Helicopter Physics Series - #3 Upside Down Flying With High Speed Video - Smarter Every Day 47
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- Опубліковано 28 вер 2024
- I would appreciate it if you share this by clicking here: on. Upside... . Sorry about the Ad, I'm saving for the kid's college education and this is my plan to pay for it. There's more to Chopper Physics than you think. I will be releasing the videos at the end of the video over the next few weeks.
Tweet questions/comments to me personally @SmarterUA-cam
MUSIC "It's probably going to be OK" created by "A Shell In The Pit" Download it here: ashellinthepit....
You can actually rent a Phantom if you have something to research or you just want to have fun. Use this form and tell them Smarter Every Day sent you! bit.ly/wQPlHd
The wizard pilot is Carl Groover www.carlgroover...
Carl Flies for the Curtis Youngblood team bit.ly/w2ATpl
Carl's UA-cam channel is here: bit.ly/yqgP12
Sarah Xu created the awesome time-lapse intro.
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Get Smarter Section
Want to learn more and get lost on Wikipedia?
The Rolling Shutter Effect
en.wikipedia.or...
Similitude (How Engineers determine the dimensions of wind tunnel models)
bit.ly/SIMILITUDE
For you hardcore RC enthusiasts who want to stick to the RC term for CCPM (3 servo swashplate control)
en.wikipedia.or...
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Just for fun: Where I get T-Shirts when I go to Destin
harvesthosannad...
Instead of saving for my kids' college, I make videos using the money I would have saved.
The thought is it will help educate the world as a whole, and one day generate enough revenue to pay for their education. Until then if you appreciate what you've learned in this video and the effort that went in to it, please share the video. If you REALLY liked it, feel free to pitch a few dollars towards their college fund by clicking here:
bit.ly/KidsCollege
Warm Regards,
Destin
I don't know of one single course that can cover "aerospace physics". I spent 10 years studying it and still feel like I've only scratched the surface. My advice would be to take the course, but recognize you won't know everything when you're done. I learn something every day. My other advice would be to tell your friends to subscribe here for my own personal gain.
(using meat servos to type on keyboard) Yes. Meat Servos.
Meat Servo!
That made my night... well played good sir
you took my comment
The last video in this Playlist was crazy! I don't think I've ever REwatched a clip so many times. Crazy you can even see the pilot almost come out of the cockpit, even his mic and muffs were dangling. Thank God he survived. Thanks for more awesome videos Destin!
I just took my kids down to Destin Florida one week ago ! The beach is amazing ......every one was outside jogging or riding bikes and walking down the Beach . I have never been to a more beautiful place . :)
Heck yeah. It's hard to wrap your head around but once you get it it makes a lot of sense.
Just a note about "anti-torque pitch control": Technically, pitch is rotation around the port-starboard axis, so it'd should be referred to as "anti-torque yaw control."
Destin, you have now received the biggest thumgs up ever recorded in human history. I admire you for standing by your principles it's something I thought was gone from society! GOOD JOB!!!
When Destin mentions rolling shutter at 1:43, then finishes making a video about it 5 years later. It's cool to see that the germ of an idea was already planted here in 2012.
Blackhawk pilots have a common prank they play on new guys. On long hauls, if a newbie has to pee, they'll land on the ground and let him exit the aircraft and walk halfway back, face the tail, and begin to pee. Once he starts, the trick is to feather the collective to slightly negative, reversing airflow and making his pee stream rise up over the urinator's head.
I hope you guys become the most intelligent group of chopper students EVER.
Absolutely awesome idea fixing the go-pro to look at the swash plate. Makes understanding it in depth and intuitively so much more easier. Love your videos :)
everytime i watch some video of this guy, the songs combined to the images make me think about how our world is wonderful!
A thing about controlling different vehicles which always interested me as a computer scientist is that it's one of the few computational tasks that humans perform way better than modern computers.
Do what you love man.
