Optimising a Magnetic Launcher

  • Am Vor 8 Monate

    Tom StantonTom Stanton

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Tom Stanton
Tom Stanton

Offset your carbon footprint with me on Wren! We'll plant 10 extra trees for the first 100 people who sign up! https://www.wren.co/start/tomstanton

Vor 8 Monate
Sabizos
Sabizos

Oof pedaling scams

Vor Tag
JJ74Q Formerly Jailbreak
JJ74Q Formerly Jailbreak

@cantarguewithstupid I’ll support that campaign. Besides my storm drain was clogged until I fed it my old oil collection. Now when it floods, it makes pretty rainbows. I’ve had 3 pride flyovers today alone.

Vor 2 Monate
JJ74Q Formerly Jailbreak
JJ74Q Formerly Jailbreak

Carbon footprints a scam. There is no amount of money offsetting something completely natural. The people that started this Wren are geniuses. I wish someone would send me money for a promise to spend .10 of every thousand on trees too. On another note. Nice airplane launcher.

Vor 2 Monate
Nicholas Rehm
Nicholas Rehm

It’s all fun and games at the Nerf match until Tom shows up with a handheld version of this with an automatic trigger and backpack mounted battery

Vor 8 Monate
Dog and cat cam
Dog and cat cam

yes

Vor 12 Tage
Ryan Ali
Ryan Ali

imagine bringing that to a paper airplane contest with a metal airplane that can go 65kmh

Vor Monat
Connor
Connor

Have you met the hacksmith?

Vor 2 Monate
polski dezerter
polski dezerter

@minekid! I have better Idea you put darts in a custom shell that hits a stop at the end of the barrel allowing the bullet to go on than the shell falls down into the container at the lower portion of the gun ready to be reffiled

Vor 3 Monate
Dan Wood
Dan Wood

That slow motion shot of the launch sled falling away from the glider looked fantastically elegant, awesome project!

Vor 8 Monate
Tom Fahey
Tom Fahey

Problem is the sled carries away a whole lot of the gained momentum, rather than it being transferred to the plane itself.

Vor 8 Monate
cnmmd qiuoo
cnmmd qiuoo

given current.

Vor 8 Monate
Colin Winterburn
Colin Winterburn

Tom is a young man who gives me a positive feeling toward the future. We need to support people like him.

Vor 8 Monate
Tom R
Tom R

I'm sure it uses more energy for that sort of launcher compared to the normal way planes take off..

Vor 3 Monate
Greg Petrics
Greg Petrics

But how does it produce value for shareholders?!

Vor 8 Monate
Joseph Wisniewski
Joseph Wisniewski

As others have pointed out, you need to either increase coil spacing with distance, or increase your control speed, which means hitting the coils harder down the line. One way to do that is to distribute the capacitor bank down the length of the gun, adding caps as you approach the end. Your existing system is running out of power as the projectile advances, when you want to be increasing power as it advances in a system with constant spacing. One way to advance the design is to simulate the system. There are SPICE models for coils and moving magnets that can help simulate this whole thing. There are also tricks to shunting flyback into the next coil…

Vor 8 Monate
Grzegorz Mazur
Grzegorz Mazur

@Joseph Wisniewski But I said where you are wrong. Everywhere. Want to elaborate? Here you go: When current flows through a wire, electromagnetic field is being generated around it. Any magnetic object (iron, magnet etc.) will be attracted to the middle of it. Knowing that you should already conclude that first coil has most input on accelerating the projectile because it spends the longest time in its electromagnetic field, while last coil has less time to accelerate it (speed of projectile shortens the time spent inside magnetic field). Ergo: spacing coils will not help. What will help is spending more time in the field (bigger coil, oval shaped maybe?), or stronger field the faster it moves. Second conclusion is that while projectile is being pulled into the middle of the field, then when it passes the middle it will be slowed down instead of being accelerated. To counter that you should switch off your coil when projectile passes the middle. Therefore depending on how he switches the coils on and off (if he switches them off at all, cant figure it out from this video) distributing caps down the lenght of the gun like you wrote, could have oposite effect. Best way to aproach this problem would be to calculate capacitance for each stage, so when coil is triggered by the optic gate it unloads connected caps (normal caps, super capacitors not required) long enough to accelerate but short enough so it goes off before projectile passes middle point. And this aproach is counter intuitive, because with same size coils, capacitors actualy get smaller in size. That aproach would also solve droping voltage problem.

Vor 3 Monate
Joseph Wisniewski
Joseph Wisniewski

@Grzegorz Mazur The hallmark of the drive-by troll: "everything you said is wrong, but I'm not going to say where you're wrong."

Vor 3 Monate
Grzegorz Mazur
Grzegorz Mazur

Not a single sentence that you wrote is correct. Not trying to make fun of you, but its not.

