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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: TwitchTheAussie » Sat Aug 16, 2008 2:25 am

Designing a new combustion. 8" x 50" chamber. Deciding on the barrel size.
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Unread postAuthor: SpudFarm » Sat Aug 16, 2008 5:32 am

UPGBH10x was fired numerous times at 7x yesterday and the comming pictures is the LAST you ever get from this until i post it.

well i can't upload the pics.. i get the

"Upload Error: Could not upload Attachment to ./files/img_2008_147.jpg.
Upload Error: Could not upload Attachment to ./files/img_2008_147.jpg."

messenge :S

help me cause i think you want to see it ;)
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Unread postAuthor: MaxuS the 2nd » Sat Aug 16, 2008 5:56 am

Are you using photobucket Spudfarm?
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Unread postAuthor: SpudFarm » Sat Aug 16, 2008 11:40 am

Image


Image

you reminded me Max :)

it is 8" of solid wood, about half the thicknes is gone since it tore the back off, the grooves in the ground if REALLY deep and are from one buckshot and the other is the slug that went through the wood.
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Unread postAuthor: potatoflinger » Sat Aug 16, 2008 3:36 pm

ITWOST I started working on a paintball launcher that looks like a Barrett .50 cal.
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Unread postAuthor: MaxuS the 2nd » Sat Aug 16, 2008 3:47 pm

potatoflinger wrote:ITWOST I started working on a paintball launcher that looks like a Barrett .50 cal.


Two questions..

1) High Pressure?
2) How long till completion?
3) Do you have a camera? :D
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Unread postAuthor: DYI » Sat Aug 16, 2008 3:55 pm

ITWOST, I realised exactly what 60kJ of recoil force will do to a poorly constructed stand, and that the sparkplugs I'm using weren't designed to survive 3000psi...

I also learned that 10 year old bags of concrete mix apparently don't make very good concrete :roll:
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Last edited by DYI on Sat Aug 16, 2008 4:07 pm, edited 2 times in total.
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Unread postAuthor: potatoflinger » Sat Aug 16, 2008 4:00 pm

MaxuS the 2nd wrote:
potatoflinger wrote:ITWOST I started working on a paintball launcher that looks like a Barrett .50 cal.


Two questions..

1) High Pressure?
2) How long till completion?
3) Do you have a camera? :D

That's three questions :wink:
It will have a steel chamber, so I may take it to 300 PSI.

I am saving my money for a truck, so it may take a while (a month probably)

Yes, I do have a camera.
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Unread postAuthor: MaxuS the 2nd » Sat Aug 16, 2008 4:05 pm

Ahh good, I just love anything that looks like a .50cal rifle.
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Unread postAuthor: SpudBlaster15 » Sun Aug 17, 2008 12:35 pm

DYI wrote:60kJ of recoil force


:banghead:
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Unread postAuthor: SpudFarm » Sun Aug 17, 2008 1:35 pm

SpudBlaster15 wrote:
DYI wrote:60kJ of recoil force


:banghead:



W00T?
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Unread postAuthor: DYI » Sun Aug 17, 2008 3:32 pm

Spudblaster15 wrote: :banghead:


Okay, slight problem there. Recoil force of ~600J

Happy now? :lol:
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Unread postAuthor: Ragnarok » Sun Aug 17, 2008 6:02 pm

DYI wrote:Happy now? :lol:

Joules are still energy, not force! :P

Mind you people talking about the power of a rifle/whatever in Joules is also inaccurate.
Oh well, can't have everything. :wink:
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Unread postAuthor: MaxuS the 2nd » Sun Aug 17, 2008 6:10 pm

Anyone know where I can get a 250mm piece of 90mm Delrin rod?
Uk only really.

Edit: Never mind, seems it's also known as Acetal.
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Unread postAuthor: DYI » Sun Aug 17, 2008 6:43 pm

Joules are still energy, not force! Razz

Mind you people talking about the power of a rifle/whatever in Joules is also inaccurate.
Oh well, can't have everything.


Once again, I'll rephrase it to appease the resident pedant(s):

The entire 100kg assembly recoiled at a speed of roughly 3.5m/s on firing, giving it a kinetic energy of ~600J, about 1/100th of what was imparted on the projectiles. :P

Also, how is using Joules when talking about the kinetic energy of the projectile fired from a rifle inaccurate? What unit of energy would you use?
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