Glad I went back and watched part two again - was able to properly comprehend the natures of (and differences between) collective and cyclic pitch and thereby understood and enjoyed this episode much more clearly!
It still seems that the wheels are moving backwards or not at all in modern commercials. Thank you physics for being able to explain things. :D
I think it's amazing just how much care you take in your videos, especially to make sure your audience understands what it is you're explaining. You don't see so much effort these days and it's refreshing to see in your videos.
The swashplate movements during the tic-tocs were insane!
The blades push air down not only because of the direction they spin but also because of the pitch (angle) of the blades. When the pilot flips the heli upside down, he also reverses the angle of the blades so that they push air the other way.
Howdy, musician here. The tracks featured are "It's Probably Gonna Be OK" and you can find links in the video description. Thanks for asking!
You know, Destin, I've got to tell you something. I've been on a media fast (i.e. no "Media" at all, movies, tv, youtube, etc.) as a personal test. You know what I found out? Not only was your channel the only one I missed, but it's the only one I still enjoy. Why? Because I ACTUALLY LEARN SOMETHING!! :D Please keep up the good work! It's like I'm being "Homeschooled" by watching. lol (at home, watching YT, learning things. Who would've thunk it.) Many thanks!
So old but still so good!
this guy will nail QWOP!
loving the helicopter videos
I had a USMC roommate who swore against helicopters. Told me ever hour of flight cost 2 in repairs. Now i see why.
Great series, though.
Much love!
you guys are TOP NOTCH! Tremendous explanation. really a primer on the swash plate!
Hands Down, the best series on UA-cam yet!!
The speed of the blades if the helicopter never moved would more or less stay the same. As the helicopter maneuvers and the pitch and collective change (usually more collective in this case), the changing amount of drag caused by the angle of the collective will cause the blades to either slow down or speed up. Basically, blade drag influences rotor rpm when power is constant.
man where were you 6 years ago in advanced aerodynamics! this would have helped save a good half a semester!
Beautiful little part of murca
I live in DESTIN! Haha! It's a small touristy beach resort town off the Gulf of Mexico in Florida. Lot's of tourist! It's got great beautiful views, but a lot of unintelligent people. Love your videos btw!
Human knowledge blows my mind... I watch this to try to pick up some of it.
wingman is right, consider that the blades are going in a circle around the swashplate. as long as the contact plates slide along each other on the swashplate there is no limit to the number of blades you can attach to the top and as long as they are all attached to the swashplate the same way they will all behave the same way at the same location around the rotorshaft
scared the crap out of me, and when it played again i noticed the pilot flinging outside of the chopper
Even though the image itself was analogue, the video still worked by capturing discrete individual frames, ie digitally sampled in time. This allowed for Temporal Aliasing. And it's what, I think, caused the wagon wheel's effect you're talking about.
You're so happy and so intelligent. Gimme a piece of happyness please!
The blades on the helicopter rotate, which changes their pitch. This allows the helicopter to move up and down, when the blades are angled so that air goes underneath them and bounces off, you get upward lift. When rotated the opposite direction the blades undercut the air and forces it upward causing the helicopter to go down. When the helicopter is inverted it's the same thing, except inverted. The angle that causes descent when right side up causes lift in inversion.
the videos are awesome, this Deep Dive is so cool!!!!! The music you use is perfect too!!!
There are actually smaller helicopters that are not supposed to fly in 3d figures like the one in the video. These ones lift by rotating faster, but the shape of the blade is different then. koaxial helicopters for example are always lifting by controlling the turning speed of the blades. Greetings from Germany ;)
And of course i want to greet you too Destin. Nice work there.
Good work, very easy to understand to people who didn't know this already.
So I noticed a lot of people talking, on the aliasing link especially, about the human eye's perception on moving object/s, particularly about the rotation of car wheels and how they appear to stop and move backward. I think that would be a great topic to explain on a future video!
i agree, you could have your own show man!!
i really liked how u referred to another video that explains that term and that i could simply click and watch :D. thx, great channel
Man. I LOVE You! PLEASE PLEASE PLEASE upload videos more often I learn SOOO much from Yyou.
