Supersonic ping pong balls...vacuum and compression cannon combination. PART TWO
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- เผยแพร่เมื่อ 16 ก.ย. 2024
- If supersonic ping pong balls can't do enough damage alone, filling the balls with water first and then firing them will give them a bit more destructive punch. Ideally a vacuum cannon can expel a ping pong ball to exit velocities somewhere between 400-600 miles an hour, impressive by itself but adding a compressed air behind it and the ball can go supersonic. My combination appears to top out around 900 miles an hour, while several other more advanced models can reach 1200 mph, there is even one claiming to top 1700 mph.
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I'm graduating in theoretical physics but still amazed by your videos! The oscillating air flow was so beautiful! Nature is amazing 😄
thank you, after teaching for 41 year I am still amazed by the nature around us, it never gets old
@Likith Magnet as a kind of parametric ozcillation?
@Likith Magnet
Yes, I would be surprised if it was a bifurcation system 😲😄 in fact it reminds me of Kundt's tube, as if the shockwave was reflected at both sides of the canon and amortized through time (due to a non-zero transmission coefficient). Maybe we should look what happen on the other side to test the hypothesis 😊
(sorry for the possible mistakes in my comment, I'm French, with all the non-English-speaking it implies 😂)
@Likith Magnet but a threshold velocity here would be a so beautiful behavior! 😲
Yes! It reminded me of a pulsejet
This cannon needs Slow Mo Guys with their ultra fast camera.
Already happened, look for the malteasers episode
I would love to get those guys to visit here sometime
YES, “ Science in slow Mo”
A bit of an investment but you can get a really good high speed cam for about $3k. The Chronos made by tesla500 (his TH-cam name). Beats the $120k for other units capable of similar speeds.
trustthewater PLEASE DON’T FORGET.....He’s a High School Teacher.... good mind good heart not a lot of income
You should try adding a converging-diverging nozzle to increase the airspeed
I have a couple ideas on that, I would like to try including one that would spin the ball like a gun barrel
I have been waiting three years for an update on this @@YeanyScience
Very interesting video and really didn't expect that pendulum movement.
Also adding the water was a good idea and cool to see the immense effect even so little mass can have.
It's 5am I haven't slept in 36 hours and I can't stop watching these videos. Im not sure if I should be mad at you or thank you. All these videos are way too cool thank you sir
How about firing it at the most obvious thing ever... A ping pong paddle...
Already been done believe it or not th-cam.com/video/bAKqzAzfXKQ/w-d-xo.html
@@jvcrules maybe so. But most of the things this guy does have been done somewhere else on camera before. I just enjoy watching him do it. He's a charismatic and wholesome teacher.
Awesome. You take this so much further than the other ones I have seen so far :)
One of your best video for sure
the pineapple cleavage was quite satisfying after being blasted by the water filled ping pong ball. Cleavage refering to the way it fractured/broke apart. I'm curious to see how a supersonic marshmellow would compare to the ping-pong ball.
LOL, thanks Michael, that is a great idea, I'll have to try that
@@YeanyScience isn't a marshmellow closed cell?... In a vacuum ? ... Could be messy :) otoh the pressure collapsing the degassed marshmellow at one end partial vacuum expanding it at the other might be pretty cool.
This is an interesting demonstration of water hammer, just with a less dense liquid. Thank you Mr Yeany!
7:43 Do you want ants!? Cause that's how you got ants!
Ants are the dominant form of life on planet Earth. You already have ants.
I like ants
In future it may be a good idea to have a backdrop to make sure a misfire can't hit a vulnerable target on accident.
you are right, I put a dent in my drywall due to missing my target, two things for the future, one is to wrap the PVC air tank to make it safer, and do everything outside
Just fantastic!
It would be interesting if it was fired vertically. The height might give an indication of the energy of the pong.
