I love how the rolling shutter video was all about how Destin had done it the hard/expensive way and Matt showed how to do it on the cheap. Then this video is "Hi I hired a helicopter and a really fancy camera"
@@jacksonstein809 I'm not sure which of us you're saying that to, but we know. Well, we know it's called a collaboration and is often abbreviated to a collab.
Is it great because you feel it’s worth paying money to get something hours before it becomes free to the world? That’s like buying a DVD copy of “A Christmas Story” on Christmas Eve.....
@@bryanw4582 that's just a welcome side effect :) The good part is the quality of free content improving because I am actively deciding to support it with money.
Matt discussing rolling shutter effect using a photocopier: “... a lot easier, and a lot cheaper!” Matt discussing stroboscopic effect: “SO I HIRED A HELICOPTER!!” {blaring rotor noise}
It's always fun to watch LWT and when there is only like 5 minutes left of the show and he starts to hone in on a specific ridiculous thing related to the topic. Then you know what is comming...
I always wondered... how do RUclipsrs do simple collabs together? Do all RUclipsrs just constantly chat about what videos they plan to make? Did Cap,n D and Matt reach for the same article on Wikipedia when their IP addresses touched and they looked at eachother and just knew they were gonna collab on a video.... How? Especially when it seems like they are such unrelated channels or have different crowds of fans? I really wanna know.
You asked this three years ago and never got an answer, so I'll try to help. Often, these kinds of collabs happen through one creator reaching out to another and suggesting they boost each others' channel. Agree on a topic, each make their own video, and save time to script/record cameos for each other. Great way to work around busy schedules and coordinate with someone long-distance. On the topic of being unrelated/having different communities, that's actually a very good thing in this instance. Both channels deal with pretty "nerdy" topics, so there's a good chance that someone interested in math is also a curious skeptic and visa versa, but because these creators cover very different topics, there's a good chance that a collab like this may be the first time many viewers are hearing of the other channel (thus, gaining recognition and views from someone who otherwise wouldn't have discovered them).
Whats really cool about this specific video is: because of how close the chopper is to the camera, you can clearly see the swashplate (more accurately the control arm) rotations while the blade is stationary. 8:08 is a perfect shot of this, where the blade itself and the supporting arms seem to be stationary, but the inner arm still clearly looks like it is spinning.
Which is extra cool because it means even if they hadn't said all the numbers in the video you could tell the framerate is a multiple of the any-blade-pass frequency but not a multiple of the full-rotation frequency...
It's been a really rough couple of days. Your content always brings me joy, and the cameo with Captain Disillusion was absolutely perfect. Thank you both.
Assuming you can not only manually set the framerate but also manually trigger capturing one frame, you could set a light sensor (that only looks directly up) on the roof of the helicopter and make the camera shoot a frame exactly as one blade passes over.
Honestly I think that bit at 6:51 is great. They're "almost" stopped. You've proven the point, and I actually think it's interesting to show that you can get any apparent speed you want, or reverse the direction, etc. That shot of the wagon at the beginning where the wheels were s pinning backwards was great too.
Nice work Matt. I thought I should mention the terms Nyquist rate and Nyquist Frequency for others to look into if they are curious. Something that some of us use in our day jobs.
Yes I think you are right. It looked to me so similar to the camera the Captain used, so I thought they were they same. They really do bend. But the blades don't take up much vertical space, so it isn't that obvious.
That is a seriously good camera, and so is the second one used for the helicopter footage. This video is by far and away the best quality on this channel....
Your intro had some amazing product placements (speed cube, book refference, soccer ball, Taurus problem cup, and even the blades refference your rotoscoping shutter video)... AND a collab with Captain Disillusion! Well done!
I have Caption Disillusions "Static Helicopter Blades" video right next to this one on my sub page! What a coincidence...? Edit: And no coincidence at all. I should've known!
Just want to point out how badass a pilot Pauline is. Hovering is hard and one of the first things drilled into helicopter pilots is to get up to a decent altitude so they can recover or even autorotote (trade altitude for rotor speed) if there's a problem. I would have guessed she was an ex-military pilot, and certainly not that she is someone who learned to fly a year ago. Wow.
