Experiments in Magnetically-Delayed Blowback

[@edobeirne]

Nobody ever posts videos of projects that did NOT work, but you can learn so much from failures. Plus this is very entertaining and informative aside from your project. Thanks man, keep 'em coming!

[@von...]

well, people post "free energy machines" all the time - but the distinction of people, who I actually want to hear from, posting their failures is refreshing & actually super engaging for me. it seems like there are a decent few of us with similar interests who are finally getting recommended this channel, so I hope he gets the recognition his effort here deserves.

[@cryhavocandletslipthedogso1873]

@@von... Speaking of free energy machines - my sister's rental hybrid car seemed to her like one. After all, the engine was so quiet (anemic) that at significant speeds, the also rather quiet tires, were actually completely drowning it's sound out and the little hybrid battery was pretty much nearly full all the time, while the digital fuel gauge wasn't going down for well over a 100 kilometers. Turned out that the digital fuel gauge was simply terrible, for it could only display the fuel level in 12,5% steps.

[@workingguy-OU812]

Impressively, this technique does work. Just about six months ago InRange TV featured a gentleman with a 3D printed magnetic-delay 9mm carbine.

[@davefellhoelter1343]

AMEN! As a guy who built and fire up, tested, repaired, or others on about every type of equipment or energy around? FAILURE leads to Great Things! with the right attitude an open mind and Eyes Wide Open! and these idiots Paid me! for thing "I would" have Paid to do!

[@greegor4719]

​@@workingguy-OU812I would like to find out how the successful one overcame the problems in this video. I was guessing that miniaturization would overcome the long travel problem.

[@Treblaine]

One problem I see is that the point of a blowback mechanism is to stop the bolt moving any significant amount in the microseconds the bullet is still in the bore yet for the eddie currents to be created the magnet on the bolt needs to move a significant amount. I think the best use of magnets is as a buffer to more smoothly decelerate a high velocity bolt in a short receiver, as that is the point a bolt will be moving the fastest and needs to be slowed down smoothly.

[@cokdnlokd1238]

Gilles, as a fellow tinkerer and firearm collector/gunsmith I would like to say you never cease to amaze me with the depth of your knowledge about so many things.

[@shoelessbandit1581]

I'm surprised a channel this professional and nice is so small. You need more subscribers lol

[@Zbigniew_Nowak]

A lot of guys who show utter nonsense on the internet have a 100x larger audience. :(

[@MakeOrBreakSociety]

He's finally getting a boost thanks to the today I found out channel! And seems to be gaining momentum!

[@dylanmccallister1888]

There is another channel like, exactly like this which I think this guy is taking too much inspiration from Technology Connections They have 2 million subscribers and are an older channel. Also the host has a great name for the show, Alec WATSON

[@SnakebitSTI]

I've noticed KZbin recommending me this channel's videos for over a week, which I usually take as a sign that the recommendation is legit and not just a weird quirk of KZbin's algorithms. So I started watching, enjoyed the videos I watched, and was shocked to see the subscriber and like counts so low. But the good news is that KZbin does seem to be giving the channel some visibility.

[@kylethenile]

​@@dylanmccallister1888 this is definitely nothing like Technology Connections. TC'S videos are more in the form of a story about the presented technology which is always electric based, mostly home appliances and decorations. This channel does a whole variety of different technologies, both electric and non but mostly non. Also this channels presentation is just straight facts with almost no personal feelings unlike TC. If you honestly believe these two channels are channels are similar to the point of redundancy, you're not thinking critically about what you're watching. Like, at all.

