'll go back to the 1" exhaust port. I need to think of other ways to boost the air flow. Maybe a super quick pilot? May add 2 inches to the length of the chamber. That should help with distance a little.

I have a small version with a 1 inch valve. With a 2.7 inch barrel (thinwall 2.5 inch pipe) it is good for about 200 feet

The lack of condensation in the shot is due to the use of low pressure and dry Nitrogen.
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The small model with a 1 inch valve.
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Unread postAuthor: grumpyoldman » Fri Feb 03, 2012 2:40 pm

Much easier than making housing for it. And cheaper. This is most likely what I will do. Thanks a lot!

Sorry for the late reply.
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