No expert but the fluting on the round + the rifling on the barrel might have ove rspun the round causing the cork screw motion. I'd love to see how true it flies through a smooth bore if you have any more rounds. Thanks again folks and have a good one.
the weirdest part of this video is how it seems to speed up for the breefest moment when it gets going straight and the extra speed seems to throw it back off again. It looked to move just a little bit faster on the high-speed
Na bro thats her you dont finish nor please me stick so when your sleeping shes completing all your takin for granted might wanna watch the house for a paco oit the back when you pull in unless your part of it then im sure youd know what the deal was lol
If you ever run into a kung-fu master who says they can catch bullets, fire one of these at them. They won't know where the hell it's going till the last moment.
Merlin Magnus... Kung Fu masters? LOL! Claiming to be able to catch bullets? LMFAO! They KNOW that - ! NO ONE ! - would fire at them and risk murder, attempted murder, or assault with a deadly weapon charges. Challenge ANY of them to mount a firearm and rig it with a remote trigger that they activate themselves! --- AND! Have an independent verify that the weapon functions as designed, is loaded with 3rd party supplied ammunition.... In other words, verify that no gimmicks, rigged equipment, or ammunition is used! LOL! See how many take you up on the challenge. They are con artist and b******* specialists.
I wish you guys would have took one shot through a smooth bore just to see if the corkscrew action was from the rifling or from the flutes on the bullet.
@the Psycho Superman Blue Falcon is the military nickname for a Buddy F**ker (someone who screws over his buddies, not actually f*cks them...except in the Navy 😉)
WOW. I just realized you have 1.26 MILLION subscribers now! I had no idea how fast this channel was growing. I watch it almost daily but never look at the subscriber count. Last time I checked you had less than 500,000. Congratulations!!! I love your work and look forward to your continued success.
The bullet's movement absolutely reminds me about the Dzhanibekov effect. The few moments of stable flight followed by the spinning, with then again stable flight are so reminding of that, even tho it could not be directly related as the bullet has a symmetry that makes it have only two main axes of inertia... So interesting though, it could be something related
I was looking for a good way to describe what it's doing, and I first thought of the Dzhanibekov Effect, but that's not quite it. The Dzhanibekov Effect occurs when something that has three distinct moments of inertia is rotating about the "medium" one, and this shape should only have two moments of inertia.
Hello Buffalo! Cool seeing you here! Not gonna lie I had to look that big word up... it does look similar to that, almost like it's trying to change direction or something.
@@alextownsend3264 no measurement just pics. All I was concerned with was getting it back fast and alive. It was 4lb for sure. Possibly 5. Wish I could post pics here lol.
Interesting design, he should try to move the spiral grooves to the rear of the projectile creating a lil drag and making the front smooth. Then add a bit of weight to the front, perhaps throw a few BB pellets in there, that could stabilize the blue falcon.
HARDWARE STORE CHALLENGE: Greg, OG, and Danny go to the local hardware store and see who can build the best flying slugs. using only items found in the hardware store each man builds 6 identical slugs and test them head to head against the competitors. BONUS POINTS AWARDED FOR CRAZY SHIT,...I.E: fin deployment, discarding sabot, liquid core, pedals, etc.
I’d just walk casually over to the ammo counter, lean seductively across it, and pull out my cash while winking at the clerk. I’d smile coyly while he bagged up a box of 1ounce slugs, then I’d stroll out the door having won the competition without even trying.
They could also have a poor center of gravity. If the plastic is dense in the wrong place it could very well be trying to rotate around that and causing the odd corkscrew effect.
This is where supersonic aerodynamics come into play and you would need to design for a specific velocity range. Shock drag is created when the air is being compressed at supersonic speeds. Viscous drag is created by the flow of air over surfaces and, critically, in what is called boundary layer separation (which is why the boat tail on bullets is used and improves stability) - basically when the object moving through the air tries to pull a vacuum as it moves faster than the static air pressure can force air to cling to the surface. For any given velocity, there is an angle optimized to reduce shock drag, and when taken as a function of diameter, a conic section which prevents flow separation at a given static pressure (altitude). This is why forward-swept wings exist on some aircraft - the sweep of the wings applies to both the reduction of shock drag and viscous drag. So if you had a projectile which went fast enough and was short enough, the shock cone would close behind the tail of the bullet. This thing is probably approaching that, at least at muzzle velocity. But, yes, generally, the stability would be better with these flutes at the tail end. Or just along the rear of the body and into a short "boat tail", as a full sweep into a tail would be a waste of space and material for negligible gains.
@@ahalfsesameseedbun7472 There were a few. The Germans tried one which the wings ripped off of, if memory serves. The X-29 was an American tech demonstrator, which is extremely maneuverable. th-cam.com/video/v-8MVnPHzio/w-d-xo.html The Russians also built the SU-47, which to my understanding is mostly a tech demonstrator and not a production aircraft.
This! I knew I'd seen this kind weird unstably stable spinning before, alternating between spinning and tumbling, but I couldn't remember where. It's not exactly the same, but it's close enough that it probably shares some physics.