I've fired a few water filled balls vertically it is impressive, I could try timing them when I can get some.more, also I'm thinking I may want to try a ballistic pendulum
In think it would give an indication, but the effects of air drag would be such that I think it would be quite hard to infer the muzzle velocity directly without ballistic simulation of the whole trajectory, which would be even harder if trans-sonic. The better plan I think is that if we all watch more of Bruce's videos, he'll be able to get a really snazzy high-speed camera! 🙂
This reminds me how much pressure there is in a cylinder of Turbo-Diesel engine.
Ants must love you! Great video.
they do seem to thrive around here
This could be the new hydraulic press channel
You should add a convergent-divergent nozzle after the pressure chamber to accelerate the air even more. This will also provide a learning opportunity of fluid dynamics in the design of the nozzle. In my cannon I added a burst disc just between the nozzle and pressure chamber which is set to break at 100 psi. This creates an automatic 'trigger' from an air compressor just exceeding the 100 psi limit when pressurizing the chamber. You will easily exceed Mach 1+ with this addition.
A low-mass object traveling at an extremely high velocity can have the same impact as a high-mass object moving at a low velocity. It's why a piece of space debris the size of a grain of sand can punch a hole through a space suit. God I love physics.
Very cool. Great video Sir.
That's impressive my friend. I feel honored to be the 1000th like. You deserve 999,000 more.
nighthawkinlight has a great video on vacuum cannons and he uses a plastic cup as the seal at the end of the barrel so the air/ball don't have to break the seal. It'd be awesome to see your set up run like that
I didn't see it but will check it out
Excellent video. Just be careful with the PVC as it supposedly fractures and splinters very badly, or at least that's the reason it should not be used for high pressure situations such as this. You could wrap it in duct tape to offer some protection should this happen.
Thanks Dan, I will do that for the future
Thanks for another great video!
The speed at which the trigger valve can opened by hand strikes me as possibly a speed-limiting factor. Did the projectile ever experience the maximum cylinder pressure, or had it left the barrel by the time the valve was fully open? Could you put a very fast-reacting pressure gauge part-way up the barrel to see the maximum pressure that was reached? If it vents before the valve is fully open, you'll need a faster way of twisting the tap.
I’d be interested to hear how loud the cannon is with the ping pong ball breaking sound barrier
my favourite thing you do with the slo mo cam is you show the real time video first so we can get some idea of what the explosion looked like in our time frame then you slow it down so we can see the details. Other slo mo channels dont always show the real time video, only the slowed down version
thanks L Wolf, I agree with you on that, not just in this video but I love to see the behavior in slow motion but always want to know what the event looks like in real time
@@YeanyScience exactly! How can we appreciate the slo mo tech if we have no idea how quick the things are happening in real time. You need that juxtaposition
This is an awesome video it answered a lot of questions I had about my own cannon
Is my math right, in that the water-filled ball has about 20% more energy than a normal ball?
It's heavier and slower, but still more efficient at transferring the air pressure into motion?
I'm theorizing here however I speculate...
acceleration is difficult since the amount of energy required and energy efficiency is quite high and low respectively. aerodynamics and the air resistance as well as displacement of the air inside the pingpong ball is quite difficult considering a ping-pong ball might not be that well sealed. With the density of water it takes a lot of energy to displace, but water clings together due to the strong hydrogen bonds plus the sealing walls of the ping pong ball. acceleration from low to higher speeds is more efficient than accelerating from high speeds to even higher ones and I think somewhere around mach 1 that curve isn't efficient for energy transfer. Therefore water displacement energy is more efficient due to the speed it reached compared to the faster and less dense air filled ping pong ball.
If you are talking about kinetic energy, then no. KE=1/2mv^2 . Mass for normal ball m = 5*10^(-3) kg and v= 384m/s so has a KE = 368.6 Joules . The water filled ball has a mass of m = 30 * 10^(-3) kg and a velocity v = 76.8 m/s , so has a KE = 88.5 Joules. Therefore, the water ball has 88.5/368.6 = 0.24 = 24% the KE of the empty ball. Or roughly speaking, the empty/normal ball has roughly 4 times the KE of the water ball.
