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Posted: Sat Aug 16, 2008 2:25 am
by TwitchTheAussie
Designing a new combustion. 8" x 50" chamber. Deciding on the barrel size.

Posted: Sat Aug 16, 2008 5:32 am
by SpudFarm
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 ;)

Posted: Sat Aug 16, 2008 5:56 am
by MaxuS the 2nd
Are you using photobucket Spudfarm?

Posted: Sat Aug 16, 2008 11:40 am
by SpudFarm
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.

Posted: Sat Aug 16, 2008 3:36 pm
by potatoflinger
ITWOST I started working on a paintball launcher that looks like a Barrett .50 cal.

Posted: Sat Aug 16, 2008 3:47 pm
by MaxuS the 2nd
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

Posted: Sat Aug 16, 2008 3:55 pm
by DYI
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:

Posted: Sat Aug 16, 2008 4:00 pm
by potatoflinger
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.

Posted: Sat Aug 16, 2008 4:05 pm
by MaxuS the 2nd
Ahh good, I just love anything that looks like a .50cal rifle.

Posted: Sun Aug 17, 2008 12:35 pm
by SpudBlaster15
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Posted: Sun Aug 17, 2008 1:35 pm
by SpudFarm
SpudBlaster15 wrote:
DYI wrote:60kJ of recoil force
:banghead:

W00T?

Posted: Sun Aug 17, 2008 3:32 pm
by DYI
Spudblaster15 wrote: :banghead:
Okay, slight problem there. Recoil force of ~600J

Happy now? :lol:

Posted: Sun Aug 17, 2008 6:02 pm
by Ragnarok
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:

Posted: Sun Aug 17, 2008 6:10 pm
by MaxuS the 2nd
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.

Posted: Sun Aug 17, 2008 6:43 pm
by DYI
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?