@Gary Daniel It IS tumbling, but in a semi-controlled way. As @Dwayne Etchison pointed out, its tail kept hitting it's own shock cone, thus it stays in it's trajectory. No doubt, has it fallen below mach 1 it'd be tumbling uncontrollably
I believe that the grooves at the nose most likely gave them that "cork screw" flight path. Very amazing that flight path on slowmo that is so weird, you dont see that everyday at the shooting range :D OG surprised us again with that finger wiggle "that was already there", those jokes work only when they "come out of bushes" at the viewer in my opinion for me at least, since I pretty much know to expect those when ever I see OG in your videos.
@@chasebh89 finding a moment of stability in between each flip also. Perfect example of the IAT. Maybe the rifling is too tight? Seemed like it was spinning and thousands of RPM.
side effects of getting hit with this slug: 1: your sgt finding out you weren't really at dental 2: having staff duty over a 4 day weekend 3: getting stuck on chute shakeout
yahwehsonren a blue falcon is military slang for a buddy f@cker. Generally means someone did something that ended up screwing someone over or tossing someone under the bus. You DONT want to be a blue falcon. They usually get the full metal jacket treatment.
I would be interested to see the spiralled flutes going both in the direction of the rifling as well as opposing it. Also potentially smooth bore and different powder loads
It seems as though the weight of these rounds have more to do with the flight than anything else. Looks like there is not enough spin to be spin stable (rifled barrel).. so they begin to lose form, beginning to tumble. But the weight of the projectile seems insufficient to overcome the increased aero drag of tumbling, forcing the projectile back towards a spin "stable" condition, where the issue repeats.. Reminded me of the Dzanibekov effect in flight... I think they'd tumble if they were heavier.
I feel like those would work great if a bearing or a small dollop of lead was encased in the resin to give it some mass. That would probably reduce or eliminate the corkscrew effect.
Still watching, but I gotta say, I was already grinning as I clicked the notification: on my screen the thumbnail looked like you were holding a blue tampon.... X'D poofff =D X"D Thanks for uploading great content, as always! It's a good sign because it means that covid hasn't gotten you down. Stay safe and dry, just like your humor! ^^
That's a very interesting resin to try other shapes or combinations with... __disclaimer__ semi-pseudoscientific mumbo jumbo below. Read at your own risk. General frequency theories applied to a ballistic object under fluidomechanical influence without peer review. For entertainment purposes only. __--__ The corkscrew motion looks to be regular, which could indicate a combination of 2 different frequencies... (the motion is in fact a lissajous figure) which makes sense: the spin from the fluting and the spin from the rifling. You say the round stays stable first, which makes sense too because supersonic there's no aerial impact on the fluting and only the rifle spin works on the round. Because the round is so light, it probably decelerates quickly, and once subsonic, the fluting starts fighting the rifle spin. That's what causes the corkscrew motion. As it gets more air pressure on the fluting, the rifle spin may eventually disappear altogether as the flute spin gains more strength. (and funny enough, this would indeed make the spin more stable at longer distance, but by then the speed is so low that the motion will still not stabilize anyway. And this is what you saw with the rifle choke: less rifle spin so it wore off faster against the increasing strength of the flute spin, showing a straight but unstable flight at the end without corkscrewing) I think the concept of this round could be improved if the rifling, the fluting and the speed could be in sync. I'm supposing there are not much options in changing the rifling, so the other 2 must be made to match. The rotation speed of the fluting spin at the speed of sound (which is when it kick in) should match the rotation speed given by the rifling.The latter depends on the speed in the barrel... "That's a lot of math"...
So nice to see how the spin of the rifling and the spin caused by the fluting interfered to create this helix drift. ^^ If the projectile had been shot through a smooth barrel it probably would have tumbled all the way as it did with the choke. If the rifle twist had matched the angle of the flutes the little guy would probably flown off everywhere because both spins would have resonated and amplified each other ad infinitum.
there are 2 frames in the video where you can see it lighting up like a lighbulb upon impacting onto the lead plate (7:55 the 2 frames right before it explodes into a bazillion pieces)
F=m*a, 11,500 psi times 0.41 bore area = 4715 pounds force or 21000 Newton. 21000N/0.0091kg projectile /9.81m/s2 gravity = 235,000G's of acceleration!!!
That's not what I get. V0 = 0 ft/sec V1=2000 ft/sec. Barrel is ~ 2ft. Average speed is 1000 ft/sec. Time in barrel is 2/1000 = 0.002 sec. A = (V1 - V0)/t = 2000ft/sec / 0.002 sec = 1,000,000 ft/sec^2. 1 g = 32.2 ft/sec^2 1,000,000/32.2 = 31,000 G
@@SquireJethro Yeah that would be the average acceleration. But acceleration/pressure in the last half of the barrel is minimal compared to the first few inches at full chamber pressure. My math is for the peak G force at the first couple of inches of acceleration.
@@Phoenix88. Yes! Colonel Hathcock did extensive tests chopping down barrels to see the effect. Down to about 6", a 12 ga. doesn't lose as much velocity percentage-wise as it does in barrel length. 1/2 the barrel length leaves 90% the velocity. That puts most/all the acceleration in the first few inches. Same with pistols; most of the delta-v is in the first two inches.