My mistake here. I gave the velocity of the empty ball fired from the combination of both cannons, and I gave the velocity of the water filled ball but that was taken from the water ball in just the vacuum cannon alone. I need to go back and measure the velocity of the water ball fired by the combination of both cannons, I was running low on ping pong balls and didn't get to it. I am very interested to see what that is
@@c.james1 It would be interesting how the weight of the balls effect their inertia. The lighter ball has greater energy however how long after leaving the barrel does it keep that energy compared to the weighted ball.
@@TheCoomer Indeed, the KE calculated is as you point out the KE at exiting tube. I don't know, but I would assume the empty ball would lose that KE faster than the water filled ball.
Very instructive! I love watching your video.
Thank you!
You could also make a stronger compression cannon. Using steel schedule 80 and pcp hand pump. Could bump it to 3000 psi easily. Obviously need more safety.
Greetings from Argentina! I have recently found your channel, and I must say I would have loved to have had you as a science teacher. Great work! As for a suggestion, since you already loaded this cannon with various projectile weights, can you use it to give examples on the relationship and differences between an objects kinetic energy and its momentum?
Great to hear from Argentina, I hope to update information on the cannon and am waiting to borrow better equipment for making more precise measurements
I certainly not going to pretend to understand your explanation, however, the obvious question to my mind is: what does the ping-pong ball look like after each of these examples? Love your videos.
Did you watch the first video he explains it quite well
thanks Dennis, what else was interesting was the I tried a couple different brands of balls, some made out of more flexible material that would break open and then just flatten like a pancake while a more rigid material would shatter in several fragments.
I always enjoy your videos Bruce! Stay safe!
Thanks, you too!
Hey guys, I'd like a scientific understanding of how/why the pressure directly affects the "fog"
Good point - that would make a great video in itself.
good thing your neighbors don't complain, that is really loud
HI Paulo, it is a lot louder in person, my neighbors are find it all very amusing and have joined me from time to time
how about setting a throat section (50% of area) between the 2 cannons, smooth contraction and expansion. And placing the ping pong ball not in the compressed air cannon, but in the vacuum one, after the contraction. This arrange should create shock waves at the throat and the expansion should further accelerate the now supersonic flow. This could be enough to create supersonic balls only with the vacuum cannon
Hello Felix, good advice, I have been busy with other projects but hope to get back to this piece soon. I'm always looking for suggestions to improve it, thanks
Muchas gracias.
I would love to see a range of weights and resulting speeds so we can calculate energy. Also, What happens if you seal up the tube with a sabot?
I found that a single ply of a plastic grocery bag wrapped around the ball gives an excellent seal, I didn't include as the video was already getting a bit long, if ? when I do another I will show that
Two ideas, the first is suggested here. The second, does a compressible material effect how it hits the object? What about trying foam insulation or whipped cream or soda? How do those react when hit an object? These are materials that compress under pressure.
Bruce! Can you test the speed of the water filled shot with both set ups, and I think it would be cool if you use the kenetic energy formula to see the amount of energy the ball has. This is my favorite video you've made to date :)
And if you do the calculation for each of the speed tests you could compare the resulting calculations
Thanks Ryan, I should have tested the water filled ball at the high velocity. ran out of balls and didn't want to run to the store during this time. I'd like to compare them again with a better camera and get a clearer results visually and for measurements
Bruce Yeany is now the Gallagher of science!
could an electric switch time it just right to break the seal at the end of the vacuum tube so as to eliminate the compression slow down?
I'm not sure, I'm still learning on this and always open to advice
@@YeanyScience Bruce you explore learn and teach. we watch, absorb and admire
Now instead of using compressed air, use a combination of oxy and acetylene then you could prove for sure if anything can travel faster than light.
