Triple-Bearing 12ga Shotgun slug

10% of remaining energy was not the statement; 10% of its energy was. But let's not get too serious - my comment was humorous, not a physics lesson. As in: "does the negative energy harsh the vibe . . . " And "perpetrating mocha machinegun" instead of perpetual motion machine. Your "10% of remaining" is also parodied in my comment about Zeno's paradox - which is also humor, rather than physics or math. Don't let me start about string theory!

George Steele

Well the 10% is of its current energy, not original energy. So after 10 yards you have 90% of original. After 20 yards you have 81%. After 30 you have 73%. After 100 you have 35%. (0.9^10)

John M

In the video the center was spinning. You don't need a non-spinning center for accuracy!

John M

Ah - Zeno's paradox. So it never goes past 100 yards, but it never stops moving, either. Sorry about the tongue-in-cheek comment above - maybe the weather pattern blew in some, ah - smoky - California air . . . Can't wait for the video where you shoot ping pong balls at a gelatin block . . . (;-)

George Steele

Looks like about a 7mm shaft. 25gr. of longshot. FS12 gas seal, an x12x gas seal on top of that, and a MEC shotcup on top of that. The tape helped snug it against the rifling and gave it some traction so we wouldn't have any slippage. I think the bearings and shafts were from vacuum cleaners.

TAOFLEDERMAUS

It's easier to visualize a ping pong ball. You can launch it 1000 fps but it's going to bleed off energy very quickly. A slug or bullet bleeds energy fast too.

TAOFLEDERMAUS

Wait - it loses 10% of its energy every 10 yards? So at 110 yards it turns into anti-matter? Does the negative energy harsh the vibe of anything it passes by? Since the mass is constant, does it return when it hits 200 yards because the energy is the same, but in reverse? Or does it oscillate in space forever like a perpetrating mocha machinegun round (I think that's how you say it in your language)? I'm glad I studied physics . . . And yes, you should try shooting batteries - although you should disconnect the cables and tighten the caps first. Please send me a singing telegram with the answers to these questions.

George Steele

Blue smoke means its a girl??? Only in Trans Kalifornia!!! On a more serious note, you may have just stumbled on the most accurate projectile ever made for a shotgun. The spinning three outer rings (bearings) around a non-spinning central shaft would emulate a spinning gyroscope, which all of us aeronautical engineers know is the basis for inertial navigation... and more importantly, children's toys. Whilst the ballistic coefficient would be akin to a .38 spl wadcutter (or worse), I think the accuracy at 100, or even 150 yards, would put a huge smile our faces. Now for soe questions: what is the diameter of the shaft bearing assembly itself; what is the length; what is the part number and where can it be purchased? Finally, what was your starting/ending powder loads for this? Please PM me if necessary, as a highly accurate projectile like this has useful applications at short to medium range. Thanks, Jeff!

Shoot grandma's ashes again, that was cool!

Ysbrand van der Werf

Neat Slug hope McMaster-Car has some in stock.

Gary A