Holy Crystal Cracking Piezo Electric Light Batman! at 7:55 there's a frame where you can see the Piezo effect cause a flash in the projectile when it impacts the lead plate - Destin at Smarter everyday would dig that! Probably Steve Mould Too. Those have a crazy oscillation in their flight paths. Great Video Gentlemen as usual! : D
Good to see you guys are still kicking out there. I subbed to my boy officer Greg. Thank you guys. I don't always comment but I'm always watching. Much love, from your friend in Hawaii, Thomas. P.S. yo Greg, I'm still waiting for your happy ass to float on down here. Holler when you any of you guys finally make it to the big island. 🤙🏾🤙🏾🤙🏾🦆🔥
I can only conclude that this effect is similar to the zero G t-handle effect. This is where an object suddenly changes direction while quickly rotating. In this case, it appears that air resistance/pressure exerted prevents that change in direction, and instead, physically, deflects it. Thus the back and forth "jumps". This is an extremely interesting video. I think people should take note of these implications.
It looks like it needs more friction against the sabot. The rifling is spinning the sabot, but it's losing grip on the projectile and spinning around it
@@mattelder1971 Now THAT is interesting... I mean, I knew the combination could make parts that don't break just because you look at them wrong...but I didn't imagine it was to _that_ extent. 🤔
@@Bakamoichigei To be fair, they used a lower model that I designed specifically to survive being used when printed in PLA, so anything stronger than that will work nicely. But yeah, there are at least a couple out there that have been made with that combination of resins.
@@TimothySielbeck i think that has to do with the angle that the speed is measured at. If it isnt measured directly in line with its path itll appear to increase in speed as the angle decreases, similar to how a car will appear to decrease in speed as it approaches and you begin to measure the speed more and more from the side.
The slow-mo never ceases to amaze me how projectiles end up flying in practice vs theory. All the stuff you would think seems really aerodynamic always ends up doing some crazy erratic stuff. And then the funky shaped weirdo stuff ends up flying straighter than an arrow. It's incredible what happens at super sonic/sub sonic speeds.
Oh man. I used to teach indoor small bore to kids. We used the "police bay" at the local range when it wasn't in use. It was the only bay out of four with holes through the roof. (And it sure as heck wasn't because of the kids)
Not only is it made from resin, it's also 3D printed! You can see that by the little imperfections at the bottom. That's where the supports were attached to.
I wonder if Michael could fill the mold with some small lead shot and then pour the resin over it? Just to add some weight... Or maybe a tungsten core or something.
@Taofledermaus just a curiosity? Obviously any lays or lats on the projectiles surface will encounter resistance from hydrodynamics en route to the destination, precise uniform density must be maintained to avoid weight shift, and a variance I’m not certain anyone questioned... are the lats and lays on the round, rifled the same direction as the rifle’s bore? If the projectile is cut counter directional to the bore rifling it may cause the anomalies in its trajectory.
At exactly 7:55 there's that flash - it's always with the lead plate. @Taofledermaus, you should do a video trying to capture this phenomenon and let's see if we have any plasma physicists who can weigh in. It's really intriguing - on top of all the other cool stuff you're doing!
Wow! Never seen a projectile cavitate like that through the air. I wonder if moving the center of gravity forward or backward would make a difference. It almost looks like it wants to tumble but recover at the same time.
The spiral cuts on the round suggest subsonic stability. Supersonic causes the spiral cuts on the tip to catch just enough air to throw out the center of mass, but because the cuts are symmetric, they create a defined & mostly predictable corkscrew flight pattern.
Just joined OG's channel.. I can't understand how I haven't got around to it.. Been working too much I guess.. But now I have OG-videos to entertain myself with and some beer and pork chops!
The corkscrewing looks a lot like intermediate axis tumbling (Dzhanibekov effect) getting corrected by aerodynamic forces. This suggests that the rounds are not of rotationally symmetric mass distribution, but it might also just be that the material is much too light to be stable under the asymmetric aerodynamic forces introduced by the fluting and other imperfections. I think the rapid dissipation of its angular momentum (light mass vs drag) might also lead to the tumbling force as even rigid rotationally symmetric bodies tumble on their major axis (the lowest energy state) if there's a mechanism dissipating angular momentum.
Do you want to shoot a Blue Falcon?
Vets everywhere: “very much”
Walkin' through the desert,
Dyin' of thirst.
So I took my buddy's 2-quart.
Cuz' I come first.
Pretty much every vets first thought lol
😂😂😂
@@traviscecil3903 you have been taxed one marching jody.
And here I am, just sitting here, watching all these references go over my head.
Me: huh, that's a cool looking slug.
My brain: eat it
Me: what? no, that's-
My brain: eat it
Me: why-
My brain: you gotta
Just a lick...
Just the tip...
@@Uberragen21 and only for a minute
so thats how kurt Cobain died
It looks like a gummy bullet
Probably some of my favorite slow mo shots. It flew like a pissed off butterfly
That's too funny
Nice one
Best comment yet.
Float like a pissed off butterfly
Sting like Tibeten Death Wasp
It'd prob still kill you... By accident.