You do that 1000 time back to back and boom, the large Hadron Collider!
different 3D printed shapes other than a sphere?
ok, you got me, I was thinking of a 3D printed bullet.
good idea my son has a 3D printer, I'll have to get him to make me something
@@YeanyScience what about a ping pong ball cut in half and then glued together, like one of those things used to play diabolo. would it get destroyed in contact with air before hitting a target?
which one would travel faster, a standard cylinder or one with concave bases?
We really need to get some SlowMoGuys over here.
Very interesting topic, If I am not mistaken the effect you demonstrated of the barrel "sucking" the escaping gases back in is one of the reasons that main battle tanks have bore evaluators ( that bulge on the barrel of the tanks cannon) fitted, it prevents noxious combustion gasses entering the crew compartment between shots.
Thanks Andrew, I didn't know that, taking it a bit further, I should have compared it to a previous video the I made on tennis ball cannons where I made the barrel a bit too long, in a few of the shots the ball never makes it out of the barrel, it comes to the end and then atmospheric pressure pushes it back in again,
@@YeanyScience Here is a video showing the other concept your experiment reminded me of....
th-cam.com/video/JdOXYDZO2so/w-d-xo.html
Perhaps an idea for a follow up to see how fast you can get a ping pong ball going. :)
thanks for the link Andrew, interesting concept, I definitely want to learn more on this one
Bruce. Fab vid but I'd like you to test your air oscillation. I think it is more likely to be the resonance of the plastic chamber. Test it by changing the mass of the chamber by adding something to it, building a different sized chamber of plastic, or even better, build a metal chamber. I'll lend you my metal one but youll have to come to New Zealand...
If you can change the oscillation, it can't be the air (assuming no temperature or pressure changes...both likely to be negligible).
Hi Joe, I had someone else also ask that also, while I'd love to come to New Zealand, I do have a larger chamber and some metal pipe here that I can easily test. I'll give it a try
I watched the explosion, clicked like and carried on watching. As for ideas or theories, I don't know whether pure compressed gases would make any difference and if they did, choosing the most compressible gas.
My only other idea would be to try and stop or reduce the equalising pressure spring effect, if it is affecting the speed the cannon can fire at. That would be to have two tanks at the rear (with two different sizes or pressures) with a one way valve on the first tank (call that TANK ONE) and feed that onto a one way valve then onto the next pressurised tank (TANK TWO) and onto the barrels.
So it's TANK ONE (higher pressure) --> One way valve --> TANK TWO (slightly lower pressure) --> launch valve --> barrel --> next vacuum barrel --> and out of the cannon muzzle.
Open TANK TWO first and then TANK ONE quickly and out of sync somehow and boom and hopefully positive pressure for longer to increase velocity at the end of the barrel.
I don't know whether my late night gibberish thinking has helped or not but this video has been interesting, entertaining and destructively good!!
I think I got that but it sounds like it may be a bit beyond my capabilities
@@YeanyScience - I had thought it was a bit overblown too, and laughed about it, but considered it a viable option when I looked at means and ways of reducing the negative pressure introduced by the vacuum segment of the cannon. A possible easier option would be to experiment with larger pressure tanks and different barrel lengths for the vacuum barrel.
I also considered a theory for an accurate method of distance measurement, but only over longer distances, and that would be with sound.
A microphone at the muzzle (into the left channel of a stereo recorder) and another microphone a target (mic'd and into the right channel) and compare the muzzle and target millisecond sound difference looking at the files on a computer. If it worked, you could try 5, 10 , 15, 20m distances a few times and compare to get a median measurement.
Love to see the effect of longer and shorter pipe for the vacuum canon, with the obvious question of where does length no longer accelerate the object.
