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Gun setup question

A place to ask general spud cannon related questions.
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Gun setup question

Unread postAuthor: natey14 » Tue Jan 24, 2006 4:53 pm

Would this setup decrease fps? I was thinking of having a 4" resevior then reducing it to a 1 inch with sprinkler valve and then going to 2" for the barrel. THis would be cheaper than getting a 2" valve.
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Unread postAuthor: Atlantis » Tue Jan 24, 2006 4:57 pm

This has been covered many times, but I'll humor you. Sprinkler Valves reduce air flow because of their shape and more importantly their size. The 1 inch section causes a bottleneck. Its like pouring a bottle of water out through a tiny hole, making the hole bigger lets more air through.
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Unread postAuthor: darkpyro » Tue Jan 24, 2006 5:20 pm

you can go with a sprinkler valve but i would suggest a 2" ball valve for a cannon of that size :D
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Unread postAuthor: natey14 » Tue Jan 24, 2006 5:49 pm

ok thanks, good to know
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Unread postAuthor: boilingleadbath » Tue Jan 24, 2006 9:30 pm

To tell the truth, it depends appon the specific launcher setup. I suggest downloading the GGDT (check the wiki) and running some numbers... I can be contacted at boilingleadbath via AIM if you need some tech support.
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Unread postAuthor: akaddis » Tue Dec 12, 2006 5:52 pm

no it shouldnt decrease fps

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Unread postAuthor: sgort87 » Wed Dec 13, 2006 2:18 am

What in the hell do you mean it wont affect the FPS? It has EVERYTHING to do with the velocity. Idiot...

A 2" sprinkler has roughly four times the flow of a 1" sprinkler valve. Depending on how long your barrel is, your velocity with a 1" valve could be (very roughly) cut into a fourth of that of a 2" valve.
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Unread postAuthor: MrCrowley » Wed Dec 13, 2006 3:23 am

So is a 2" sprinkler is worth the extra cash if you want a big improvement in velocity or is the improvement not worth it? 4x the flow sounds quite impressive. Does anyone have solid figures?(Not pulled outta their ass)
Someone who has a chrony shopuld do some tests to see the improvement.
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Unread postAuthor: squeaks » Wed Dec 13, 2006 8:46 am

No one bothers to get figures off of stuff like that because 2" sprinklers are so expensive. It's much more worth your time to make a piston valve instead, and we all know a piston valve is MUCH more powerful than a sprinkler valve anyday.
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Unread postAuthor: sgort87 » Wed Dec 13, 2006 10:03 am

You got it. Or get a mauler valve! :P
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Unread postAuthor: jrrdw » Wed Dec 13, 2006 4:00 pm

Thats it, buy a Mauler valve. Then give us some feedback on how good it works.
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Unread postAuthor: frankrede » Wed Dec 13, 2006 6:17 pm

Ya get or build a piston valve, then make them sprinkler valve actuated.
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