No expert but the fluting on the round + the rifling on the barrel might have ove rspun the round causing the cork screw motion. I'd love to see how true it flies through a smooth bore if you have any more rounds. Thanks again folks and have a good one.
Blue falcon! Every military member knows what a blue falcon is.
Don't be a blue falcon... Just dont
@@imyouridol1605 and even if you know one you still might be one
Unnnnnnnnnnnh! Someone's drill sergeants senses are tingling!
Not just military my dude.
im a civi.
just being in support of armed forces / police makes me aware of the term.
Best Friend ;)
the weirdest part of this video is how it seems to speed up for the breefest moment when it gets going straight and the extra speed seems to throw it back off again. It looked to move just a little bit faster on the high-speed
might just be an illusion though
@@SlumpGod1997 caused by camera angle and projectile path maybe.
It looks like one of them things in my wife's sock drawer it even wiggles the same way.
🤣
i found one in the xwifes draw thought she had been eatting prawn cocktail with it, well thats what it tasted like.
Some are even called bullets...😂
Lmao 🍻
Na bro thats her you dont finish nor please me stick so when your sleeping shes completing all your takin for granted might wanna watch the house for a paco oit the back when you pull in unless your part of it then im sure youd know what the deal was lol
Would have liked to see them with smooth bore. I think the fluting was supposed to impart spin and rifleing is fighting with the fluting.
If you ever run into a kung-fu master who says they can catch bullets, fire one of these at them. They won't know where the hell it's going till the last moment.
lovely! that was one of my thoughts too, hahaha!
i was thinking that they'd be good for combating the robot uprising, for the same reason.
I can’t stop laughing
Merlin Magnus... Kung Fu masters? LOL! Claiming to be able to catch bullets? LMFAO! They KNOW that - ! NO ONE ! - would fire at them and risk murder, attempted murder, or assault with a deadly weapon charges. Challenge ANY of them to mount a firearm and rig it with a remote trigger that they activate themselves! --- AND! Have an independent verify that the weapon functions as designed, is loaded with 3rd party supplied ammunition.... In other words, verify that no gimmicks, rigged equipment, or ammunition is used! LOL! See how many take you up on the challenge. They are con artist and b******* specialists.
That is weird. Unstable stability.
Why not try smooth bore? You have had rounds fail with rifling and do good in smooth bore.
They need to try it through a 50 cal too!
@@Jamal_Tyrone it is the length of a .50 bullet after all
Yeah, I was thinking the aerodynamic fluting might be intended to spin the round the opposite direction of the rifling.
I agree I wonder if the rifling is so much that it is causing the flutes to cut into the air causing it to wagon wheel.
its the corkscrew round. Imagine a full auto burst of them like a swarm of bees
Whit this puppy you can shoot trough a full line of pillars
I wish you guys would have took one shot through a smooth bore just to see if the corkscrew action was from the rifling or from the flutes on the bullet.
aGREEEED
I was just gonna say that
So agree it kinda irritated me they didn't
Ditto
I'd suggest the light weight had a lot more to do with it than the flutes.
This has to be one of the most accurate of the totally unstable rounds you have tested.
right!?
Blue Falcons... because life isn't tough enough already.
@@thepsychosuperman I don't think you get it.
@the Psycho Superman Blue Falcon is the military nickname for a Buddy F**ker (someone who screws over his buddies, not actually f*cks them...except in the Navy 😉)
@@ryanpeck3377 LMAO 😂
WOW. I just realized you have 1.26 MILLION subscribers now! I had no idea how fast this channel was growing. I watch it almost daily but never look at the subscriber count. Last time I checked you had less than 500,000. Congratulations!!! I love your work and look forward to your continued success.
thanks Nick!
Yup, those things flew really weird, thanks so much for testing then!!
"Dzhanibekov Effect" is what you're seeing.
en.m.wikipedia.org/wiki/Tennis_racket_theorem
Wonder what a steel core might do to it.
@@gerythionargarys7848 probably make it weigh more.
@@praisethyjeebus I meant how the projectile flies, wise guy.
The bullet's movement absolutely reminds me about the Dzhanibekov effect. The few moments of stable flight followed by the spinning, with then again stable flight are so reminding of that, even tho it could not be directly related as the bullet has a symmetry that makes it have only two main axes of inertia... So interesting though, it could be something related
That thing has a wild flight pattern! Almost like the Dzhanibekov Effect is at work!
I agree
I was looking for a good way to describe what it's doing, and I first thought of the Dzhanibekov Effect, but that's not quite it. The Dzhanibekov Effect occurs when something that has three distinct moments of inertia is rotating about the "medium" one, and this shape should only have two moments of inertia.
Hello Buffalo! Cool seeing you here! Not gonna lie I had to look that big word up... it does look similar to that, almost like it's trying to change direction or something.
@@fliptheswitch1012 "Almost" = "Not."
I wasn't criticizing them, but continuing discussion. There are no sides to take here, and no need for vitriol.
That sounds pretty technical
The shockwave going across the ground, following the round at 9:31 is pretty impressive.
Just caught the biggest bass of my life. Come home and Jeff has an upload. Life is good.