I can't claim to really understand all of this, but it's still awesome.
Amazing that the helicopter can still fly with the camera.
The helicopter was drawn by Sarah Xu, a student at Vancouver Film School. Google her for more great little animations.
im not so sure, im pretty sure bernoulli's theory still applies because the stagnation point moves below the apex of the leading edge as the angle of attack is increased. as long as the airfoil hasn't stalled, bernoulli's theory is still in effect.
Hell yeah been waiting anxiously for more of this
Please revisit this series with the level of detail and quality of videos you make today. :)
RC helicopters are either electric powered or fuel powered with a "CLUNK TANK". This tank continues to provide fuel at any angle including inverted. Full scale helicopters don't have this and in inverted flight the engine stops from lack of fuel and it plummets. :)
Pensacola FL
FTW!
The new youtube layout still sucks, it keeps hiding all your videos on me. Which is depressing because I highly enjoy them! Keep doing what you, and the others, are doing! You're helping make the world a better, smarter place.
you explain things and edit your videos very well. i hope you get a trillion subscribers. :)
The best way to make a good video is to make many bad ones first. I feel like I should chisel that in stone or something.
Did you know that the early western movies have the wagon wheels appear to go backwards or stop when they filmed them? They did not even have aliasing then because it was good old analogue film. The reason your rotor blades appear to stop is because the frame rate of the camera matched a multiple of the rotor speed. Aliasing in an effect that has to do with the rasterization of a progressive scan video and is responsible for the bent look of the blades.
Sure. I do it all the time some areas we are allowed to do it others we are not. We make sure and fly a safe distance from sky scrapers while flying by them.
Destin, this channel is simply the best on UA-cam. I love you man! :)
that helicopter in the intro is amazing!! did you draw it?
The speed of the rotors would alter a bit from the drag, right? Like if you pull the pitch hard, it's going to be pushing a lot of air, which would strain the engine and slow the revolutions a little.
I love it when you bust out the engineering terms i havent heard since class. there is another factor that most choppers dont have designed into them that doesnt have to do with similitude and thats the fact that most rotor blades are only designed to take the force (and consequently stress) in one direction. because of fatigue and other reasons. this is since they have to lift several thousand lbs instead of the 1-10 lbs the RC chopper blades need to lift.
yea, any helicopter can invert. recovering is the issue.
i meant sustain inverted flight. a roll and flips are nice, but that is not sustaining flight upside down (because even on that helicopter, there is no way to input negative collective into the flight controls)
Good videos and good choice with the music, Des.
As you increase blade pitch, you increase drag which momentarily decreases rotor rpm. The helicopter motor compensates for this decrease by adding a little bit of throttle to maintain constant speed, but there is a little bit of lag in this process. When you see him accelerate quickly (adding pitch quickly) you can hear the motor sound momentarily decrease, and, as expected, you "see" the associated aliasing.
Aww, what a great dad!
Read the first few lines of description! :)
That guy is really good with an R/C helicopter. Wow.
Click the box at 1:56
This guy is an impressive driver!
This was poetic.
its because of people like you that the USA is such a great country.
Great song man. Keep up the good work.
Hey Detinws2!! Your videos are now on Reddit, thanks to me! (well, not all of them..I'm posting one at a time.) But hopefully it'll get the Reddit community involved, which will link more to your UA-cam page! Woot woot!
Anywho, love this episode... longer, more technical, great shots. True Mythbusters style, good job! Keep it up! When I saw there was another episode up, I ran to my girlfriend and we both sat down to watch it!
Robert, even old films are subject to aliasing because they are made using 24 stills per second. Imagine a wagon wheel with 24 spokes. The stunt man drives the horses so that the wheel rotates precisely once every second. Between every still frame the wheel advances precisely by one spoke, so all the stills look the same and the wheel appears not to turn. If the stunt man slows just a bit, the wheel advances a bit less than one spoke per frame and the wheel looks like it's going backwards. :-)
Wow that was amazing!! I loved the on board views. Thank you for that Destin!
