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Small caliber spud gun/ Nerf gun

A place to ask general spud cannon related questions.
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Re: Small caliber spud gun/ Nerf gun

Unread postAuthor: Stormling » Sun May 15, 2011 4:56 am

jackssmirkingrevenge wrote:
Stormling wrote:I'll actually use it but I sorta need the trigger not inline with the tank so I can mount it, thats why I was going with the modified valve.


A diagram of your intended configuration would help us help you ;)

So I'm correct in thinking that if I get a blowgun with a good flow, i pump up the tank stick in the dart and pull the trigger I can fire.


Pretty much.

I think a blowgun triggered QEV would be a good choice


Most people don't realise that with a decent barrel blowguns used directly make pretty good valves. I did this with this:

Image

Add a properly set detent and it has the potential to be more powerful than any piston valve.


I have definitely found the type of valve I need thanks or the help.
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Unread postAuthor: Stormling » Sun May 15, 2011 4:57 am

I'll see if a can post up some diagrams of my original design as well.
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Unread postAuthor: Stormling » Mon May 16, 2011 1:59 am

Btw if you could give me some info about the valve in that pic that would be great.
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Unread postAuthor: jackssmirkingrevenge » Mon May 16, 2011 4:23 am

Stormling wrote:Btw if you could give me some info about the valve in that pic that would be great.


It's just a common blowgun valve, you can get a similar one for peanuts off eBay.
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Unread postAuthor: Stormling » Mon May 16, 2011 4:39 am

Thanks for the help.
Do a need a barrel that big though.
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Unread postAuthor: Labtecpower » Mon May 16, 2011 4:48 am

Stormling wrote:Thanks for the help.
Do a need a barrel that big though.


depends on when you're satisfied. more barrel = more power (to a certain degree)
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Unread postAuthor: Stormling » Mon May 16, 2011 4:50 am

Labtecpower wrote:
Stormling wrote:Thanks for the help.
Do a need a barrel that big though.


depends on when you're satisfied. more barrel = more power (to a certain degree)


So I can just keep cutting of bits till Ii'm at a happy medium with length and power?
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Unread postAuthor: Labtecpower » Mon May 16, 2011 4:55 am

yes. but you lose power with every bit you cut off.

have a play with this if you want to see figures.
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Unread postAuthor: Crna Legija » Mon May 16, 2011 5:00 am

yea but then if you lop off to much you need to buy a new one. you should use GGDT read the instruction on the sit on how to use it and if your using vista run as admin or it wont work.

set the valve to generic, seat dia about 0.5 cm, opening time 15ms and dwell about the same(guessing but should be around that), then play with pressure and barrel length

edit ahh to slow
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Unread postAuthor: Stormling » Mon May 16, 2011 5:06 am

Crna Legija wrote:yea but then if you lop off to much you need to buy a new one. you should use GGDT read the instruction on the sit on how to use it and if your using vista run as admin or it wont work.

set the valve to generic, seat dia about 0.5 cm, opening time 15ms and dwell about the same(guessing but should be around that), then play with pressure and barrel length

edit ahh to slow

10 ms then
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Unread postAuthor: Crna Legija » Mon May 16, 2011 5:16 am

Stormling wrote:
Crna Legija wrote:yea but then if you lop off to much you need to buy a new one. you should use GGDT read the instruction on the sit on how to use it and if your using vista run as admin or it wont work.

set the valve to generic, seat dia about 0.5 cm, opening time 15ms and dwell about the same(guessing but should be around that), then play with pressure and barrel length

edit ahh to slow

10 ms then


no i was to slow to get u the info not teh valve
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Unread postAuthor: Stormling » Mon May 16, 2011 5:22 am

No not really you gave me an excellent springboard.
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Unread postAuthor: Labtecpower » Mon May 16, 2011 5:26 am

you was too slow to give the GGDT info, but I didn't give valve info. I recommend a seat dia of about 0,2 cm. There are a lot of twists, turns & holes in the blowgun guts.
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Unread postAuthor: Stormling » Mon May 16, 2011 5:57 am

So i'm still gonna need some designs/help with a tank.
I'm now going for a 75-100 psi tank on recommendations from Jackssmirkingrevenge. I'm only getting messages saying that the projectile has not left the muzzle so i'm hoping with more experimentation with the program I can get success.
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Unread postAuthor: Crna Legija » Mon May 16, 2011 6:01 am

get a screen shot of ggdt for us to see.
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