How big?
@@alextownsend3264 no measurement just pics. All I was concerned with was getting it back fast and alive. It was 4lb for sure. Possibly 5. Wish I could post pics here lol.
America!!!!
Yess. 'murica!
I also launched lead off the back porch before going. Just some air projectiles today. Can't really afford spare ammo atm.
Was it an 8-String or even 12-String? Who threw it?
7:55 I wonder if that glow on impact is triboluminescence? Looks cool. Very bright.
As an old ER nurse, I’d be concerned we couldn’t find the pieces on X-ray. Scary!!
Good thinking. Non-metallic fragments were outlawed by the Geneva convention for this exact reason.
Yep. I once stepped on a mustard jar. It wasn´t funny, the part where the surgeon poked around in my foot to find the shard....
Interesting design, he should try to move the spiral grooves to the rear of the projectile creating a lil drag and making the front smooth. Then add a bit of weight to the front, perhaps throw a few BB pellets in there, that could stabilize the blue falcon.
I wonder how it would fly out of the smooth bore
Was just about to ask that myself.
probably much straighter. the spin from the rifling could be a different speed than the spin from the fluted nose, giving it a weird tail spin
I was thinking the same thing!
Straighter flightpath but tumbling like crazy
@@Seelenschmiede Maybe, or maybe the fluting on the front would stabilize it. I doubt it, but it was disappointing they couldn't try it.
I would like to see a smooth bore test.
HARDWARE STORE CHALLENGE: Greg, OG, and Danny go to the local hardware store and see who can build the best flying slugs. using only items found in the hardware store each man builds 6 identical slugs and test them head to head against the competitors. BONUS POINTS AWARDED FOR CRAZY SHIT,...I.E: fin deployment, discarding sabot, liquid core, pedals, etc.
I'd put my money on jb weld haha
@@JB-Was-Here cast around a bolt.
Excellent idea
I’d just walk casually over to the ammo counter, lean seductively across it, and pull out my cash while winking at the clerk. I’d smile coyly while he bagged up a box of 1ounce slugs, then I’d stroll out the door having won the competition without even trying.
@@OGsDangerShow zero points awarded for creativity
I’d imagine most of the problems with the spiraling come from the lack of weight that might keep it more stable
In particular, it probably lacks the rotational inertia needed at that spin rate.
They could also have a poor center of gravity. If the plastic is dense in the wrong place it could very well be trying to rotate around that and causing the odd corkscrew effect.
I wonder how they would have flown if the "spirals" had been at the rear
I think them using a rifled shotgun might have added to the issue
This is where supersonic aerodynamics come into play and you would need to design for a specific velocity range. Shock drag is created when the air is being compressed at supersonic speeds. Viscous drag is created by the flow of air over surfaces and, critically, in what is called boundary layer separation (which is why the boat tail on bullets is used and improves stability) - basically when the object moving through the air tries to pull a vacuum as it moves faster than the static air pressure can force air to cling to the surface.
For any given velocity, there is an angle optimized to reduce shock drag, and when taken as a function of diameter, a conic section which prevents flow separation at a given static pressure (altitude).
This is why forward-swept wings exist on some aircraft - the sweep of the wings applies to both the reduction of shock drag and viscous drag.
So if you had a projectile which went fast enough and was short enough, the shock cone would close behind the tail of the bullet. This thing is probably approaching that, at least at muzzle velocity.
But, yes, generally, the stability would be better with these flutes at the tail end. Or just along the rear of the body and into a short "boat tail", as a full sweep into a tail would be a waste of space and material for negligible gains.
@@Aim54Delta wasn't there only one aircraft with foreward swept wings, and it was super maneuverable to the point of being unstable?
@@ahalfsesameseedbun7472
There were a few. The Germans tried one which the wings ripped off of, if memory serves. The X-29 was an American tech demonstrator, which is extremely maneuverable.
th-cam.com/video/v-8MVnPHzio/w-d-xo.html
The Russians also built the SU-47, which to my understanding is mostly a tech demonstrator and not a production aircraft.
@@ahalfsesameseedbun7472 the Sukhoi Su-47 Berkut.
I love this channel!
Amazing the velocity and power of some of these experimental rounds!
Its movement reminds me of the Dzhanibekov effect, but it is trying to stabilize like a rocket at the same time.
Exactly my thought, I posted a reply mentioning that and discovered later the you had already mentioned that, KUDOS.
That is exactly what it is
3:59
That projectile performed one of the best evasive maneuvers known to mankind and still found it's way to the target? Mad props
No TH-cam notification for me, I just happened to look and found it
Same
I never get notified of this, or demo ranch, or Kentucky ballistics, or anything vaguely conservative. TH-cam is dogshit.
I ONLY use my subscriptions page, and it's always there. I don't let google tell me what to watch.
@taofledermaus thank you for finally putting the Mach Numbers on the screen so is perfectly normal people know the real speed of the projectiles!
Would have been good to see a shot out of a smooth bore, that might have surprised us also just as the greater distance did.