I would too. I have several lengths of pipe and would like to see it but really need a faster camera or other means for measuring the velocity more accurately
That. Is. AWESOME! I do have a question regarding the hook up between the compressed air cannon to the vacuum cannon. When hooking them up, does the compressed air cannon still have its barrel? If so, wouldn't the barrel, holding normal atmospheric air pressure, hinder the travel of the ball? What type of effect would it have, if the barrel of the compressed air cannon was shortened to the diameter of the ball? I'm curious if the compressed traveled almost immediately into a vacuum, without first traveling through through normal atmospheric pressure air, would have an effect on the ball's speed. Thank you for sharing this information! When we return back to school, my physics students are going to LOVE this! :)
Hi Dwight, At the moment when I combine them there is no length of barrel for the compressed air section, I hadn't't even considered it but now that you mention it I'm curious also. I'll see what I can do, if your physics students have any questions or advice, I'm also happy to hear them. I've had other science classes correspond with me at bgoknee@comcast.net
Bruce, what size Ping Pong balls are you using, are you using a 38mm or 40mm? Thank You.
With the ball accelerating after breaking the Mylar you should put tubing after the Mylar to help with acceleration.
I had a drink.. but I'm sitting here imagining the physics version of breaking bad :D
That sounds Great
How about using a potato gun vacuum cannon combo? Place the Mylar barriers at both ends of the vacuum barrel. Then couple the barrel of the potato gun to the vacuum cannon barrel. I think you would get higher velocity just due to not needing to twist open the valve on a pressure cannon. Plus I would think you could get a velocity boost from the combustion of the fuel in a potato gun. I don’t have a place to try this myself or I would try it.
This reminds me of Destin from smarter every day when him and his friends made a sonic air cannon that shoots baseballs
Where is your video to build a combined one, please?
At the end of the pipe, you should put a 5 liter vacuum reservoir, to remove any air that makes it past the ball.
as with most of my videos I had some fun making this one and intend to do some more experimenting with it, I'll be looking at your idea when I can get more supplies
Your vids are great! Can you show a light experiment why stars are not visible in space but at earth ground level?. even high altitude balloons do not show stars. thanks!
Will a golf ball fit? How does the momentum compare between empty ping pong, water ping pong, and golf ball? Do their respective measured velocities match the calculated when using the same force of air?
How about firing it into an accellerator ring? See if you can preserve the energy for as long as possible. With the right curved drainpipe type ring it should be possible. If a little tricky. From Ryan in England.... 😎
Could you make two identical versions of this setup, then fire them at each-other and see what happens in the middle?
I had this thought too. Might be a way to compare slightly different variables in the differing setups.
that would be awesome but the timing would be not possible by hand, electric valves might work
@@YeanyScience yeah, I imagine you would need a solenoid of some kind. I suppose maybe you could setup some kind of string that when pulled from the perfect spot would open both valves at once, but probably would be less reliable.
Wow! Best video in my 2020
Is the schedule 40 PVC pipe especially 3" safe for you to pressurize it to over 110 psi? Will schedule 80 pvc be more safer?
The 30 g ball is 6x heavier. So 859/6 is 143 mph.
The heavier ball made 172 mph. That’s a big improvement in efficiency.
I’m impressed with vacuum cannons and ping pong ball.
my results are incomplete, 172 mph is just the vacuum cannon alone, I expect the combination of the two cannons should give me a much higher speed, I ran low on ping pong balls and didn't measure this. Did not think it right to go to store in the middle of the current problems to buy more but will when thens get a bit more normal
Bruce Yeany
Include ping pong balls in your next Amazon.
There might even be a run ping pong gear for the at home entertainment.
Braking Bad
or
DARPA
I’m glad he’s on our side 👍🏽✌🏽
Maybe add a muzzle brake to better dissipate the exit gases and maybe reduce that oscillation
Very impressive! I'm wondering if this works with a golf ball.
Haha. At 7:28 you can see a bird get startled by the cannon firing and it takes off in slow motion.
What if you put a one way valve or flap at the beginning of the barrel. To allow air in but none can escape. The ball would go faster with no backpressure.
You don't need a long section before the vacuum. You need a larger pressure reservoir.