Vor 3 Monate
____________
____________

something from ArcFlash Labs Maybe? xD

Vor 4 Monate
Joseph Wisniewski
Joseph Wisniewski

@Michael Goelz One or the other, yep.

Vor 8 Monate
Torch & Pitchfork PAC
Torch & Pitchfork PAC

Love how the spreadsheet graph matches your test data. You might try flipping the sensors so they tell you when the sled is leaving the coil. Then play with successively larger distances between coils as many have commented. The spreadsheet will help maximize acceleration per coil prior to a rebuild. A fixed distance between coils locks in a maximum speed since pulse timing is critical as speed increases.

Vor 8 Monate
M Sachin
M Sachin

Honestly, your channel is such a gold mine. This is one of the best demonstrations of the engineering process at work: you find the issue, you think of a solution, and then you tinker and optimize until you've achieved what you've set out for. You demonstrate this whole process so eloquently in your videos that it's inspiring

Vor 8 Monate
Ivory AS
Ivory AS

M Sachin I honestly find myself impressed half the time I'm watching.

Vor 8 Monate
Mr me seas
Mr me seas

I like that he has brought up excel for all the crap I've built I haven't used it since high school was a great reminder haha!!

Vor 8 Monate
Jack Martinelli
Jack Martinelli

But I'll bet it wasn't that easy.

Vor 8 Monate
Qwarzz
Qwarzz

I especially liked the process of finding an issue, fixing it, begin happy it worked and then figuring out that it worked for completely different reason than what you thought you were doing.

Vor 8 Monate
NEutebach
NEutebach

my thoughts exactly. the scientific approach is elegant and inspiring.

Vor 8 Monate
Cameron Tacklind
Cameron Tacklind

As others have mentioned, kinetic energy goes up with the square of the velocity. Another way to increase power is to add a flux return path for the magnetic fields. There might be a solution in chaining linearly but, especially for this setup, I think just a chunk of iron in like a "C" shape, oriented Up, around the track, would get you ~3x improved magnetic performance. You'd wrap the iron with your coils and trigger it the same way. Iron is good for these low frequencies but higher frequencies need different core materials. It also makes the steel the "force carrier", as in what actually gets pushed on. It can be a lot easier to hold onto steel than to coils. Notice the individual wire of the foreground coil moving at 10:01 in the video. Eventually that wire will fail as copper fatigues/work hardens quickly...

Vor 8 Monate
BlenderTimer
BlenderTimer

The way the sled detached from the glider was amazing!

Vor 8 Monate
NotaDonkey
NotaDonkey

Greater acceleration per coil could be achieved by having steel "C" cores reduce the reluctance of each magnetic circuit. Using steel cores would increase the magnetic flux for a given current.

Vor 8 Monate
Helge B
Helge B

but it would also drasticaly increase the inductance of the coils leading to slower current rise times, which have to be countered with higher voltage

Vor 8 Monate
Black Fist
Black Fist

That take off was amazing. Looked like a real hi tech launching system.

Vor 8 Monate
Jim Huntley
Jim Huntley

Due to the inductance of the coils, I wonder if the ones towards the end of the rail ever build up full current.

Vor 8 Monate
mincrmatt12
mincrmatt12

An intuitive way (without just plugging in kinematics) to think about why it _looks_ like each subsequent coil imparts less velocity is this: while they all accelerate by the same amount, the projectile is moving faster past later coils, and so accelerates for less time.

Vor 8 Monate
OMGWTFBBQSHEEP
OMGWTFBBQSHEEP

Wow the slow-mo of that glider taking off was glorious. And the release mechanism working exactly as intended!

Vor 3 Stunden
Michael Woodward
Michael Woodward

Great project and video. If you are still looking to optimise further, I would suggest freewheeling diodes on the transistors, putting a fat cap in parallel with the lithium batteries and increasing the distance between the sensor and the coil towards the end of the rail(so it has a bit more time to turn on). Keep up the great content!

Vor 8 Monate
laremere
laremere

2 thoughts: Instead of velocity vs distance graph, try using an energy/time graph. Kinetic energy is equal to velocity squared, so if energy increase is constant, then a velocity/time graph would look like sqrt(t). Using distance instead of time also skews things, and you switch to using time instead of distance for the battery graphs. My guess is that a good curve to have in energy/time graph is a straight line. I love your constant attempts to use super capacitors only to find out batteries work better. Definitely a consistent theme of the channel. I think we both just think super capacitors are so cool and want to find uses for them :) I wonder - capacitors definitely have faster response times than batteries when load changes, while batteries can sustain the load better. Their strengths and weaknesses compliment each other. Did you try connecting both the capacitors and the batteries in parallel?

Vor 8 Monate
Per Westermark
Per Westermark

@varun koganti I think you missunderstood the use of "loss" in the comment. He didn't mean power loss. The decoupling capacitors are there to reduce the *voltage* loss (obviously more often called voltage drop) in the wiring up to the current consumer. And his use of impedance was good because there is both inductance and resistance in the wires - a twice as high current spike will give a twice as large voltage drop from pure rwsistance in the wire, so the decoupling capacitors makes a big difference to keep the voltage up at a consumer with pulsed loads.

Vor 8 Monate
vince pap
vince pap

To be quite frank, it would probably best to have a position vs time graph instead since you cannot accurately measure the velocity as the projectile is constantly accelerating. What he measures is the average velocity over a fixed distance rather than the true instantaneous velocity. If you wanted a true energy vs time graph, you would need to find the line of best fit for the position vs time, and then take its first derivative which then could be used to find 1/2mv^2

Vor 8 Monate
Aaron
Aaron

Super capacitors are great if used as a primary in explosive situations. No primary explosives needed.

Vor 8 Monate
varun koganti
varun koganti

@tboy32 decoupling capacitors are not used as a means to reduce power loss, they act as semi current source when the chip sinks more current(inductance of PCB trace resists this.). You are essentially inductors in this case no point using capacitors.

Vor 8 Monate
dylan valbuena
dylan valbuena

first thought went over my head, but I noticed the same thing for thought bubble two. the combination of both super cap and battery might provide a further stable voltage and current demand

Vor 8 Monate
Russell Dempsey
Russell Dempsey

Thank you so much for walking through your calculations, hypotheses, and conclusions.. I feel like this makes your videos so much better than others.

Vor 25 Tage
Ethan Hale
Ethan Hale

I love watching the progression by tweaking certain factors. I also learned a lot as you walked us through the process. Keep up the great work!

Vor 8 Monate
Dave M
Dave M

Love how much work you put into this experiments. Thank you

Vor 8 Monate
Oyez10
Oyez10

The faster the projectile moves, the fields need to increase in amplitude and decrease in duration over previous stages. Progressively higher voltages with decreasing coil resistances accomplishes this. It gets hairy with the switching in later stages but can be done. Great project Tom!

Vor 8 Monate
Benjamin Morrish
Benjamin Morrish

Many, many years ago I made one of these with my physics teacher at school, I was happy when we exceeded 5m/s and that's where it ended (along with the school year!). This thing is awesome and all props but more to the point, I finally have a video to show people to explain the principle!

Vor 8 Monate
Thomas Kay
Thomas Kay

Love the vid, would having both magnets be able to launch the glider faster? I think it would be less affect by the extra mass. I'm not certain it's just the first thought that came to my head.

Vor 8 Monate
Kriss Femmpaws
Kriss Femmpaws

Tom I find this very interesting, the thought that came to my mind is what happens if you increase the center to center distances of your coils say .125 mm with each coil. This would in effect change the winding timing, this is done on some EV motors to gain rpm for a given voltage.

Vor 8 Monate
GEDUGHUM*
GEDUGHUM*

A great velocity can be achieved; unimaginable to grasp if the material can hold its durability.

Vor 5 Monate
cowcar87
cowcar87

Excellent video, Tom. Very interesting and clearly presented data that you've provided. Keep up the great work. Slow-mo was amazing.

Vor 8 Monate
John Green
John Green

The air gap is still ~40mm long. The other side of the electromagnet is open, so the magnetic flux has to flow to the next electromagnet via air. The overall reluctance is still quite high and can be greatly reduced by tying backs of electromagnets with an iron bar and using a magnet that partially overlaps 2 electromagnets.

Vor 8 Monate
Revi M Fadli
Revi M Fadli

Perhaps also use a Halbach array-style arrangement?

Vor 5 Monate
Mathew Cherrystone
Mathew Cherrystone

@John Green I'm not sure if that is what he meant. In an electrical motor the maximum speed is mostly determined by the induction happening between stator and rotor, because of the moving magnets. What I was talking about was the self inductance of any coil, that limits the current flow, when it is powered and extends the tme it takes to turn it off.

Vor 8 Monate
John Green
John Green

@Mathew Cherrystone yes, this is the maximum speed limit Tom was talking about in the video. It can always be raised by reducing the number of turns in windings, like in any motor. There would be other practical problems, for example the perpendicular pull on the magnets would be strongly increased (I mean ~2 orders of magnitude), so mechanical design and balancing electromagnets on both sides would be very important.

Vor 8 Monate
Mathew Cherrystone
Mathew Cherrystone

Introducing an iron flux guide would likely increase the inductance of the coil. Not sure, if it would still turn on fast enough.

Vor 8 Monate
Tyler Hargrove
Tyler Hargrove

or... a greater density of electromagnets

Vor 8 Monate
Paul Deck
Paul Deck

This is a really fascinating project, thank you for doing it!

Vor 8 Monate
Angelo Valdez
Angelo Valdez

I really enjoy it when you improve your projects, how an engineer thinks and solves problems.

Vor 2 Monate
the agile aardvark
the agile aardvark

I'm amazed by the perfect separation of sled and printed plane. Were there more iterations of it before it worked like this?

Vor 8 Monate
BlueFrenzy
BlueFrenzy

Could something like this be used to give rockets an initial speed boost that allows for a larger payload into orbit?

Vor 8 Monate
SmarterEveryDay
SmarterEveryDay

Twinkle Twinkle Little Star Power Equals I Squared R I'll remember it forever because of this.

Vor 8 Monate
osmacar
osmacar

and guess what i now am gonna

Vor 8 Monate
st1300 r
st1300 r

Never heard that one but bad boys ... for resistor color code is stuck in my head since high school lol. Pretty sure there is a pc version using tortured English but I can't remember what it was.

Vor 8 Monate
kotori87 gaming
kotori87 gaming

I'll be sure to use this at the next opportunity. Thanks, Destin!

Vor 8 Monate
Nelo390
Nelo390

Thanks Destin from SmarterEveryDay.

Vor 8 Monate
Nae Ayy
Nae Ayy

Ayo turbulent flow is the best flow aight

Vor 8 Monate
Lenny M
Lenny M

Interesting and entertaining all rolled up in one video, I love what you do, please keep doing it...

Vor 3 Monate
Matthew Cruikshank
Matthew Cruikshank

I'd recommend lightly oiling the rails as the friction between the sled and the rails would have a significant effect I think.

Vor 8 Monate
cnmmd qiuoo
cnmmd qiuoo

This is a really fascinating project, thank you for doing it!

Vor 8 Monate
Andrew Howard
Andrew Howard

Excellent stuff. I'd love to see the effect of spacing the coils a little more.

Vor 8 Monate
Coneshot
Coneshot

I built a mass driver as a science fair project back in the '80's, I got around the curve flattening by progressively spacing the driver coils further apart as they went down the track. My reasoning was like a transmission in a car the impulses then match the speed of the projectile as it accelerates.

Vor 8 Monate
jim skywaker
jim skywaker

i think i have seen this on some rollercoasters as well, the fins near the end seem to get further apart

Vor 8 Monate
Xmysef
Xmysef

Could be because it’s a ”stage” setup, it works by taking the speed/force from the stage before it and doubling it. The thing with ”parallell” setups is that it accelerates to a certain point until the speed and velocity is equal to the amount of time it takes to pass each coil. So yeah, what you said is quite accurate

Vor 8 Monate
Always Censored
Always Censored

@Anabolic Catalyst Gordon Dickson Dorsai series.

Vor 8 Monate
Mad Scientist
Mad Scientist

This was also my recommendation for his prior vid. Although I was more focused on the speed of his microcontrollers.

Vor 8 Monate
Robin L.
Robin L.

so rather like how a car's 5th gear doesnt have the same torque as first?

Vor 8 Monate
wolvenar
wolvenar

Have you tried spacing the coils farther from each other to keep the timing more similar throughout the rail? This only helps with acceleration to a certain point though mainly where the influence of magnetic flux per time period becomes too long or to short. The optimum spacing may be different at different speeds.

Vor 8 Monate
Nick Garrett
Nick Garrett

Very interesting. you dramatically increased your velocity. I like to think of the coils as inductors instead of resistors. As the velocity increases, the squarewave pulse you apply gets shorter and shorter. in order to reach maximal current at the critical time, these inductors might benefit from being custom. You could kind of control the acceleration by picking specific inductances. Keep it up!

Vor 8 Monate
GordieGii
GordieGii

Nice project Tom. Did you consider using one super-cap per coil (pair) so each one would fire at full voltage?

Vor 8 Monate
Pleyland
Pleyland

The spread sheet section was by far the most exhilarating part of the video. I imagine that the interference from all those magnets must create quite complex patterns. I saw someone mention an induced magnetic field in the sled. Interesting things to consider

Vor 8 Monate
JC
JC

I feel like randomly seeing someone using a trebuchet in England wouldn't look that out of place 🤣🙏👍

Vor 8 Monate
M. R. Wiggins
M. R. Wiggins

Thank you for walking through a method to use a well known physics relationship to assess the quality of a build.

Vor 4 Monate
Crypt1cmyst1c
Crypt1cmyst1c

It'd be cool to see how much you could improve this with a linear rail instead of the aluminum extrusion and sliding sled. you'd need a longer rail than the magnet coil drive and a stopper so the bearing carriage didn't fly off the end

Vor 8 Monate
L_Trapp
L_Trapp

You could also try to use the batteries in parallel with the capacitors, that way you can keep the voltage drop a bit less.

Vor 8 Monate
Matt Hunter
Matt Hunter

A faster moving projectile has less time to receive a push from the coils, reducing their effect the faster it goes.

Vor 8 Monate
Monster Pumpkin
Monster Pumpkin

I absolutelly love your optimization videos ! Not only are they very entertaining, they are also extremely informative, giving both information regarding the topic and insight into the mind of an engineer

Vor 8 Monate
Strvggle
Strvggle

Coolest video series i have watched in a while , Good work and was very relatable to my old physics classes

Vor 8 Monate
MartinStangMan
MartinStangMan

You should play with timing and separating every other coil so that voltage sags are offset.

Vor 8 Monate
travis zane
travis zane

I would recommend using silicon lubricant to help reduce friction of the rail for a higher top speed

Vor 8 Monate
Чё Бля
Чё Бля

I love how this channel started as modelling planes and various flying ... things (some of them is hard to describe) but then evolved into trebuchets and now its about building a coilgun.

Vor 8 Monate
kindlin
kindlin

I know sarcasm is hard on the internet, everyone, but we're just taking our lead from the video.

Vor 8 Monate
i eat nazis
i eat nazis

@kindlin haha i’m going to say something that’s wrong and say it’s a joke. very funny.

Vor 8 Monate
Чё Бля
Чё Бля

@Snakeman91605 it's not RAILGUN, he even mentioned it specifically in this video.

Vor 8 Monate
Stephan Buchin
Stephan Buchin

10:54 that dropping is really cinematic 😎

Vor 6 Tage
mattmilladb8
mattmilladb8

This is awesome. I want to build a larger one…

Vor 8 Monate
Socks With Sandals
Socks With Sandals

That was an amazing demonstration of electromagnet propulsion.

Vor 5 Monate
Trey Smith
Trey Smith

Wow, that's a fantastic project! Nice work sir!

Vor 8 Monate
Incroyables Expériences
Incroyables Expériences

A way to know which reason is the most limiting would have been to make a regression, it the curve is close to an exponential it's mostly a back EMF reason, if the curve is close to a square root, it's mostly due to kinetic energy (harder and harder to increase for a given power).

Vor 8 Monate
Incroyables Expériences
Incroyables Expériences

@muggzzzzz No, the back EMF (voltage) is in the other way but the current still flows is the same way. A diode would only prevent to use the linear motor as a generator if a magnet was sliding very fast (the back EMF would be higher than the power supply).

Vor 8 Monate
st1300 r
st1300 r

@muggzzzzz that won't work. A magnet moving past a coil will generate a voltage. Back emf is not a problem. It is just a fact and the reason a motor doesn't draw locked rotor current at idle under no load. If say you put a reverse diode across a relay coil you are shunting the collapsing magnetic field and preventing a high voltage spike but you're still dumping the energy. It doesn't prevent it.

Vor 8 Monate
muggzzzzz
muggzzzzz

You could just connect a powerful diode to prevent the back emf.

Vor 8 Monate
Ivory AS
Ivory AS

Incroyables Expériences Hey, a French YouTuber! Guess I'll head over to your channel to practice some.

Vor 8 Monate
st1300 r
st1300 r

@Troy Walker if you double the speed you have 4 times the energy. If you are moving the magnet fast enough its field (back electro motive "force") cancels the force from the energized coil so no power transfer to the magnet. Think of it as the motor (the power into the coils) equalling the generator (magnet moving past the coils) You'd call it the motors no load current and speed. A motor and generator are the same thing it's a matter of do you put electricity into it so it spins or you force it to spin and get electricity out of it.

Vor 8 Monate
Dario
Dario

Nice video! Have you tested the batteries with the capacitors? That would be the ultimate power source with your setup.

Vor 6 Monate
Graham D.
Graham D.

Hey Tom, this was really cool. Next time maybe you can invert the design and make a plane that's the rail/powersupply, and the a runway that's a stationary magnet. :D

Vor 8 Monate
ArtLancer
ArtLancer

I loved the part when he just smartly pivoted the plane to the slet

Vor 8 Monate
Mackdaknife6669
Mackdaknife6669

cool project! I've always been a fan of linear induction motors!

Vor 8 Monate
Máté Kovács
Máté Kovács

A few ideas: - You don't have to reverse polarity to also push the sled. You can just use a second Hall sensor located after the coil, and a second winding on the coil wired up in inverted polarity, so when the second Hall sensor turns on the second coil, it will push. With the position of the sensors, I think it can be timed perfectly. Yes it is 2X the components (and thus cost and power draw), but also roughly 2x the force at each magnet, resulting in a speed increase. - With a lubricated sled (and the plastic part of it shaped aerodynamically), most of the drag on the sled would be eliminated. - I've also noticed on the high-speed footage that the coils lean in a bit when active. This is expected as per Newton's third law, but the coild might need to be mounted more sturdily.

Vor 8 Monate
AJF
AJF

@Jack Martinelli Make a video and post it man!

Vor 8 Monate
Máté Kovács
Máté Kovács

@Robert M Kreegier That is only when they are connected to a capacitor, forming an LC oscillator. If you look at current vs time when you turn off the power source (and current is proportional to the magnetic field), a coil by itself would produce an exponentially declining curve, approaching zero as you go towards the end of time. Same goes for capacitors by themselves. But together, they form an oscillator. The resonant frequency is 1/ (2*Pi*sqrt(L*C) ) where L is the inductivity of the coil and C is the capacitance of the capacitor. That is when coils ‘ring’. Now most systems have parasitic capacitors in them even if you don’t connect a real capacitor. For instance, there is a small capacitance between the windings of the coil, and in the transistor used to drive the coil. But yeah, by adding real capacitors and tuning the resonant frequencies to match the speed of the sled at each coil, the polarity could be reverted at the right time. You would need to turn off the oscillator at the right time though, because you don’t want a second pulling half-period to slow down the sled. It would create a nice sine wave when it is on, which is not optimal (the magnetic force is nat always maximum when needed), but simpler in circuitry than reversing the polarity using a switch or more complicated solid-state circuitry.

Vor 8 Monate
Tedlasman
Tedlasman

agree

Vor 8 Monate
Ben Sinor
Ben Sinor

@You_just It would only induce a current if the coil was switched on. With no completed circuit in the other winding you will only induce a potential but almost no current flow. Therefore efficiency loss will be minimal. This is why transformers with multiple taps are fine because the other portion of the winding doesn't have the circuit completed.

Vor 8 Monate
Robert M Kreegier
Robert M Kreegier

I'm not an expert on the subject, but don't coils "ring"? Like, when you remove the power source from a coil, doesn't the magnetic field collapse and then reverse or something? Could he tune the coils so that their resonant frequencies match the speed of the sled entering and exiting their fields?

Vor 8 Monate
dcoog anml
dcoog anml

cool project! I've always been a fan of linear induction motors!

Vor 8 Monate
zuygj bnsv
zuygj bnsv

cool project! I've always been a fan of linear induction motors!

Vor 8 Monate
Larry Manuel
Larry Manuel

Totally excellent. Especially the slo-mo videography of the glider launches at the conclusion. Thanks!

Vor 2 Monate
Victor's Lab
Victor's Lab

You may be able to increase the final velocity, by spacing the coils farther apart, further down the rail. This will make the launcher longer, but should also make it faster.

Vor 7 Monate
3D Printer Academy
3D Printer Academy

cool project! I've always been a fan of linear induction motors!

Vor 8 Monate
Voidsand
Voidsand

Its not a linear induction motor - only since the projectile is a magnet. If anything, the magnet is inducing a back current into the coils (hence the use of smaller coils) which only serves to slow down the acceleration, thats the only place that induction is happening, but its unintended

Vor 8 Monate
Mary Zmijski
Mary Zmijski

@3D Printer Academy more efficient

Vor 8 Monate
3D Printer Academy
3D Printer Academy

@Mary Zmijski what is the difference between LIM and LSM?

Vor 8 Monate
Tarehjerne Tarehjerne
Tarehjerne Tarehjerne

This is not an induction motor.

Vor 8 Monate
Click It
Click It

@The Scubersteve Yes, Mary is right. This is more of a LSM.

Vor 8 Monate
qopoy dnon
qopoy dnon

cool project! I've always been a fan of linear induction motors!

Vor 8 Monate
Rock girl
Rock girl

cool project! I've always been a fan of linear induction motors!

Vor 8 Monate
Krishamsu B. Subedi Chhetri
Krishamsu B. Subedi Chhetri

This shows what engineering really is. Can’t wait!

Vor 8 Monate
Nathan Scantling
Nathan Scantling

Tom, would increasing the distance between the coils by say 10% at each block have an increasing effect?

Vor 3 Monate
Bjorn de Jong
Bjorn de Jong

you make physics so much more interesting keep it up

Vor 8 Monate
Twilley
Twilley

Ok so im very interested in printing this glider! Amazing work man! Is there any way you can give me more info on knowing the weight using infill? I use cura. Also print in the orientation as shown in thangs? Thanks!!!

Vor 8 Monate
Alberto Perez
Alberto Perez

Impressive Tom! Congratulations for your work. Do you think an RC flying wing shuttle could be made with this system? Maybe it would be too cumbersome?

Vor 3 Monate
GUT BOI
GUT BOI

I have an idea, you can add some lubrication on the sledge. It will work faster. I realize, the navy rail gun use a coil too for their rail gun, connect the sledge first then connect it to the coil in serial. In that serial combination all the current will be resisted by the coil (in serial way) therefore the sledge will not melt caused by the high amp. I would love to see you make it. ;)

Vor 8 Monate
runforitman
runforitman

4:30 I did physics this year and used these a lot, but I've never heard them be called "SUVAT" I assume some call it that because those are the variables it takes? I think we just called them "equations for constant acceleration"

Vor 8 Monate
Cameron136
Cameron136

I’ve always seen them called the kinematic equations. And some of the variables had different letters. Maybe it’s an American thing? Or maybe it depends on what subject you’re studying

Vor 8 Monate
Duane Degn
Duane Degn

I used to teach high school physics and this is the first time I've seen the equations called SUVAT.

Vor 8 Monate
Permire Fabrica
Permire Fabrica

We just don't call them somehow special. We just calculate the integral of the acceleration to get the velocity. The benefit is, that the formula found like that is also true for not constant acceleration.

Vor 8 Monate
Nicholas N.
Nicholas N.

To me they’re called kinematics equations

Vor 8 Monate
Robert Roberts
Robert Roberts

Change the winding count on every successive coil for a smoother acceleration to maximum.

Vor 8 Monate
LeInfidel
LeInfidel

One question 🙋🏻 how far did the plane go ? Did faster speed = greater distance ? Or was the added weight of the new glider a factor ?

Vor 8 Monate
Adam Landrum
Adam Landrum

Quality videos as always Tom. Way to go!!!

Vor 8 Monate
GEDUGHUM*
GEDUGHUM*

Just asking, what rpm can this achieve by arranging the rail on a circular loop; allowing the rail bar travel along the circumference of the circular path?

Vor 5 Monate
Amélie Lacroix
Amélie Lacroix

For those still confused about the difference between railguns and coilguns: Railguns use two rails and lots of electricity to launch a projectile with the Lorentz force. Coilguns have a projectile that goes through the center of a group of coils stacked like donuts, with the ones in front of the projectile attracting it and pulling it forward, and ideally, the ones behind it repelling it and pushing it forward. The magnetic launcher in the video uses the same principals as a coilgun, but with the way the coils are oriented, calling it a magnetic launcher would be more accurate since its primary purpose and design is for it to launch stuff from the sled rather than simply using the sled itself as a projectile like a standard coilgun would.

Vor 8 Monate
Sister Perish
Sister Perish

@Hindu Goat Plenty of people say gauss rifle/pistol for coilguns, especially because of Fallout.

Vor 8 Monate
Otzkar
Otzkar

@Hindu Goat ? A coilgun still isn't the same as a railgun tho.

Vor 8 Monate
Hindu Goat
Hindu Goat

yeah but no ones ever heard of coil gun, everyone says railgun regardless of the precise arrangement of the magnets. Its like everyone says 'literally' to mean actually... but it really means 'as per the literature'

Vor 8 Monate
Razia Sultana
Razia Sultana

Thank you for nicely explaining the concept

Vor 8 Monate
Teigh Brunton
Teigh Brunton

I'd love to see more of this!

Vor 8 Monate
Fark Tard
Fark Tard

@10:52 is why I love this channel! Thanks for going to the effort to capture this Tom :) Magic!

Vor 8 Monate
racvets1
racvets1

Since you have sensors to detect where the sled is, could you use them to predict where the sled is and go faster than the initial timing? (The gap between the coil and the sensor) Also, then could you create more field by turning on the next one earlier, or hold the current one a little longer/shorter to match the center point of the magnet before shutoff?

Vor 8 Monate
Suspense_Comix
Suspense_Comix

My theory on why the sled slows down is because of the resistance of the coils and wire. Inductance and resistance are almost the same thing.

Vor 7 Monate
Brandon Ward
Brandon Ward

You could also try launching steel, while it won’t have as much of a generated magnetic field, I feel as if it may give you a acceleration advantage because it’s not canceling itself out therefore allowing more coils(and unlimited amount of coils) throughout the launcher Also you can try dry graphite on your launcher which will make the friction very minimal on your sled(trick used from pinewood derby cars)

Vor 8 Monate
Hello Santa
Hello Santa

If you use steel, it doesn't generate its own magnetic field so the electromagnets would have to provide more power. Not only this, how would you detect and accurately time the coils as hall sensors are now worthless?

Vor 8 Monate
Aidan Macnamara
Aidan Macnamara

Cool video! A friend and I were just discussing the issue of sag in regards to the difference between a Lipo and Li-ion for launch as he was not getting the expected launch thrust. Basically this was due to the volts dropping a lot on the Li-ion, resulting in less motor speed and less thrust even though the throttle setting was the same.

Vor 8 Monate
Ethan Intrepidi
Ethan Intrepidi

For the launcher I would use something similar to drawer slides with ball bearings to keep the sled in place.

Vor 8 Monate
Let's Make
Let's Make

Great video, it was interesting to see the velocity over time

Vor 8 Monate
Harshit Chauhan
Harshit Chauhan

The electrical genius of this guy is deeply underappreciated.

Vor 8 Monate
plumberman19
plumberman19

Tom, you're my hero! With strong affinity for the mechanical/physical realm, and unfortunately now quadriplegic, I live vicariously through your videos! So now I'm back in school for computer science/software engineering. You're a huge inspiration and I look forward to all your videos Please don't stop uploading.

Vor 8 Monate
Voltechs
Voltechs

I love this. Such a nerd for this stuff. Nice work. Let's get planes and spaceships using this! I've dreamed of this since I was a little kid.

Vor 8 Monate
Timo jissink
Timo jissink

This is so well explained that I almost understood it!!

Vor 8 Monate
Mikko Rantalainen
Mikko Rantalainen

10:45 That airplane sledge was really clever! Nice design.

Vor 8 Monate
Dante Cavallin
Dante Cavallin

You could also coat the rail and sled with teflon to reduce the friction from the plane pushing upwards.

Vor 8 Monate
Ray K
Ray K

I do love projects like this and have a multi-stage coil gun that I've built myself to explore this fascinating area of physics. I do find your design to be quite interesting in general with having the idea of "un-rolling" a standard electric motor to make a linear motor. The way I had managed to maximize my projectile velocity was to move away from super capacitors and move towards high voltage caps with a much lower capacitance. Since P = IV or I^2*R, and capacitor potential energy is a function of both the capacitance and the voltage squared I found that operating with more voltage and a capacitor that drained very quickly with P also being equal to J/s I managed very high speeds with far less coils. Perhaps moving towards high voltage and lower capacitance could yield an even higher end velocity with your design. Oh and I found it quite interesting on how many people thought that your device was a "rail gun". While both your device and a rail gun are both linear motors, you system is far more similar to a coil gun since rail guns operate on quite different systems. I guess this may be a result of people hearing a term tossed around online without understanding what that device is. I hope to see more wonderful projects from you in the future.

Vor 8 Monate
kanal
kanal

Could you make the sled magnet-levitating maybe, to reduce the friction it has from the rail now?

Vor 6 Monate
sporadicamnesic
sporadicamnesic

Loved watching the 3D printed glider launch, however it did remind me of archive footage of the V1 launch tests. (My mum used to work for the IWM Film Archives so she used to get copies of wartime testing footage for me to watch including the Bouncing Bomb studies)

Vor 5 Monate
Draconus Spiritus
Draconus Spiritus

A suggestion. Make the ramp longer. Gradually increase the distance between the coils.

Vor 3 Monate
Elliot Mapp-Best
Elliot Mapp-Best

Always useful, Always inspiring...!!! Good work Sir.

Vor 8 Monate
ernie5229
ernie5229

I used to wind and assemble r/c brushless motors. As far as I can tell, they are pretty much identical to your linear motor. The fewer the winds (w/heavier wire) the faster the motor, but the lower the torque. What would happen if you had progressively fewer winds as the carrier went down the track? It would start off at low speed w/high torque, then go progressively to high speed with low torque. Much like gears in a car. The last few coils could be only a few winds (with heavy wire OR multiple strands in parallel) and this would really kick up the speed. Also, work to get the air gap between the coils and the magnet as small as possible. The magnetic attraction (reluctance) drops off as a square of the distance. In motor construction, this is the easiest way to increase efficiency. This is hard to do in mass production, but with a DIY project the effort really pays off. Reduce the gap by a power of two and get four times the output power!

Vor 8 Monate
Mike Smith SylaR
Mike Smith SylaR

@Jebimasta He did design a new sled to reduce this gap. To further reduce it he could reduce the thickness of the plastic between the coil and magnet

Vor 8 Monate
Jebimasta
Jebimasta

I'm a bit confused, is this not what he did? apart from increasing the wire size. He reduced the gap and the number of windings.

Vor 8 Monate
sandos
sandos

I actually was sure the video was going this route, was surprised to learn it didn't.

Vor 8 Monate
Lars on tars
Lars on tars

What if you lower the magnets even a bit further, would it gain more by reducing the friction then it loses by pulling upwards?

Vor 8 Monate
Joshua Fifis
Joshua Fifis

The slow mo glider take off was just mint!

Vor 8 Monate

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