SpudFiles

added video of 10 second upshot.
[youtube][/youtube]

Mike
Sureshot Inc. / http://www.ultimatespudgun.com/

jagerbond wrote:added video of 10 second upshot.

Mike
Sureshot Inc. / http://www.ultimatespudgun.com/

Great hang time.

Just for grins, here is my little 54 cu in launcher with the way oversize barrel.
It doesn't even compare in hang time.
[youtube][/youtube]
I'll have to try later with the larger tank 2 inch version..

try it again with a SOLID LEAD BALLLLLL!

Moonbogg wrote:try it again with a SOLID LEAD BALLLLLL!

Um, you try it and post the video.
I don't have a lead ball that caliber, but I do have tennis balls.

Video Redux More TV's, shooter+target angles, 1/8" Plate steel, cinder blocks.

[youtube][/youtube]

Most of the added scenes used TBs with H20

Mike
Sureshot / http://www.ultimatespudgun.com

Nice you should have a go at the steel using a dart shaped projectile in a sabot.

Recoil doesn't look too bad either, substantial but manageable.

Technician1002 wrote:

Moonbogg wrote:try it again with a SOLID LEAD BALLLLLL!

Um, you try it and post the video.
I don't have a lead ball that caliber, but I do have tennis balls.

Oh..I think it would rip my arm off.

I wonder how a Minie ball style round would work?

http://en.wikipedia.org/wiki/Mini%C3%A9_ball

USGF wrote:I wonder how a Minie ball style round would work?

Not very well unless the barrel is rifled, or the a significant portion of the base is hollow.

Anyone rifle a round and shoot through Spudgun smooth bore with success? I know the Brenneke's work well out of my Ithaca model 37 deerslayer.

http://www.brennekeusa.com/

Mike
Sureshot / http://www.ultimatespudgun.com

jagerbond wrote:Anyone rifle a round and shoot through Spudgun smooth bore with success? I know the Brenneke's work well out of my Ithaca model 37 deerslayer.

Brenneke slugs flying straight has a lot more to do with the lightweight tail than the "air rifling".

I would like to design some "testing" rounds, to help document/develop performance modifications. Some initial thoughts were to upsize airgun pellet designs in UHMW.

Mike
Sureshot / http://www.ultimatespudgun.com

jagerbond wrote:I would like to design some "testing" rounds, to help document/develop performance modifications. Some initial thoughts were to upsize airgun pellet designs in UHMW

Shotgun slugs are a good place to start if you're making projectiles for a smoothbore barrel, after all most of them are designed to be stable without being rifled. I've seen shotgun slugs that replicate the airgun pellet "diablo" shape, here's a similar one:



The critical design feature is the hollow tail which puts the centre of gravity well forward enabling it to fly straight. Foster type slugs work on the same principle:



Don't bother with the "air rifling", in shotguns it's mainly done to enable the slug to compress while passing through the muzzle choke without blowing the barrel off.

Here's one you can easily makefor a 3/4" barrel:

JSR, How would this design work? This for rifled 1.5 inch sched 40 barrels. Volume is 1.89 cu inch. It would weigh about 3/4 lb in lead. The red dot is center of gravity. The nose could be made sharper, this would move CG forward. Could be scaled up or down.

Nice rendering

That should work well even without a rifled barrel, and a sharper nose would both add stability and increase aerodynamic efficiency and penetration. What's the material and construction technique you had in mind?

Also, would it not be simpler to have the projectile made foster-style as a straight walled cylinder? Perhaps with the body slightly turned down to reduce barrel friction, something like this: