SpudFiles

edit:(the strange lighting makes the heads of the bullets look tilted, this is not the case)

Video:
[youtube][/youtube]
shot at 100 psi, with a 0.5'' porting coaxial piston valved cannon.
chamber to barrel ratio is setup for minimal firing sound.

Similar to other compound rounds offered by our sponsors.
Not as good, but cheap.

This was made by heating a round headed bolt, with a lighter, and forcing it into a nylon spacer.

The Center of gravity, can be changed by changing the length of the bolt.

all estimates for a .50 cal round
Cost: about $0.30 (USD)
Build time: about 45 seconds to heat the bolt.
Durability: bolt has not fallen out, after 10-12 shots into steel plate.
(shot taken with at 100psi .50'' porting coaxial cannon I am working on.)



DAMAGE PICS
can:



1/2' press board shelf:


Steel baking pan:

Wouldn't it be neater to just drill a hole and screw the bolt in? Also, does the bolt head fit exactly in the barrel? If so, doesn't the fact that the nylon part is smaller diameter mean that its unstable in the barrel and therefore inaccurate?

Oh, and damage pics. what happened to the steel plate

there is a hole in the nylon spacer, drilling and tapping would work. But i do find this heat method to work just fine.

the difference between the bolt head diameter and the nylon spacer diameter is less that the photos make it look.
(about 2 thicknesses of electrical tape)

Bolt head is VERY close to barrel ID

Pics and video coming in new cannon thread in the next few days.

wow that is a very simple damaging ammunition cant wait for damge videos and pics.

How straight does it fly?

POLAND_SPUD wrote:
Anything is possible with the proper 3-way valve.

Could someone PM PcGuy to put that on the main page ?

Every shot hit the target with the head of the bolt.

When shooting into an old fridge radiator assemble, the bullet seems to impact near perfectly straight.

Ranges tested are apox: 15-45 feet.

More long range test will be done in the next few days.

Where did you get the nylon spacers?

Ace hardware right next to the bolts.

Simply ask a hardware store associate were they are located.

POLAND_SPUD wrote:How straight does it fly?

POLAND_SPUD wrote:
Anything is possible with the proper 3-way valve.

Could someone PM PcGuy to put that on the main page ?

I don't think those words ever came out of your mouth EXACTLY like that... But it sounds like something you would have said. Haha

hear in aus you can get them at trailer shops, i was thinking of using them as cartridges for a semi.

Damage pics are here:

Pop can:




1/2' press board shelf:



Steel baking pan:




The round then withstood 2 shots into thick (1/2'') steel plate until...
Destroyed round:

Really nice. I have to try these now. Can we get a video?
It might be easier to use standard hex bolts cause they dont have that square under the head, which must have been hard to push in to the nylon, and it probably causes a lot of stress. But hex bolts would be less aerodynamic.
Dont your hands burn from touching hot metal?

shardbearer wrote: Dont your hands burn from touching hot metal?

I used pliers..?!?!

also, video soon.
EDIT:
[youtube][/youtube]

Not bad at just 100 psi - will you be ramping it up?

yes.
i plan on running 150 psi. Lowest rated part on the gun is rated for 360psi

But, I am going to try using these rounds in a 650psi QEV cannon to see what they can do.