[@ajwilson605]

Did your research and calculations take into effect the expansion of the .22 caliber case when fired. Years ago I had a 10/22 and in trying to "customize" it, I polished the feed ramp, breech, and all the bolt faces. I put a mirror finish on all those surfaces. It was beautiful.....but shooting it revealed that blowback gasses were blown right into the face of the shooter My polishing job had altered the lockup time because the case would expand into the polished surface , it could still propel the case backwards. The case and breech was designed to have the case swell and grip the inside of the breech....and then when the pressure dropped the case would release and the case could push the bolt backwards, cycling the action. It racked my 14 year old brain for about a month until I took the gun to a local gun shop with a gunsmith. He laughed when I told him what I'd done and took me into the back. He disassembled the rifle and took a piece of 800 grit sandpaper, put it on a loose mandrel and ruined my meticulous polish job in the breech. After he got a "satin" finish in the breech he reassembled the rifle and took it over to his test stand. Set it up and loaded a round into the chamber, and put another round into the magazine and put the magazine into the rifle. Using a hook he then pulled the trigger, it went off......but no blowback gasses! Same with the second round.... My rifle was fixed! He explained to me what I'd done and the effect it had on the action.... He charged me a whole dollar for the repair. But the lesson was learned.....

[@briankappel6131]

Dude you sound like one of those dumbass Facebook chat ai things that make up ridiculous stories to trick boomers

[@DSlyde]

My first thought is that you need an accelerator, like in lever delay, that uses leverage to push the block with the magnets faster than the bolt itself moves back. This would let the bolt stay largely in place until the eddy currents could form, and it would be stronger because it could go faster. But at that point you essentially have a lever delay rifle already and im not sure what advantage adding magnets would have.

[@stianberg5645]

I think so too. I was thinking something like a famas action, but then the whole point of simple designs are gone and you may as well just make a famas. I think perhaps magnets could be an interesting way to tune rate of automatic fire though. Another idea is that magnets could make gas operated mechanisms delay at a shorter distance by slowing the impingement (kind of like a free floating piston in between gas vent and bolt). Still not a simpler design, but it could be an alternative for large caliber pistols/pdws.

[@ErikEspangberg]

I also thought of some type of gearing. But I have no idea of any good material for anything moving that fast through many cycles.

[@G0ldbl4e]

The advantage there would be that you wouldn't have as much difficulty cycling it by hand because the magnet's effects are velocity dependent. You could rack it by hand easily but a bullet pushing it backwards quickly would see enormous resistance.

[@Andre_Thomasson]

im here because I was thinking a separate delay mechanism that aso uses eddie currents

[@3darms]

I wonder how much effect there would be if you had a magnet on the bolt and one on the frame that were almost in contact when the bolt is closed and pull towards each other. As the bolt moves rearward it would provide some amount of resistance to the initial opening but would drop off quickly as the distance between them increased.

[@ivankrylov6270]

I had the same idea with opposing magnets slightly offset to push the bolt in the closed position

[@Preyhawk81]

the magnet will induce an counter current in the metal alloys i think it will delay it enough.

[@alecubudulecu]

This was actually how one of the recent 3D printing firearm competitors achieved this. I don’t know the name but it’s pretty easy to find on KZbin. He created a 3d printed pistol reinforced with magnet parts and can attach and detach magnets to change the recoil properties cool example he showed was turning it into essentially a bolt action that when suppressed was insanely quiet.

[@3darms]

@@alecubudulecu the kc9?

[@alecubudulecu]

@@3darms I think that’s it. Yes. At makers match 2022 kzbin.info/www/bejne/oZfIaXuro9-NhKM

[@Apocalypsekiller115]

I was gonna turn this video off, and then i saw the mas and realized you are a man of culture.

[@the.original.throwback]

Some of my most enjoyable learning experiences have been otherwise fruitless excursions down a dead-end rabbit hole like this one. Cool video. Thanks.

[@johnnytarponds9292]

I have to say, I'm impressed with your ability to very clearly explain these mechanical systems with clarity that allowed me to very easily understand what you were saying. Great video! ('86-'94 CAF MOC R421) Arte et Marte!

[@dalton_5233]

I am extremely impressed by your video. Very well put together in a concise factual manner. The information you provided was extremely helpful. Thank you for a job well done.

[@Asspiss100]

Absolutely top tier content here. Not only are you sharing novel ideas...but you were not afraid or ashamed to say that your idea failed (not to mention breaking down exactly WHY it failed). This is not seen very often, and most people dont understand just how much of a positive impact that makes as a whole. If you did a collaboration with Ian at Forgotten Weapons, I think that'd be mutually beneficial to both channels. You are similar in the professional style of video structure, you both bring excellent ideas and both make great points on everything you cover. I'm sure you are both extremely busy individuals, and it may be difficult to do so, but I think it would be the most watched and most informative video either of your channels have published. Don't take that the wrong way, because I you and Ian are now my all-time favorite channels

[@Fruhmple]

Your channel is like Technology Connections and Forgotten Weapons had a baby. I love it.

[@Mbartel500]

Very interesting presentation. Almost all new research projects have a very high failure to success ratio, but the knowledge gained is worth the effort. 👍👍

[@lawrencejob]

It’s such a fun idea, although in practice if this worked the heat generated would affect the impedance of the metal and change the magnetic properties and reduce its effectiveness after a single shot. Also the magnets would probably be destroyed from the heat. Also the mechanical forces are an order of magnitude greater than the force you can create with such a small area of interaction, so the equations don’t work the way they’re academically taught. There are limits to the size and behaviour of the eddy currents in a given volume of material. Also the phase delay in the field being generated probably means you won’t see anything meaningful from Lenz’s law in response to an impulse like an explosion. I look forward to future experiments though

[@alanwilson27]

Nicely done! A great explanation of testing theory and assessing results. I am enjoying your series of videos for their engaging detail and as a transplanted Canadian with a keen interest in the mechanics of firearms this title certainly caught my eye. Thanks!

[@thomasadkins7159]

What a fascinating account! Nicely done, my man.

[@rickoshea8138]

You want to damp bolt acceleration early on in the firing cycle, when the gas pressure in the cartridge is the highest. Eddy current damping works better at higher bolt velocity. By the time the bolt has a lot of speed, it has already opened too far; and the cartridge case bulges or ruptures. If your copper inductor and magnets need to be so large that they weigh more than a simple heavy bolt, have you achieved something useful? What is the cost differential?

[@jacktothefuture3554]

Thank you for making this video! I had a similar idea earlier this year, and I was quite confident that it would work. Your insight has saved me a great deal of time. I'm glad I found your channel. Sometimes the youtube algorithm picks you a winner!

[@Muonium1]

Did you consider arranging a series of thin Nd magnets in a Halbach array to maximize the distance and field strength at their braking surface at the expense of nulling it out on the opposite side?

[@CanadianMacGyver]

Actually we did, but given the data from all our other empirical tests, we determined that the combination of losses from the materials, the gap between the magnets and the braking block, and the spreading field lines would still have been too high for the system to be practical. In a .22LR rife, the distance over which the bolt's travel must be delayed is around 1cm, and this is difficult enough to accomplish with a magnetic brake small enough to fit into the receiver. On most cartridges like .223 the distance is even shorter but the force is much higher, making the whole concept impractical.

[@pewpewTN]

​@CanadianMacGyver It would be far more useful in centerfire cartridges. Maybe something like 5.7x28, which is commonly delayed with a lever system. Every .22LR I know of is direct blowback, since a very light slide or bolt & spring is sufficient.

[@chillmonkey6782]

What a learned scholar we have here

[@MultiRomero99]

Might be able to do it with a recessed headspace/chamber 50 bmg if u could figure out a way of preventing the casing from jamming into the wall of the chamber

[@africanelectron751]

I was about to post a similar question

[@thecallankids4718]

So glad youtube recommended this video, and that you shared your results. I was just considering this idea.

[@liotier]

I salute this brave R&D endeavour and the way you make it a learning experience. Clear negative results make science progress !

[@artisan002]

Okay. I'm glad I started following this channel. This was very fascinating. I'm halfway wondering about piezo modules to induce an electromagnetic charge. But, this is far outside an field of expertise I have. Still, I'm glad you showcased this design. Even if it didn't work, it only means that this particular approach didn't. And it still produced valuable information as part of the process.

[@Parents_of_Twins]

The joy of experimentation is that you get to learn something new. I loved doing experiments in grad school because you think it is going to behave this one way and sometimes it does but other times you get the exact opposite and then you get to figure out why. That part of grad school never felt like work.

[@CharlesVanNoland]

Thanks for sharing! I'd had the idea for a magnetic delay system about 3 years ago just fiddling around in my head, I'm glad someone actually pursued it and their findings were here for me to recalibrate my thoughts about eddy currents! I still believe an equally simple delay system is waiting to be found though, without gas ports, rotating bolts, rollers, levers, etc... It's out there somewhere, waiting to be found.

[@staninjapan07]

Another thoroughly fascinating and easy-to-follow interview. Thanks so much.

[@aeonise]

Nice video, and that's an interesting design! At the beginning of the video, I was thinking that your description of how eddy-current braking works (namely that the counter-force generated is proportional to the velocity) meant it would be unsuitable to a delayed blowback system. Such systems need the delay to happen when the velocity of the bolt is at 0 or near-0 (ie. while the bolt is still in place and sealing the chamber), not when the bolt is already in motion after unsealing the chamber. In short, it sounded like the system would produce the least breaking when it matters and the most when it doesn't (or even when it could become counterproductive, depending on the recoil spring). I got a chuckle out of the description of that very problem at the end. That said, I wonder if the same principle might not still be useful in longer-stroke rifles to cushion the perceived recoil by bleeding off the bolt's velocity before it impacts the rear, and magnetic linking might be useful to designs trying to maximize separation between the firing mechanism and the combustion gasses. Also, it's funny how many common technologies boil down to setting off contained explosions...

[@rwsmith7638]

Absolutely fascinating. Your experiment was worth the gain of knowledge and you passed that knowledge on to us. This wouldn't involve your eddy current idea but I suppose a bolt could be held closed electromagnetically until the gas or recoil broke the connection and allowed the bolt to move back.

[@brian.louis107]

I thought about doing a magnetic delay system for the Ruger 10/22 as well, back in 2017. I got the idea from a guy in Minnesota who designed and marketed a magnetic recoil buffer spring for ARs. Don't recall the name of the company. My design was to incorporate several round neodymium disk magnets on the sides of the bolt as well as in the inside surface of the receiver. The magnets would line up, positive to negative, either complete contact or a slight space between them. After sharing my design idea with this fellow from Minnesota, I cancelled it when he said it wouldn't work and gave me a pretty convincing technical explanation of why. I haven't seen my idea appear anywhere in the gun community, so I trust he was right.

[@jessicahamby6373]

Your channel is amazing. When i start making more than 9k a yeay i will support you financially. You have taught me so much that i feel that it is the least that i could do. Thank you for making the collective intelligence of the world a bit elevated.❤

[@thatsthewayitgoes9]

Thank you. Excellent. Good explanation of system. I never thought of your system. Listening to your channel

[@nunyabidniz2868]

Only problem I can see is that the eddy current braking is dependent upon relative motion between the magnet and a conductive [aluminum or copper] substrate, while the *prevention* of relative motion until the critical period is past and the barrel pressure has subsided is the necessary attribute of the breech.

[@j.f.fisher5318]

There's still a lot of potential here. In particular reducing felt recoil by preventing the bolt from sharply impacting the back of the receiver without needing a ridiculously long recoil travel and spring. And generally making a short receiver with a light bolt behave like a long receiver with a heavy bolt. Potentially making an LMG receiver in an SMG receiver's form factor could be more important than yet another unlocking mechanism, even if it's an elegantly simple one.

[@tintin_999]

How would this be done? Having another opposing permanent magnets at the back of the bolt and where the bolt impacts the receiver?

[@martinda7446]

Fantastic. My old Thorens TD124 turntable uses an eddy current magnetic brake for speed control. An ideal application.

[@pkre707]

I have now seen multiple videos from several different KZbinrs attempting to use magnetic breaking in different applications that commonly use mechanical means. Every single time it proves to be ineffective or impractical in comparison to mechanical breaking.

[@Mibit911]

This was an awesome video to watch and had me enthralled the whole time

[@lawrencehudson9939]

I too have seen the King Cobra video, with their 3D printed frame it seems that their system may be more of a continuous recoil system in that the claim is made that it is softer shooting, and when the magnets are removed the system still functions. A magnetic buffer for machine pistols may be what you have.

[@NoahSpurrier]

Makes sense. You need blowback delay at the beginning of blowback, but eddy currents don’t develop until the slide is already moving fast.

[@michaelgray4463]

Very cool idea. Finally, a KZbin video that is TOTALLY honest. An excellent example of real world engineering. Sometimes a great idea just doesn't work out. Thanks for the video!

[@NoosaHeads]

Connect the bolt to a circular mechanism that results in a long horizontal travel. Allow that travel to occur in the rifle stock. That will allow 9" minimum of horizontal travel. You could also permit the travel to be in a tube, reducing magnetic flux losses.

[@freesk8]

Interesting! Good work! You often learn more from "failure" than from success!

[@AdmiralThumbs]

Fascinating! Thanks for sharing your research on this.

[@gruberstein]

Just what I expected. Any electrical engineer with generator experience would have told you that velocity is needed to generate the force. Your little ramp shows it simply. It accelerates quickly then when moving fast enough stops the acceleration. A lever system that moves the magnet through a much longer travel than the bolt would accelerate the magnet much faster. Put the magnet system in the buttstock with a 10 to 1 lever on the bolt.

[@justindunlap1235]

One of my favorite blowback designs it the oerlikon 20mm aa gun. It uses a rebated rim and advanced primer ignition to allow a 20mm cannon to fire from an unlocked breech. By igniting the primer while the bolt is still traveling forward the cartridge must overcome the forward momentum of the bolt before the chaber can open.

[@davida1hiwaaynet]

Fascinating! Very interesting idea and glad you tested it.

[@Dr.Scorpio]

Awesome video. I loved the explanations and the thinking processes and how your team implemented them. Thank you.

[@cogentdynamics]

Very nice video. I subscribed. Finding out we are wrong is often more instructive than being right.

[@Inflorescensse]

My first machine gun was angle delayed-blowback, a Reising m50, fantastic on the range if not on the South Pacific beach.

[@lukehanson5320]

11:32 As a United States viewer I can't help but be in awe that with the draconian civilian-disarmament laws of our northern neighbors you're just casually flashing a (presumably) un-papered SBR on the internet. That aside, thanks for the walk down memory lane to my college (university) physics classes!

[@derekp2674]

The USA has silly laws on the possession of SBRs and suppressors - here in the UK SBRs with barrel lengths of 12" or more are treated the same as other rifles and suppressors are treated as normal rifle components. Suppressors for air weapons can be free purchased in England and Wales.

[@Billsbob]

Sounds like a good idea as a replacement for a buffer system

[@ShlomoWeasenthal]

I use neodymium magnets to delay the blowback of my AR9, they sit on opposite sides of the bolt, I think they work better if I machined the spots where I put them to get them closer to the bolt, you can tell the difference with them on and off

[@Poverty-Tier]

I wonder how your sophisticated system on your AR9 would compare to the simple but effective combo of a KAK 10oz buffer and an AR10 recoil spring on my AR9.

[@OverdriveGaming-plays]

I do wonder if the recoil of a firearm with demagnetize a magnet since it’s getting rattled?

[@ShlomoWeasenthal]

@@Poverty-Tier I was able to remove the weight in the bolt and use a 3oz buffer, it originally had an 8 or 9oz idr, so it calmed the recoil impulse significantly

[@ShlomoWeasenthal]

Ok this is when I just had the magnets on the outside of the gun, this did very little to mitigate recoil, I customized a buffer body with neodymium magnets that attract to the castle nut, I removed the weight from the bolt and replaced the 8oz buffer body with a 3oz customized buffer body

[@billm2078]

​@@ShlomoWeasenthalDo you have a video of this?

[@curtwuollet2912]

I too have pondered how to delay breech opening, so this was most interesting. What is needed is an inertia multiplier or at least something that works like inertia.

[@morganahoff2242]

This was super interesting. Thanks for making this video. I was introduced to the eddy-current braking effect in college, where we used a spinning aluminum disc, slowed by magnets for labs in system controls. I thought, there must be another application for this effect.

[@bobmorris8239]

Very good. Nice to see an experiment gone wrong and such a good explanation.

[@NuffMan_]

Could work slowing the bolt down AFTER opening to minimize the recoil shock of the bolt slamming against the back of the receiver.

[@ibrahimkocaalioglu]

Nice test and trial. Hope you come up with more ideas and test them.

[@zawiszaczarnysulima3700]

I tend to take an exception to a researcher who states that a project failed because the hypothesis (or hypotheses) turned out not to work for whatever reason. Every research project taken to its conclusion is a success, regardless of "positive" or "negative" outcome. In either case the researcher(s) proved something, which was not proven before. In a way, one can compare research projects to a blood test: NEGATIVE - great, you are healthy (or there is a need for more tests), or POSITIVE - great, now we know what's wrong, and we can start working on curing whatever it is. I like to think that there are no failed research or design projects, there are only successful and abandoned ones.

[@melonetankberry5211]

that was very interesting. thank you for sharing.

[@TheLadderman]

This video is extremely interesting and well put together.

[@rozza2012]

High power cartridges require discreet locking & unlocking as even a partial premature extraction will see side wall ruptures of the brass. Where I could see this being useful is as a buffer at both ends of the cycle to delay the bolt allowing extraction & cartridge ramping from the magazine but more importantly to mitigate the bolt's impact of the end of the receiver which causes muzzle climb & the bolt impact with the breach upon closing which causes a bolt bounce as seen in the Rugger .22 slow mo & muzzle drop. Kind of a magnetic version of the Scorpion machine pistol which would allowing for a short receiver, with a slow the rate of fire, a steady force cycle that would mitigate the negatives of the open bolt cycle on assault style weapons.

[@Reman1975]

Working out why some assumed solution to a problem DOESN'T work as expected can provide a greater insight into a subject than 100 "Worked straight out of the box" scenarios.

[@Scotch42]

Love your format and delivery of information. Keep that shit up!

[@UnCoolDad]

Even though it didn't work out, I'm sure you had a lot of fun in the attempt and learned a lot along the way too.

[@EvilJ069]

That 1911 looks... Let's call it well-loved

[@Parents_of_Twins]

Wow, this is a really fascinating video. I wonder if this could be used as a means of reducing felt recoil. Sorry if you answered this at some point in the video I'm roughly half finished with it. I really enjoyed physics II where we learned about electromagnetism and all it's glory. Could have been that my prof was a lot nicer than my physics one prof as well. Dude talked about math like parents talk about their newborns, he did a post doc with Dirac, but was humble. I use to go to him when I had questions in differential equations as well. Just an all around nice guy and really gifted in math.

[@Timm-TGB]

Engineer: "We need a remote trigger release. Let's get a compressor, regulator, solenoid valve, switch, power supply, some tubing and a pneumatic cylinder. We can machine some mounts for it." Shooting community: "Tie a string to the trigger."

[@fmdj]

I'm always glad to see failed results being published, even if only on KZbin, congrats!

[@hubertcumberdale8175]

Hmm I feel there is alot of ways to optimize this to get the forces needed. Thanks for the food for though.

[@GerinoMorn]

The moment I read "magnetic" and "delayed blowback" I knew instantly what the idea is and I love it, it's exactly like some of my wonky firearm ideas :D I love that we're still looking into new ways of operating a cartridge firearms, it's such a fascinating field.

[@evilpandakillabzonattkoccu4879]

1:00 I got exactly what you meant and what a great idea! 👍 It's a shame it didn't work out.... seems like such a great idea and I bet, with the proper funds and time, you would be able to work out any issues!

[@privatezim3637]

It's funny... I intuited the velocity issue within the first few minutes. And yet, I will still say you were a far better engineering student than myself. The modelling, fabrication and experimental method applied is top notch. I had imagined a spaced out magnet in the bolt and/or receiver could provide the braking force required. But it would be very spatially sensitive and lose that key advantage you propose of the inherent scaling for larger forces in the chamber. Additionally I think you underestimated the downsides of putting magnets inside a receiver, especially ones powerful enough to provide compact braking arrangements. The amount of abrasive fouling that would stick to and around a rare earth magnet, especially in a rimfire action... death... just death.

[@y0h0p38]

Personally have not studied engineering, so correct me in I'm wrong, but even if a lot of these rare earth magnets are strong, they don't attract over very far. I had a pair that were strong enough to bend thin metal easily, yet I could toss them in a styrofoam cutout in a box that wasn't even 10 inches across. I assume you could probably have every side of the magnet covered up, and only one side exposed. Ofc it would be a lot of work, but the concept could work with some minor changes

[@TrickstheB]

Very, very nicely done! Highly informative. A question: why didn't your simulations show the mismatch between acceleration (force on the bolt) which the mechanism has to resist, and the velocity of the bolt that causes eddy flux braking? Again --- a very nice presentation. Thank you!

[@derekp2674]

Good question - I wonder what methods the author used to model the electromagnetics?

[@zooblestyx]

Probably the most engaging and fascinating episode of Forgotten Weapons that never was.

[@additudeobx]

Like T. Edison said, I have learned 999 ways not to make a light bulb....

[@nigelman9506]

I have an idea, on the slide of a pistol would have small pneumatic pin and would slot into a socket which has an adjustable air bleed screw to delay the blowback and another pneumatic pin on the back end that's unvented, this would cut down the metallic clunk when using a suppressor, biggest advantages are a full burn for the bullet to leave the barrel the adjustable air bleed screw would allow full blowback on low or high velocity rounds and a quieter operation

[@BrokeWrench]

Thanks for the detailed explanation. I wondered if a mechanism like this could be used for an automotive shock absorber. This rules it out for me because of the lack of initial resistance to movement that i was not aware of

[@Onethirtytwo]

Guns are the coolest things to experiment on. Why not try attaching a rod to your bolt like a gas piston with magnets up front in the hand guard to add more braking force. also you could put a south pole facing magnet on the bolt and a north pole facing magnet in the rear of the receiver to act as a magnetic buffer

[@cthulhurage4580]

In less than a minute i have become completely hype for the idea presented and i want one for its unique mechanics

[@mattwilliams3456]

As a longtime fan and gunsmith I have no idea how I missed this in your back catalog. I’d like to see you tinker with inducing current from the bullet traveling down the barrel and using that to initiate and unlocked sequence.

[@bruddaozzo]

I never understood the excitement for this type of idea. A spring is such a simple thing, not much can go wrong. Trying to use magnets overly complicates it and brings in multiple potential sources of failure. You can't get much more simple and cheaper than a spring....

[@themtube9455]

I love stuff like this, I subscribed. Thank you.

[@stevenkostamo1279]

When you originally said that magnetic resistance of the eddy currents is directly proportional to the force applied, You showed the error in your hypothesis of your design. I have a patented braking system for zipline trolley wheels that uses eddy current braking. While testing various configurations, I realized that the resistive force of the magnetic field is directly proportional to the differential speed of the magnet and the di-magnetic material, the conductivity of that material, strength of the magnet(s), distance between the magnet and di-magnetic material, and if multiple magnets are used in series, alternating their polarity also increases the resistive force. I think you could have made your system work if the bolt entered the breach for about 3-4 cm allowing the bolt to accelerate rearward while still holding/keeping the chamber pressure sealed. This is only when the eddy current resistance would be available to delay the ejection of the spent casing. This project is a great example of how, what we think we understand might be possible theoretically or scientifically, from our education, is often wrong, and thus scientific laws are not accepted and 'settled science' until it can be repeated anywhere and anytime, as a result just because something works in one situation does not mean it will work the same in even a similar situation. I have learned there are very few situations where science is settled, Science is observe, record, report. Education only helps us understand more of what is happening in our life experiences, and it is only during and after those experiences that we truly learn and understand how and why the science we studied works, but also, often more importantly why it didn't work. But only if we are open to the idea that we could be wrong.

[@scottengstrom7308]

I thought that you eddy current idea was a good. I am very impressed with the effort applied to make it work. I am more impressed with your research into why it wouldn't work. I have seen the effects of eddy currents with copper pipe and magnets. It was good to see the fundamental flaw in the idea determined and explained (short travel distance, time). I'm glad you kept at it long enough to find the reason it didn't work unlike the idea and implementation of the Blish Lock.

[@timrobinson6573]

The 3d printing ppl are using magnets for blowback operated pistil caliber carbines. They are adding magnets in a series to the receiver to slow the recoil of the bolt a little bit.

[@MarienFournier]

Thanks for this engineering knowledge. Very instructing.

[@deucedeuce1572]

Not every self loading firearm has a mechanism to slow down the action. Many smaller caliber firearms from .22short up to .380acp are simple blowback operated firearms with no delayed mechanism. That's also true for many 9mm firearms and even some .40'SWs and .45ACP's. The Hi-Point firearms are all straight blow-back if I'm not mistaken,. I think even the .45's and 10mm's are too... and most of the older 9mm SMG's are also (Uzi, Sten, MAC, Sterling, Thompson and many others). Many are in .45acp too.

[@ChrisAthanas]

This is how science works and it’s very admirable to even make the attempt

[@theganozone4133]

Your idea may work in conjunction with advanced primer ignition. Magnetic braking can stop/slow down an object in motion but not an object at rest. If the bolt or a linear hammer was used for API this idea might be helpful.

[@Jared23811]

Interesting project! I think the biggest problem was using 22LR. Very little bolt mass is required to generate high pressures. I'm willing to bet the gun operated fine even with the lightened bolt. Using 9mm, or ideally an intermediate cartridge like 5.56 would generate the higher velocities to maximise braking power.

[@africanelectron751]

Totally awesome stuff I'm quite a fan of the variety in actions.

[@peterparsons7141]

Brilliant. Very interesting and thought provoking. Something I’ve considered, and I’m keeping an eye out for patents etc.

[@JWQweqOPDH]

The magnetic braking force is *NOT* proportional to the applied force. It only depends upon the strength of the magnetic field, its speed, and the conductance of the surrounding material. It can be thought of as fluid drag, but magnetic. At zero speed the braking force is always zero. Note that shock absorbers dissipate energy, whereas springs store energy and locks/lugs involve no energy transfer since there is zero relative motion.

[@wesdblack]

❤ Awesome Sciencing! I sincerely believe that more is often learned from those sorts of projects than less challenging ones

[@tedarcher9120]

It could work in a long barrel recoil firearm where magnets are used as a buffer to reduce recoil

[@SonsOfLorgar]

And on a select fire carbine/rifle or belt fed MG, it can also double as a linear pulse generator to power things like an ammo counter display or even recharging hungrier forms of battery powered accessories like gun lamps, laser range finders or weapon mounted individual radio PTT switches.

[@nickjohnson410]

This is so cool I cant wait for Ian's kids to do a video on this in 50 years.

[@Texsoroban]

A true researchers and scientist..you didn't get the result you were after but it was fun and you got some other ideas. +1

[@stopthephilosophicalzombie9017]

I'm so happy I wasn't the only one who considered eddy current braking as a possibility. I never got off pen and paper, but I thought it might be feasible.

[@joshcarter-com]

At 8:10 you can actually see the problem right away: when you first release the magnet in the channel it accelerates for a moment before the braking effect kicks in. Did the simulation account for the buildup of eddy currents or was the braking effect assumed to be constant?

[@poprawa]

Delay could come from getting magnet unstuck from another magnet. You will get large force at stop, and instant force drop after first millimeters of movement. When spring pushes bolt near to it's end of travel you got bonus acceleration and snap, that dampens whatever movement would like to happen

[@ryewaldman2214]

magnetic braking would be a better application for slowing down a lightweight bolt on, say, a gas-impingement system or ar15-style gas system where you want a lightweight bolt, but you also want "overgassing" for adverse condition operation or suppressed shooting. You would use the braking effect to slow the bolt velocity down before it slams into the rear of the receiver/buffer tube. You get something like viscous damping from the braking system. if your standard damped oscillator is m*a+c*v+k*x = f(t), then bolt/buffer mass, m, and spring weight, k, are typically there, but you can add the viscous damping, c, with eddy braking. the point is, "c" can't replace "m" in the physics