What about use of sliding magnet inside of tube, that compress air on one side and decompress on other, when electro magnet which drive it in charge.
My suggestion my friend Bruce, is that you assemble a team to create a battle robot using this weapon and participate in the TV competition (Battle bot) hehehe
My friend, that sounds like a great idea, has anyone ever used a cannon for battle bots? not that I've seen
@@YeanyScience
I don't think anyone used a cannon in battle, the only one I saw using something like that was a robot with a flamethrower.
See how these battles work my friend Bruce:
th-cam.com/video/Q7mahD-PH4o/w-d-xo.html
I believe that if you made a team that assembled a robot using your cannon, you would win many battles! : D
It's raining watermelons!!Outstanding!!
that was a lot more than I had expected, I'm glad I did that outside
Yah do it again!!!
Amazing!!!
NASA needs you on staff.
So I was wondering... Could the addition of a longer barrel alone increase the power of the round? It's something we see in guns all the time. Longer barreled weapons with better accuracy, more power, more ability to punch through things. How much difference does the vacuum make vs just adding the extra length to the barrel? Now granted, guns have rifled barrels and conical bullets that spin, so this would be more akin to a musket vs a flintlock than sniper rifle vs pistol, but the idea seems sound. Would love to hear the explanation behind it.
Maybe ending the vacuum canon with a bigger diameter volume so the ball isn't decelerated by the air before it. It would lower the pressure build up before the ball because of the bigger portion of vacuum vessel in front of it. The ball air in front of the ball could move to the sides in the last portion of the vacuum vessel.
that is a good idea and it brings up I had another question in my mind about which would be more effective, have the air in front of the ball break the seal or having the ball itself break the seal, in either event there must be quite a loss due to the strength of the mylar. seems like there should be another alternative
@@YeanyScience breaking it directly with the ball maybe have the problem of damaging the ball at the impact. Something pointy should be more energy efficent to burst the mylar. Highest velocity possivle on target I guess would be with a target in vacuum, but would need a big vessel.
Man, I love physics but sometimes it's just flat out cool watching a watermelon explode
Epic experiment!! I know what I'm doing next with my spud gun!! You should try using a golf ball with some cloth or paper town as a wadding around it to give it a much better gas seal in the barrel. Also I would recommend using a sprinkler valve to release the air from the pressure chamber. It'll open way faster than you can turn the ball valve. Also I would recommend modifying the sprinkler valve to use an air blow gun valve instead of the included solenoid-actuated valve that comes with the sprinkler valve.
thanks Danial, a golf ball doesn't fit in this size barrel, perhaps the next size larger? one layer thickness of a grocery bag makes a great seal but I didn't really test it as I already had too much to present on this video. I like the idea of the sprinkler valve, I will look for one
@@YeanyScience For my spud gun, I used 2" PVC pipe. Golf balls are definitely too small to fit "just right" in the barrel, so I always use some folded up paper towels to load them, just like a wad is used in a black powder rifle. I have also designed some extremely effective 3D printed gas seals. They allow any kind of oddly shaped object to be fired effectively. A benefit to using a sprinkler valve is that it comes with a threaded connection in and out, so you can interchange the barrels and have all kinds of sizes. I recommend using a sprinkler valve with the largest inlet and outlet size that you can find. In my case, I found one with a 1" diameter. The following video was very helpful for me in modifying the sprinkler valve: th-cam.com/video/dkQYgDz8-KE/w-d-xo.html
A better sealing projectile. I’ve seen a PVC cap with a good sealing O-ring that was quite impressive.
Hi Chaser, wrapping a single layer of a grocery bag around the ball will give an excellent seal, hope to show this in the future
9:55 the biggest watermelon explosion I've ever seen
I do have one more request if this ever gets revisited. I wonder if with the weighted ball whether with the water frozen within the ball would cause better penetration compared to the weighted ball. Perhaps the normal ball releases more energy in one go compared to the frozen ball 🤔.