Some seriously weird intermediate-axis stability stuff going on there. Interesting physics, look up "space station t-handle"
This! I knew I'd seen this kind weird unstably stable spinning before, alternating between spinning and tumbling, but I couldn't remember where. It's not exactly the same, but it's close enough that it probably shares some physics.
The secret to it's accuracy is that the corkscrewing action is actually oscillating, so it never deviates too far from it's trajectory
The spin imparts the stability, but the relative accuracy is because the tail end of it is bouncing off the edges of its own shock cone.
It corkscrews so ninjas can't block it with their swords.
@@Jrez Or Jedis with their light sabers1
@@markfergerson2145 jedi: our lightsabers can block projectiles.
blue falcon: _C U R V E_
@Gary Daniel It IS tumbling, but in a semi-controlled way. As @Dwayne Etchison pointed out, its tail kept hitting it's own shock cone, thus it stays in it's trajectory. No doubt, has it fallen below mach 1 it'd be tumbling uncontrollably
Beautiful!!! Such a cool looking slug! You guys are awesome!!!
Thanks so much!
7:54 -electroluminescence- *Triboluminescence* thanks @mihan2d.
Isn't this phenomenon called triboluminescence?
@@mihan2d yep. thanks
@@rukiddin0669 Isn't this phenomenon called hit makes pew pew fire shooty blue rock go blink
@@thesaddestdude3575 Close, thats this: th-cam.com/video/erFcYsC6JaY/w-d-xo.html
I believe that the grooves at the nose most likely gave them that "cork screw" flight path. Very amazing that flight path on slowmo that is so weird, you dont see that everyday at the shooting range :D
OG surprised us again with that finger wiggle "that was already there", those jokes work only when they "come out of bushes" at the viewer in my opinion for me at least, since I pretty much know to expect those when ever I see OG in your videos.
Looking like the slug has heard about the Intermediate Axis Theorem. Clever piece of plastic 😜
i thought that too, when they shot doug at 5:59 you can see it flip twice before impact. very cool
@@chasebh89 finding a moment of stability in between each flip also. Perfect example of the IAT. Maybe the rifling is too tight? Seemed like it was spinning and thousands of RPM.
YEAH!!!... O.G. back in the house!!
Would be interested in seeing what drilling out that base would do, move the center of gravity forward.
Aaah haaa!! Og’s danger show? I was looking for your channel! Thanks man I’ll see ya there
Thanks for swinging by, Timothy.
I'd like to see these rounds from a full smooth bore barrel.
@9:34 the round corkscrewing but look at the ground...the vacuum behind it unsettles a bunch of dust! pretty cool.
Weird. The oscillations of the slug vaguely remind me of the oscillations of an arrow in flight.
Thank you for the funny riff on "We need a few select people to unsubscribe." - thanks for the laughs and chuckles, I needed them today.
Just going to bed when suddenly.. Suprise Aerodynamics!
Great to actually see the massaccelerator. Shooting is great! 👍 Thanks for all the existing videos.
Please tell me there exists another design called Dyno-mutt!!
side effects of getting hit with this slug:
1: your sgt finding out you weren't really at dental
2: having staff duty over a 4 day weekend
3: getting stuck on chute shakeout
I wonder if the blue falcon means the same as when I was in the Navy.
Probably not for this video
wer,nt that a gimble.
Does it involve buddies done wrong?
What is blue falcon?
yahwehsonren a blue falcon is military slang for a buddy f@cker. Generally means someone did something that ended up screwing someone over or tossing someone under the bus. You DONT want to be a blue falcon. They usually get the full metal jacket treatment.
Q@!: rifling vs the spiral groove at the nose of the projectile both in same twist direction?
they are, but at different rates. I need to adjust that
I would be interested to see the spiralled flutes going both in the direction of the rifling as well as opposing it.
Also potentially smooth bore and different powder loads
just add a steel core, the weight should keep it from tumbling by spreading the mass out more.
It seems as though the weight of these rounds have more to do with the flight than anything else.
Looks like there is not enough spin to be spin stable (rifled barrel).. so they begin to lose form, beginning to tumble. But the weight of the projectile seems insufficient to overcome the increased aero drag of tumbling, forcing the projectile back towards a spin "stable" condition, where the issue repeats..
Reminded me of the Dzanibekov effect in flight...
I think they'd tumble if they were heavier.
The way these spin reminds me of the motion of spinning T-handles in micro gravity
This is exactly what it’s doing!
I feel like those would work great if a bearing or a small dollop of lead was encased in the resin to give it some mass. That would probably reduce or eliminate the corkscrew effect.
I thought when the projectile has rifling you shoot it through a cylinder bore
Still watching, but I gotta say, I was already grinning as I clicked the notification: on my screen the thumbnail looked like you were holding a blue tampon.... X'D poofff =D X"D
Thanks for uploading great content, as always! It's a good sign because it means that covid hasn't gotten you down. Stay safe and dry, just like your humor! ^^
That's a very interesting resin to try other shapes or combinations with...
__disclaimer__
semi-pseudoscientific mumbo jumbo below. Read at your own risk. General frequency theories applied to a ballistic object under fluidomechanical influence without peer review. For entertainment purposes only.
__--__
The corkscrew motion looks to be regular, which could indicate a combination of 2 different frequencies... (the motion is in fact a lissajous figure) which makes sense: the spin from the fluting and the spin from the rifling.
You say the round stays stable first, which makes sense too because supersonic there's no aerial impact on the fluting and only the rifle spin works on the round. Because the round is so light, it probably decelerates quickly, and once subsonic, the fluting starts fighting the rifle spin. That's what causes the corkscrew motion. As it gets more air pressure on the fluting, the rifle spin may eventually disappear altogether as the flute spin gains more strength. (and funny enough, this would indeed make the spin more stable at longer distance, but by then the speed is so low that the motion will still not stabilize anyway. And this is what you saw with the rifle choke: less rifle spin so it wore off faster against the increasing strength of the flute spin, showing a straight but unstable flight at the end without corkscrewing)
I think the concept of this round could be improved if the rifling, the fluting and the speed could be in sync. I'm supposing there are not much options in changing the rifling, so the other 2 must be made to match. The rotation speed of the fluting spin at the speed of sound (which is when it kick in) should match the rotation speed given by the rifling.The latter depends on the speed in the barrel...
"That's a lot of math"...
Lmao... in the army, ‘blue falcon’ has a whole different meaning.
It's a shame PCism has turned it into Blue Falcon. Back in my day... (chuckles in Cold War)
Great.... OG is back behind the trigger. Make TAOFLEDERMAUS great again😁
A smooth bore would have been worth a shot or two
Thanks for watching, Spam. 😎👍
Hey, rounds do accelerate after leaving the barrel..... as long as you're shooting a gyro-jet round
also if you're in a vacuum and shooting towards a planet they will also accelerate, gravitationally
So nice to see how the spin of the rifling and the spin caused by the fluting interfered to create this helix drift. ^^
If the projectile had been shot through a smooth barrel it probably would have tumbled all the way as it did with the choke. If the rifle twist had matched the angle of the flutes the little guy would probably flown off everywhere because both spins would have resonated and amplified each other ad infinitum.
You know? I'd wanna try it out of smooth bore.
there are 2 frames in the video where you can see it lighting up like a lighbulb upon impacting onto the lead plate (7:55 the 2 frames right before it explodes into a bazillion pieces)
F=m*a, 11,500 psi times 0.41 bore area = 4715 pounds force or 21000 Newton. 21000N/0.0091kg projectile /9.81m/s2 gravity = 235,000G's of acceleration!!!
That's not what I get. V0 = 0 ft/sec V1=2000 ft/sec. Barrel is ~ 2ft. Average speed is 1000 ft/sec. Time in barrel is 2/1000 = 0.002 sec. A = (V1 - V0)/t = 2000ft/sec / 0.002 sec = 1,000,000 ft/sec^2. 1 g = 32.2 ft/sec^2 1,000,000/32.2 = 31,000 G
@@SquireJethro Yeah that would be the average acceleration. But acceleration/pressure in the last half of the barrel is minimal compared to the first few inches at full chamber pressure. My math is for the peak G force at the first couple of inches of acceleration.
@@Phoenix88. Got it. Makes sense!
@@Phoenix88. Yes!
Colonel Hathcock did extensive tests chopping down barrels to see the effect.
Down to about 6", a 12 ga. doesn't lose as much velocity percentage-wise as it does in barrel length.
1/2 the barrel length leaves 90% the velocity.
That puts most/all the acceleration in the first few inches.
Same with pistols; most of the delta-v is in the first two inches.
yeah.... thats what i got too..........
The only round I know of that was commercially available that continued accelerating after leaving the muzzle is the gyrojet round.
Weaponized portapotty water!
Holy Crystal Cracking Piezo Electric Light Batman! at 7:55 there's a frame where you can see the Piezo effect cause a flash in the projectile when it impacts the lead plate - Destin at Smarter everyday would dig that! Probably Steve Mould Too. Those have a crazy oscillation in their flight paths. Great Video Gentlemen as usual! : D
thanks!
Hey Jeff. These kind of remind me of how RPGs fly.
Good to see you guys are still kicking out there. I subbed to my boy officer Greg. Thank you guys. I don't always comment but I'm always watching. Much love, from your friend in Hawaii, Thomas.
P.S. yo Greg, I'm still waiting for your happy ass to float on down here. Holler when you any of you guys finally make it to the big island. 🤙🏾🤙🏾🤙🏾🦆🔥
Great show. Interesting. Tell Danny Hi. Bring back Breanna.
NNNNOOOOO, get Danny back soon please no more snorty slappers with the ugly attention seeking sister of hers
👋🏼
I can only conclude that this effect is similar to the zero G t-handle effect. This is where an object suddenly changes direction while quickly rotating. In this case, it appears that air resistance/pressure exerted prevents that change in direction, and instead, physically, deflects it. Thus the back and forth "jumps". This is an extremely interesting video. I think people should take note of these implications.
Blue Falcons: never quite where they need to be
It looks like it needs more friction against the sabot. The rifling is spinning the sabot, but it's losing grip on the projectile and spinning around it
I'm surprised it actually made it downrange in one piece... I presume it's photopolymer resin for an MSLA printer. Stuff's brittle af.
Looks like Siraya Tech Blu, seen a silencer printed out of this before. Not bad resin tbh.
@@LoremIpsum1970 You think? Heh, I've got a bottle of Blu and a bottle of Tenacious in my Amazon cart that I keep meaning to buy... 🤣
@@Bakamoichigei I've seen people print functioning AR lowers out of the combination of those two.
@@mattelder1971 Now THAT is interesting... I mean, I knew the combination could make parts that don't break just because you look at them wrong...but I didn't imagine it was to _that_ extent. 🤔
@@Bakamoichigei To be fair, they used a lower model that I designed specifically to survive being used when printed in PLA, so anything stronger than that will work nicely. But yeah, there are at least a couple out there that have been made with that combination of resins.
Lateral shear forces changed the perfect spin stabilization into high speed wobble. Its fluted epoxy through wildly different rifling.
Maybe Gyrojets accelerate after leaving the barrel, how on earth could a solid mass increase in speed AFTER it stops receiving energy? Facepalm.
Same way a baseball keeps accelerating (in this instance I'm referring to 90+ mph pitches) after a pitcher has released it?
@@TimothySielbeck i think that has to do with the angle that the speed is measured at. If it isnt measured directly in line with its path itll appear to increase in speed as the angle decreases, similar to how a car will appear to decrease in speed as it approaches and you begin to measure the speed more and more from the side.
@@TimothySielbeck from a physics perspective that is not what happens.
@@TimothySielbeck Yeah it accelerates, just In the opposite direction.
The slow-mo never ceases to amaze me how projectiles end up flying in practice vs theory. All the stuff you would think seems really aerodynamic always ends up doing some crazy erratic stuff. And then the funky shaped weirdo stuff ends up flying straighter than an arrow. It's incredible what happens at super sonic/sub sonic speeds.
Lol, yeah, it's often surprising to see what works and what doesn't
Wow, Breanne has put on a few pounds
Hysterical
At 9:22 and the slow-mo after...is that a shockwave visible in the dirt?
You know it's a cop shooting when they hit everything around but not the target. hhhheeeeyyyyoooooo
Imperial Storm Trooper perhaps?
Oh man. I used to teach indoor small bore to kids. We used the "police bay" at the local range when it wasn't in use. It was the only bay out of four with holes through the roof. (And it sure as heck wasn't because of the kids)
Thats cold.
@@TheOlsonOutfit
I had to teach a shariff and a state trooper how to sight in a pistol. ..
Sad....
Great Video!! can't wait to see the blue falcon Gen II
"Blue Falcon" so it's designed to accidentally hit your buddy, huh?
Not only is it made from resin, it's also 3D printed! You can see that by the little imperfections at the bottom. That's where the supports were attached to.
I wonder if Michael could fill the mold with some small lead shot and then pour the resin over it? Just to add some weight... Or maybe a tungsten core or something.
Weird how in the hi speed from the rifeled barrel it seems to spin to a tumble then stabilize.
@Taofledermaus just a curiosity? Obviously any lays or lats on the projectiles surface will encounter resistance from hydrodynamics en route to the destination, precise uniform density must be maintained to avoid weight shift, and a variance I’m not certain anyone questioned... are the lats and lays on the round, rifled the same direction as the rifle’s bore? If the projectile is cut counter directional to the bore rifling it may cause the anomalies in its trajectory.
thanks for including the mach speed
At exactly 7:55 there's that flash - it's always with the lead plate. @Taofledermaus, you should do a video trying to capture this phenomenon and let's see if we have any plasma physicists who can weigh in. It's really intriguing - on top of all the other cool stuff you're doing!
That trajectory of the round is hilarious
Wow!
Never seen a projectile cavitate like that through the air. I wonder if moving the center of gravity forward or backward would make a difference. It almost looks like it wants to tumble but recover at the same time.
The spiral cuts on the round suggest subsonic stability. Supersonic causes the spiral cuts on the tip to catch just enough air to throw out the center of mass, but because the cuts are symmetric, they create a defined & mostly predictable corkscrew flight pattern.
The way that round wobbled, reminded me of a top spinning slow and about to fall over, maybe not enough spin?
Looks like the dzhanibekov effect out of the rifled barrel. That’s pretty cool.
Next projectile for the testing should be a corkscrew. Or maybe a piece of some heavy duty spring that's right caliber for the 12g.
Just joined OG's channel.. I can't understand how I haven't got around to it.. Been working too much I guess.. But now I have OG-videos to entertain myself with and some beer and pork chops!
The shockwave across the ground at 9:36 👌🏼😏
The corkscrewing looks a lot like intermediate axis tumbling (Dzhanibekov effect) getting corrected by aerodynamic forces. This suggests that the rounds are not of rotationally symmetric mass distribution, but it might also just be that the material is much too light to be stable under the asymmetric aerodynamic forces introduced by the fluting and other imperfections. I think the rapid dissipation of its angular momentum (light mass vs drag) might also lead to the tumbling force as even rigid rotationally symmetric bodies tumble on their major axis (the lowest energy state) if there's a mechanism dissipating angular momentum.