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Launch It! Contest on instructables.com

A place to ask general spud cannon related questions.
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Unread postAuthor: goathunter » Sun Sep 02, 2007 11:42 am

I know exactly how it works.He based his design off of a modified sheridan valve. :D The problem with the design is that every 1000 shots(or intermittent failure) you have to replace the o-rings and seals.At least MY PGP it is that way.

http://www.zdspb.com/media/tech/animations/sheridan.gif
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Unread postAuthor: MrCrowley » Sun Sep 02, 2007 3:08 pm

Yeah I saw that, I thought that pen might float your boat JSR, seemed like your type of thing :P
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Unread postAuthor: jackssmirkingrevenge » Sun Sep 02, 2007 10:31 pm



Interesting, looks similar in principle to the way that many gas-blowback airsoft guns work.

I thought that pen might float your boat JSR, seemed like your type of thing


lol thanks ;p
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Unread postAuthor: MrCrowley » Mon Sep 03, 2007 2:39 am

Okay this is as much as im going to do on it, it better be enough:

http://www.instructables.com/id/E77FEVOF5Y3KXN5/
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Unread postAuthor: jackssmirkingrevenge » Mon Sep 03, 2007 2:44 am

MrCrowley wrote:Rifling the barrel on a sypherical object has almost no effect.


I'll have to correct you on that, rifling was used for centuries with round lead balls before non-spherical projectiles were invented - if it didn't have an appreciable effect on accuracy, they wouldn't have bothered.
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Unread postAuthor: MrCrowley » Mon Sep 03, 2007 2:48 am

jackssmirkingrevenge wrote:
MrCrowley wrote:Rifling the barrel on a sypherical object has almost no effect.


I'll have to correct you on that, rifling was used for centuries with round lead balls before non-spherical projectiles were invented - if it didn't have an appreciable effect on accuracy, they wouldn't have bothered.


Haha fair enough, truthfully I had to leave for school in 5minutes and couldn't be screwed searching up to check, I had heard that it had no effect and it had little effect, so I was unsure and just did 50/50 :P

Though what is really the point? I could see it would be helpfull if it worked a kind of a hop-up system to keep the bullets parabola(sp?) as flat as possible over a certain distance.
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Unread postAuthor: jackssmirkingrevenge » Mon Sep 03, 2007 3:14 am

Have a look here.
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Unread postAuthor: MrCrowley » Mon Sep 03, 2007 3:18 am

Oh yeah it just came to me, I remembered watching/reading something about how sypherical objects curve in the air.

What do you think of the instructable? Enough info? I should post it here or at least link to it.
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Unread postAuthor: clide » Thu Sep 06, 2007 6:47 pm

Hey, MrC's Instructable was one of the Instructables in their weekly newsletter of cool new projects. Good work, I think you have a pretty good shot at winning.



Edit: Forwarded the email to you MrC
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Last edited by clide on Thu Sep 06, 2007 7:07 pm, edited 1 time in total.

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Unread postAuthor: MrCrowley » Thu Sep 06, 2007 6:55 pm

Was it really? Could you link me or was it an email? If it was an email could you forward it to me? (mr.crowley45@gmail.com)Thanks.

I've been advertising this thing like crazy on forums, without looking obvious, otherwise i'll get banned. I think im 3rd or 4th for views, but catching up fast and im 2nd for votes I think.
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Unread postAuthor: PCGUY » Sun Sep 30, 2007 11:03 pm

So is this contest over now?
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Unread postAuthor: MrCrowley » Sun Sep 30, 2007 11:07 pm

Sure is, came second and won a shirt :roll:
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Unread postAuthor: PCGUY » Sun Sep 30, 2007 11:12 pm

Just wanted to be sure, so I could unsticky.

Glad you won!
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