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"In the world of spuds today"

A place to ask general spud cannon related questions.
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Unread postAuthor: FighterAce » Mon Aug 02, 2010 2:38 pm

Gun Freak wrote:Ah, thanks man. Much appreciated, I would've spent 15 bucks more for nothing.


I've spent 40 bucks for nothing :roll:
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 02, 2010 2:47 pm

FighterAce wrote:I've spent 40 bucks for nothing :roll:


You would have been better off buying a fridge pump ;)
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Unread postAuthor: FighterAce » Mon Aug 02, 2010 3:41 pm

Not... then I'd have to carry the fridge pump and a battery. Thats not ideal when you already have 15 kilos on your back.
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 02, 2010 3:48 pm

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Unread postAuthor: FighterAce » Mon Aug 02, 2010 4:47 pm

Overkill on the pressure - that thing can go to 200 bar, I only need 40-50. And if goes to such high pressure then you're gonna get very little volume. If you're going high pressure and higher volume you're better off making your own pump to suit your particular needs.
Btw. didnt we go off topic or something? I'm not even sure what this topic is all about... the title is not very self explanatory.
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Unread postAuthor: Gun Freak » Mon Aug 02, 2010 5:45 pm

@Fighter Ace,
Biopyro wrote:In The World Of Spuds Today.
This thread is perfect for progress not significant enough for it's own thread.

:wink:
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Unread postAuthor: Zeus » Wed Aug 04, 2010 5:11 am

ITWOST, I found 80mm aluminium camlocks, for only $80AUD the set.

And the forum has ASCII haxoring available.

W00t Ñ→®O☻
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Unread postAuthor: MrCrowley » Fri Aug 06, 2010 7:01 pm

ITWOST, just spent $40NZD ($30USD) on a meter of tennis ball barrel (65mm PN12 PVC). :(
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Unread postAuthor: spudtyrrant » Fri Aug 06, 2010 7:38 pm

Zeus wrote:ITWOST, I found 80mm aluminium camlocks, for only $80AUD the set.

And the forum has ASCII haxoring available.

W00t Ñ→®O☻
ITWOST you got ripped off, i can get 75mm locks here for half that price
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Unread postAuthor: Zeus » Sat Aug 07, 2010 1:39 am

I don't intend to buy one, anyway this is Australia, everything costs more.
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Unread postAuthor: al-xg » Sun Aug 15, 2010 12:56 pm

IWOST (er well, in fact, last week but I took the picture today :))

Lead pancakes!
Image
Image

14mm home cast lead bullets, fired from a rifled spring loaded ball valve pneumatic (~450psi), met a cast iron plate at relatively short range (10-20m)
Bullets were about 20mm long before impact.
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 15, 2010 1:22 pm

Nice! Any idea of how fast they were going?
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Unread postAuthor: SpudFarm » Sun Aug 15, 2010 2:03 pm

I know that game!
Image

Your pancakes look better though.. When I shot sand I only got a mushroom and when I shot sheetrock all the "paddles" flew off in all directions..

I have never managed to thoroughly pancake a lead slug out of my pneumatic though. I only have access to 150psi :/

Any videos?
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Unread postAuthor: al-xg » Sun Aug 15, 2010 3:30 pm

Err I'm not too sure, I haven't really done any measurements on that spudgun.

It really depends on how fast my ball valve is opening, im guessing 30-40ms max as I've never seen it taking more than one frame to open on video.

I just tried estimating velocity with ggdt, and it seems to predict 130-140m/s, but I could be way off as I don't accurately know chamber volume projectile weight, valve Cv or opening times ;)
That seems quite low, especially compared to previous airguns I built, but I was noticing rather long flight times.
Damage on target is quite impressive but that might just be down to heavy stable projectiles.

Spudfarm those are massive ! :shock: Recoil must be considerable.

Nothing too interesting on video, I hope to get one done before next WE, but then after that I'm back off to the UK and won't be near any airguns for a while.
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Unread postAuthor: SpudFarm » Sun Aug 15, 2010 3:45 pm

130m/s on a slug like that is very impressive. It is quite hard to get lead up to speed in a spudgun.

Try to make a box'o'truth and shoot with those slugs. That is a quite good way to compare your guns performance to, well any gun really :P

The slugs on the picture was fired from my hybrid (Currently mounted to a floor) so recoil is no problem. If you look at the hybrid thread: I am going to make new mounts for it, those I use now are horrible :P

Edit: if you want higher velocity you can bore out the back (Helps stability to) to reduce weight a bit. Doesn't look like you did that on those slugs.
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