I notice that Captain hasn't commented on your video, unlike you on his. I guess your relationship doesn't withstand the symmetric property of equality.
You know, I feel blessed by living in this era, with such challenges and resolutions for the usual physical phenomena that we encounter every single day without noticing it. Like, 20 years ago I wouldn't even imagine to witness an experiment like this one. And be one step closer to understand what the f** is this reality embedded in everything we ever experienced.
Been a fan of your content anyway beforehand, but I saw the recent Captain D video and it reminded me to come over here and check for new videos again. Keep up the entertaining work ;)
Never thought the two channels that I love so much, that are highly niche and have nothing to do with one another would ever join forces. This is crazy
Normal RUclipsr: Hey we got access to a helicopter, let's do cool and crazy stuff! Matt: Let's match the de framerate of a camera with the rotors! You got to love this guy!
Came here from Captain Disillusion's channel. Never watched any of Matt's videos before but I instantly recognized the voice. He was on a podcast called The Badcast eons ago doing a whole bit on homeopathy. How about making a video on that, Matt? I loved the maths in that.
Itis also related to the sampling theorem, which says that you can only record frequencies lower than half of the sampling rate and all the other will just be moved to values between -fs/2 and fs/2 periodically.
A fun part of taking advantage of symmetry is that the object often isn’t perfectly symmetrical. Any blemishes would show up. Matt’s 4-bladed example is made of 2-blade props with an axial offset and generally lousy alignment. In the real helicopter, there’s only one scissor link alongside the mast betraying the true rotation.
Great video, thanks. It combines multiple passions of mine: Helicopters, math an technilogy. This effect is also know as "aliasing". This term is often used in digital signal processing.
It's funny how easily it happens by accident, but how hard it is to do deliberately. Thanks to all the team, for what must have been fun, but a lot of work.
So what you're saying is that it's probably easier to hire two helicopters, leave the lighter one turned off and hang it from the big one? I think the patent on David Copperfield's rig has run out too if you wanted to make the wires really hard to see and stop the blades sagging.
Why limit to just rotations? The same effect can occur with any sort of movement. For example a camera on a train going past a fence where the framerate matches the bars in the fence as they pass by; it'll look like the fence is static or rolling along with the train.
Very very impressive. The thing that really caught my eye was the mirror like surface on the blades when in rotation. (See timestamps 4:17, 7:01 for examples).
At 3:16 you can see three broad triangular grey bands that slowly rotate, with a relief of three triangular bands that are completely transparent. Evidently the sum of multiple rotations yields a lower frequency pattern that is the sum of the higher frequency input. There's a more challenging maths problem.
Matt I just want to say your performance in Captain Disillusion’s video was breathtaking. Could you say 3 time 60 is 180 just once? That’d be brilliant, thanks!
For those of you that scroll this far down, here's something cool and really nerdy: The more complicated explaination of what's going on here is explained mathematically by the Nyquist-Shannon sampling theorum. In layman's terms, your "frame rate" (sampling rate) can only correctly capture spinning things with HALF of that "frame rate" (frequency). Everything above "half your frame rate" gets mapped to a lower frequency and looks wrong. This also applies to audio signals and a bunch of other cool things! If you made it this far, I hope you learned something cool :D
I'm sure someone else already pointed it out, but 26.75FPS was the MAX FPS that would have worked. Going to 52 picked up the blades at half points. What you needed were multiples of the Inverse of the FPS. The SPF (Seconds Per Frame) if you will. You needed multiples of the period, not the frequency. Super common to mix up periods and frequency.
Fun fact: helicopter blades rotate at constant speed and they adjust the lift they produce by adjusting the angle of the blades. So even when they've landed the blades still spin at full speed. I used to believe they went up and down using the throttle. Which is actually what toy helicopters and quadcopters do.
2017 Matt: I've just bought a propeller, it cost me less than ten pounds and I could do exactly the same thing with this 2019 Matt: *SO I HIRED A HELICOPTER!*
Even with the slow moving blades, it proves the point. But the speed of rotation is also changed by the strain put on the blades. So going up will slow it down a bit, and rotating the tail will also change it. ^_*
I remember this from my high-school science class. And Mr. Wizard's World. It's a good experiment, made better with just the right amount of math and helicopters.
![Kodak Black - Catch Fire [Official Music Video]](http://i.ytimg.com/vi/A4ch-olIuZo/mqdefault.jpg)
Looking forward to redoing this in a snarky way for less than $10 worth of gear. 😉
Looking forward to see your video !
I'm looking for my 10 dollars
gamer
It's karma time :D
But, will Captain D. approve your video?
Video expert on Matt’s channel: “Yes it’s real”
Mathematician on Captain Disillusion’s channel: “3 x 60 = 180”
equals
Perfectly balance... as it shud be
+
I'm a big fan of Matt's channel, but this time I was brought here from Captain Disilusion's video :)
Same
Of course, when the notifications come an hour apart and are stacked one on top of the other.
Same
Same
Same
I love how the rolling shutter video was all about how Destin had done it the hard/expensive way and Matt showed how to do it on the cheap. Then this video is "Hi I hired a helicopter and a really fancy camera"
And then Captain D shows how to do it with a ceiling fan and a strobe light Haha
There's always the fun way, and the cheap way!
And then Destin commented on this video that he needs to come back and do a snarky cheap version
Looking forward to Destin doing it the cheap way this time
Captain D actually bought an expensive motion tracking thingy for a video that time 😂
@@DanteYewToob I got bored once and did it with my pc fan and a strobe app on my phone
I knew it couldn't be a coincidence that both you and the Captain uploaded on the same day about the same topic.
I wondered if Matt had an incredibly quick response. But then, Destin pipped him to the post with the related video before!
It’s called a collab
@@jacksonstein809 I'm not sure which of us you're saying that to, but we know. Well, we know it's called a collaboration and is often abbreviated to a collab.
Getting early access to other people's videos by paying the Captain money is truly great.
How early was your access? I didn't give him money lol
@@inund8 same, i would if i wasn't broke though
@@inund8 video was listed 1 hour ago, zeta commented 2 hours ago meaning he got the unlisted link an hour early
Is it great because you feel it’s worth paying money to get something hours before it becomes free to the world?
That’s like buying a DVD copy of “A Christmas Story” on Christmas Eve.....
@@bryanw4582 that's just a welcome side effect :) The good part is the quality of free content improving because I am actively deciding to support it with money.
Since Matt hired a helicopter and Tom Scott's hired a plane, is anyone going to make it a rule of three and hire a hovercraft?
Tom already did that at the end of an episode of Citation Needed (7x02).
Also Tom Scott! (And Matt Gray, and Chris Joel, and Gary Brannan). See Citation Needed season 7 episode 2.
Okay, yeah, but someone needs to make the "so I hired a hovercraft" joke too for it to be a true rule of three.
Well mark.rober hired a private jet for bahamas
Also Tom Scott did a hovercraft bar video
Matt discussing rolling shutter effect using a photocopier:
“... a lot easier, and a lot cheaper!”
Matt discussing stroboscopic effect:
“SO I HIRED A HELICOPTER!!”
{blaring rotor noise}
I love how it went the other way around this time
So we'd need to hire a helicopter
*SO I HIRED A HELECOPTER*
i laughed out loud
That profile pic (chika's expression) is just like cherry on top of the cake for the comment :'3
Mwahahaha ....
how much?
Why didn't he just get a drone?!
"so I hired a helicopter" you went full john oliver, Matt
Guinness world record for Matt?
perfect analogy
It's always fun to watch LWT and when there is only like 5 minutes left of the show and he starts to hone in on a specific ridiculous thing related to the topic. Then you know what is comming...
He's like a handsomer, smarter, and funnier version of John Oliver.
Brought here by Tom Scott's "appropriation" of your hiring a helicopter gag.
I love that Captain D. and Matt were equally dismissive of each other's support drop ins.
Matt, 2017: "See you don't have to hire a fancy aircraft, you just need a printed propeller and a scanner!" Matt, 2019: "So I hired a helicopter!"
Matt, 2021: "Let's just show some explosions, it worked so well in mythbusters" 🤨
It looks like his youtube channel is quite profitable :)
Wow. Amazing! I just watched Captain dslusions video and recommended this video. Pretty cool!
Good ol’ Captain D. They’re amazing.
Maybe load it up with bricks till the speed matches what you can do with the camera?
Cody'sLab Hi! I really enjoy watching your channel 👍🏻
Or empty a bag of sand gradually, from above
@@sanjeen2503 there ya go! dump ballast!
Thats Cody's way lol!
Woo! Captain D and Matt Parker together!
I've never seen someone so full of unadulterated joy as when Matt says, "So I hired a helicopter!"
I always wondered... how do RUclipsrs do simple collabs together? Do all RUclipsrs just constantly chat about what videos they plan to make?
Did Cap,n D and Matt reach for the same article on Wikipedia when their IP addresses touched and they looked at eachother and just knew they were gonna collab on a video....
How? Especially when it seems like they are such unrelated channels or have different crowds of fans?
I really wanna know.
Love the thought of romantic IP encounters!
sounds like a match made over wifi
You asked this three years ago and never got an answer, so I'll try to help. Often, these kinds of collabs happen through one creator reaching out to another and suggesting they boost each others' channel. Agree on a topic, each make their own video, and save time to script/record cameos for each other. Great way to work around busy schedules and coordinate with someone long-distance.
On the topic of being unrelated/having different communities, that's actually a very good thing in this instance. Both channels deal with pretty "nerdy" topics, so there's a good chance that someone interested in math is also a curious skeptic and visa versa, but because these creators cover very different topics, there's a good chance that a collab like this may be the first time many viewers are hearing of the other channel (thus, gaining recognition and views from someone who otherwise wouldn't have discovered them).
Whats really cool about this specific video is:
because of how close the chopper is to the camera, you can clearly see the swashplate (more accurately the control arm) rotations while the blade is stationary. 8:08 is a perfect shot of this, where the blade itself and the supporting arms seem to be stationary, but the inner arm still clearly looks like it is spinning.
Which is extra cool because it means even if they hadn't said all the numbers in the video you could tell the framerate is a multiple of the any-blade-pass frequency but not a multiple of the full-rotation frequency...
Love with your heart and use your head for everything else!
Nice to hear that from you, Matt!
So would this collab be called a "Quick maths" or a "Standup D"
Both are equally amusing so I wouldn't object to either
i vote standup d
2 + 2
= 4
Ans - 1
= 3
Collab name or ship name?
@@qtheplatypus I mean it works for both
plot twist: the little orange fan he was holding was actually spinning the whole time
It's been a really rough couple of days. Your content always brings me joy, and the cameo with Captain Disillusion was absolutely perfect. Thank you both.
Assuming you can not only manually set the framerate but also manually trigger capturing one frame, you could set a light sensor (that only looks directly up) on the roof of the helicopter and make the camera shoot a frame exactly as one blade passes over.
The youtube community Matt is in is the absolute best, smart people making the world smarter while having fun.
I was excited to see both Matt and The Captain posted a video today. Never did I expect a crossover event to occur. Awesome.
This is the best collab I can remember to date.
I wish I had this kind of enthusiasm about anything. Keep doing what you're doing Matt.
Honestly I think that bit at 6:51 is great. They're "almost" stopped. You've proven the point, and I actually think it's interesting to show that you can get any apparent speed you want, or reverse the direction, etc. That shot of the wagon at the beginning where the wheels were s pinning backwards was great too.
Nice work Matt. I thought I should mention the terms Nyquist rate and Nyquist Frequency for others to look into if they are curious. Something that some of us use in our day jobs.
This type of content is why I love RUclips. You've outdone yourself Matt.
He had already Exceled himself previously...
Leave your entries in the subreddit bros, and I'll watch submissions in the next episode of *LWIAY*
So this was shot with a global shutter camera? You could have mentioned that.
Thanks for the collab with Captain D! 👍
Actually it seems they didn't... the blades look pretty bendy to me, but I of course could be wrong.
He was instrumental in checking 3x60.
Yes I think you are right. It looked to me so similar to the camera the Captain used, so I thought they were they same. They really do bend. But the blades don't take up much vertical space, so it isn't that obvious.
@@LuLeBe don't*
@@LuLeBe The Sony CCD cameras all have global shutters. Some CMOS cameras like the PMW-F55 also have global shutters.
That is a seriously good camera, and so is the second one used for the helicopter footage. This video is by far and away the best quality on this channel....
I have been a fan of yours for a long time and I gotta say, that Captain Disillution cameo you did was AWESOME
From Tom Scott? You want 2:51.
It’s really cool learning how these camera situations happen and work
Your intro had some amazing product placements (speed cube, book refference, soccer ball, Taurus problem cup, and even the blades refference your rotoscoping shutter video)... AND a collab with Captain Disillusion!
Well done!
I have Caption Disillusions "Static Helicopter Blades" video right next to this one on my sub page! What a coincidence...?
Edit: And no coincidence at all. I should've known!
Just want to point out how badass a pilot Pauline is. Hovering is hard and one of the first things drilled into helicopter pilots is to get up to a decent altitude so they can recover or even autorotote (trade altitude for rotor speed) if there's a problem.
I would have guessed she was an ex-military pilot, and certainly not that she is someone who learned to fly a year ago. Wow.
Matt, you're so effusive! Loved it.
i love how you can see the reflection on the blades still! looked amazing!
MATT!!! Please make more videos like the ones you shot in New York and Chicago!!!! Those were the best ones!
Tri-blade inline stablizer, that's a really cool helicopter.
"Love with your heart. Use your head for everything else"
Got my head stuck in a blender. Instructions unclear!
Smh, use the new biomesh export feature
Matt's variation on a common saying:"If all you have is a head, everything becomes a maths problem."
You were gonna put your heart in the blender!?
Extremely effective collaboration promotion, especially in the time efficiency category.
I notice that Captain hasn't commented on your video, unlike you on his. I guess your relationship doesn't withstand the symmetric property of equality.
I find helicopters and any rotary winged aircraft fascinating. You can see the pitch changing slightly when the frame rates were matching
Just watching this video coming from the Captain’s channel. Love the 3B1B puzzle mug in the shot.
I've been watching you for ages and when I saw you in Captain Disillusion's video I fangirled for a minute!!
You know, I feel blessed by living in this era, with such challenges and resolutions for the usual physical phenomena that we encounter every single day without noticing it. Like, 20 years ago I wouldn't even imagine to witness an experiment like this one. And be one step closer to understand what the f** is this reality embedded in everything we ever experienced.
Your little scheme with Captain D worked. Subscribed.
I love both of you guys, Nice to see a small cameo.
Been a fan of your content anyway beforehand, but I saw the recent Captain D video and it reminded me to come over here and check for new videos again. Keep up the entertaining work ;)
Never thought the two channels that I love so much, that are highly niche and have nothing to do with one another would ever join forces. This is crazy
I remember when you made videos about excel, this is a nice step up (haven't seen your stuff in a while).
Normal RUclipsr: Hey we got access to a helicopter, let's do cool and crazy stuff!
Matt: Let's match the de framerate of a camera with the rotors!
You got to love this guy!
100 views? This channel is underrated by a lot!
Looks like we got on a early access video
(the sound effect made when something flies over your head)
Captain D got me here and I'm subbed to this channel now.
If you haven't you should totally check his Numberphile videos as well! They're hilarious and informative, just like the ones on this channel :)
In the early attempts you can see how the pitch of the blades rotate with the swash plate.
Another Parker square.
We don't get to 26.75 but we are almost there.
Came here from Captain Disillusion's channel. Never watched any of Matt's videos before but I instantly recognized the voice. He was on a podcast called The Badcast eons ago doing a whole bit on homeopathy. How about making a video on that, Matt? I loved the maths in that.
Kids love playing with helicopters 🚁
I loved that you shut down Captain D mid sentence for a change! Made me laugh out loud.
Itis also related to the sampling theorem, which says that you can only record frequencies lower than half of the sampling rate and all the other will just be moved to values between -fs/2 and fs/2 periodically.
A fun part of taking advantage of symmetry is that the object often isn’t perfectly symmetrical. Any blemishes would show up. Matt’s 4-bladed example is made of 2-blade props with an axial offset and generally lousy alignment. In the real helicopter, there’s only one scissor link alongside the mast betraying the true rotation.
But to do that you'd need a helicopter
"So I hired a helicopter"
I love this channel
Great video, thanks. It combines multiple passions of mine: Helicopters, math an technilogy. This effect is also know as "aliasing". This term is often used in digital signal processing.
It's funny how easily it happens by accident, but how hard it is to do deliberately. Thanks to all the team, for what must have been fun, but a lot of work.
I love that you can see the reflection in the stationary blade
So what you're saying is that it's probably easier to hire two helicopters, leave the lighter one turned off and hang it from the big one?
I think the patent on David Copperfield's rig has run out too if you wanted to make the wires really hard to see and stop the blades sagging.
Why limit to just rotations? The same effect can occur with any sort of movement. For example a camera on a train going past a fence where the framerate matches the bars in the fence as they pass by; it'll look like the fence is static or rolling along with the train.
I really like it when 'fault' is used with a non-negative connotation.
As an Australian, I can proudly say that the best camera trick we see here is fliping everything unupsidedown
that only takes one filter though, rotate 180° or flip vertical depending on whether there's writing in the video
Very very impressive. The thing that really caught my eye was the mirror like surface on the blades when in rotation. (See timestamps 4:17, 7:01 for examples).
At 3:16 you can see three broad triangular grey bands that slowly rotate, with a relief of three triangular bands that are completely transparent. Evidently the sum of multiple rotations yields a lower frequency pattern that is the sum of the higher frequency input. There's a more challenging maths problem.
Love the Cap. D outro!
Matt I just want to say your performance in Captain Disillusion’s video was breathtaking. Could you say 3 time 60 is 180 just once? That’d be brilliant, thanks!
Love the "gears" poster in the background ;)
Captain D is my hero.
2 of my favorite youtubers collabing... today is a good day
Nice Collab with the captain!
Brute force method: run the camera at very very high frame rate and then just pick the frames where the blades are in about the same spot each time.
Thank you for including that mug in-frame, finally a surface on which it can be solved.
So to do that, we needed to hire a helicopter.
So I hired a helicopter!
For those of you that scroll this far down, here's something cool and really nerdy:
The more complicated explaination of what's going on here is explained mathematically by the Nyquist-Shannon sampling theorum. In layman's terms, your "frame rate" (sampling rate) can only correctly capture spinning things with HALF of that "frame rate" (frequency). Everything above "half your frame rate" gets mapped to a lower frequency and looks wrong. This also applies to audio signals and a bunch of other cool things!
If you made it this far, I hope you learned something cool :D
Haha, loved the Cap D bit ! Matt,Helicopters, Math, the Cap - ingredients to a great vid.
What is going on here? A Standupmaths Production - Michael Bay style!
Weird crossover but I'm into it
The Captain Disillusion outro was the icing on the cake.
I'm sure someone else already pointed it out, but 26.75FPS was the MAX FPS that would have worked. Going to 52 picked up the blades at half points. What you needed were multiples of the Inverse of the FPS. The SPF (Seconds Per Frame) if you will. You needed multiples of the period, not the frequency. Super common to mix up periods and frequency.
This crossovers with CD are great :) greetings from Poland :)
Great video / cool topic. And a surprise collab with Captain D to boot!
I dream of having a job so that I, too, can be a Patreon supporter of such vids. Thanks to you all! This was belting fun!
Fun fact: helicopter blades rotate at constant speed and they adjust the lift they produce by adjusting the angle of the blades.
So even when they've landed the blades still spin at full speed.
I used to believe they went up and down using the throttle.
Which is actually what toy helicopters and quadcopters do.
2017 Matt: I've just bought a propeller, it cost me less than ten pounds and I could do exactly the same thing with this
2019 Matt: *SO I HIRED A HELICOPTER!*
I like Captain D, I like his guests, I liked this video
Wow never been this early for a video by a big channel before - cheers Captain D!
Even with the slow moving blades, it proves the point. But the speed of rotation is also changed by the strain put on the blades. So going up will slow it down a bit, and rotating the tail will also change it. ^_*
Wow I was just wondering about this!
Thanks Matt!
I remember this from my high-school science class. And Mr. Wizard's World. It's a good experiment, made better with just the right amount of math and helicopters.