I like the idea, I know water expands when it freezes so it may not fit. I'm out of ping pong balls but will try it when I can get some
@@YeanyScience Thank you! 👍🏻.
wet the ball in diesel. use the hydrostatic forces to seal the tube, gain efficiency.
2:30 now thats a lot of damage
Could you Perhaps make a larger tube that steps down to the smaller tube for the vacuum tube (quite a mouthful). I wonder if the extra volumn the larger tube would offer for the vacuum area would increase the velocity. So narrow vacuum tube stepping up to a coned funnel to the larger diameter. Then back down to the original tube. Then a short tube would only be needed for the compressed tube.
that's why I love posting videos, I get all sorts of ideas that I hadn't thought of, now if only I had more time to explore them all
@@YeanyScience I have to thank you for all the wonderful experiments you perform. I would love to carry out similar experiments however with work, life funds, and time all hard pushed when are young it Is difficult. However you perform many science/physics test that we all wish to complete, which is fantastic for those of us wanting to learn and experiment.
Thank you.
P.s If you ever to test this again, it would also be interesting how far the weighed pig ball travels compared to the weighted one due to the air resistance (eg shooting straight up, how long before the balls reach the ground perhaps).
I would like to see how one of those "kooshballs" works in this thing. The rubbery, shock-absorbing tendrils should stay intact in the high-pressure section, and be pulled along by their drag, but the vacuum section should not be a hindrance with air drag. Maybe it would go farther than a brittle ping-pong ball, but still be relatively safe if it goes farther than expected.
Great idea, after stores open up again I will have to go shopping
@@YeanyScience ...as one does.
Distance tests would be cool...
I'd like to see that too, I need to find a big enough field
We want to see it hit some kind of solid metal plate. Start from a pan and go higher in strength 💪
Demolition ranch style 👍
Earth Lab had an episode where they shot a pencil through a 2x4 using a CO2 fire extinguisher. I think that your canon could accomplish the same result by putting a sabot around the pencil.
In an earlier video, I used one with a small tube and was shooting pieces of straw through it, they are impressive, I didn't consider using it for this but thanks for the suggestion, I will see if that helps
Robbers in the US hate this projectile.
Nice!
What if you loaded the ball with a bit of cloth to have it seal better, like how you would have a small piece of cloth in between the ball and the powder in a muzzle loader.
one layer of plastic grocery bag makes a really good seal, I haven't had a chance to run more tests on it yet, I get more more ping pong balls when stores are open
Very impressive. But can you make pork chops and applesauce?
Can we have a comparison of the empty ping pong ball and the water filled one from the cannon.
Followed by an explanation why it's different (with formulas). And also an explanation of why the impact is so different. Lower mass, but higher Velocity vs higher mass and lower velocity. Same energy, but different end ballistics nonetheless.
I'd would like to get into that a bit more but didn't due to my limitations with the equipment. I'm not not sure how accurate my measurements are, I really hope to buy or borrow a better camera high speed camera
@@YeanyScience I'm really looking forward to it! Thank you for all the work and effort. These are immensely interesting and educational.
how about a one way valve on the pressurized side to let air in through the back but not out, so that it does not create the spring effect
Does the volume of the pressure vessel vs the gun barrel have any effect on the oscillation? ie. Like tuning a 2 stroke engine exhaust?
I saw the same type of oscillation at much lower air pressures in the air chamber, since it is so fast I don't know if it changes rate or not, I can see that at lower pressures it is not as intense and it doesn't late as long
Would dipping the ball in water or oil help to prevent air from flowing past it inside the tube?
I found wrapping them with a single layer of grocery bag plastic does the trick, but didn't show it due to time constraints. Interesting, the seal is so good that it dramatically moves the ball placement inside the barrel when I turn on the vacuum pump
What happens if you fire this ping pong ball next to a tesla coil energized at many kw, for example 200kw?
Would this little ball be disintegrated by the electric current before doing any damage to the target?
WOW, I have no idea but I like your thinking