Absolutely fascinating! Thanks for posting.
The Lynx helicopter is, I believe, the only full scale helicopter to properly be able to fly upside down, and it wasn't even designed for that.
Thanks for this Channel
no. because the counter rotating blades aren't actually at the same cyclic or collective pitches. after the air passes through the upper blade it has a downward component of velocity, then the next set of blades need a higher collective pitch to then have the same lifting effect. as for them both being at an angle, the blades are always at an opposite angle to each other on either side of the axle. if you were to attach a camera to the tip of a blade, it would shimmy left and right as it spun
i know, i read that part too. i think that's really cool. keep it up!!
To generate normal lift you pull the swashplate down to get the blades to direct air downward, but if it's upside down you push the swashplate up to get the blades to direct air downward. If the helicopter were sitting on the ground, it would be pushing air up, but since it's upside down, it keeps it aloft. (Right?) Needless to say, pulling that trick off is *hard*.
i verified my information with several hh60g FCF pilots, as well as flight control rigging mechanics. a retreating blade on a 60 may momentarily have negative pitch... but on a hh60g model, for sure, it is impossible for a pilot to input negative collective.
Meat Servo. MEAT SERVO!
That term, in and of itself, is deserving of several extra likes, and possibly a beer the next time I'm up yonder (I live outside Atlanta, and have been promising myself a trip to NASA Huntsville for the better part of 20 years now).
Very, very cool footage.
Another reason for no, is that if you were to try to do something like a barrel roll or fly upside down in a real helicopter not made for that is you will completely mess up the engine. Like complete overhaul after you land it.
your the nicest person on youtube
this is awesome!! thank you!!
Awesome... you've just created a homemade UAV. Now combine the scale-heli with a homemade small-scale TOW to create a crow removal system (CRS). ATGMs Rule!
how is the helicopter powered? is it on gasoline or is it electric?
great video as usual btw
How does a helicopter hold its self upside-down, iv always be told, that the rotors create DOWN force, so shurley- when the helicopter is upside down, its pushing itself in the ground, Destin, Please help!
Really great video. Good job!
Oh, and a link to your preferred definition of Aliasing would be useful too. ;-)
That curved blade is so trippy
this guy should be a drone pilot for the army :P
Meat Servo!! Hahaha I loved it
Thank you. It’s nice.
What camera do you use to film such great videos and have such good slow-motion
Awesome video man, a friend on facebook showed me this and Im so glad he did!
Due to gyroscopic precession, if the helicopter went upside down, wouldnt the angular momentum be pointing towards the ground? The rotation of the rotors would have to be flipped for the angular momentum to still be going upward, right?
Your series is very good for explaining basics. I feel that you could have gone one step better to ensure your audience understands the difference between toys and the real thing. It's important to point out the difference between a hobbyist's 'toy' helicopter and a real one. There is no commercial two-bladed under-slung system available that can fly upside down, to my knowledge, as no "negative pitch" mechanism exists that will permit the rotor system to go into such pitch angles. Multi-blade articulated rotor systems are the same, for virtually 99.9% of all commercially flying helicopters. Yes, one or two of the "Red Bull demonstrators" are aerobatic, but have been specially constructed with multi-blade articulated rotor systems for just that purpose. I've even seen an old black and white demonstration video taken many decades ago (1950's) of a person doing low-level loops in a three-bladed fully articulated system...very dangerous. Some military gunships (AH-64 comes to mind) are capable of some aerobatics (not when fully armed due to weight), and I can assure all readers that an upside-down function is NOT included in their military flight training. I flew UH-1H troop carriers, "C" model Huey gunships, and the sleek AH-1G Cobra gunship, amassing 1,955 hours of combat time. While I can state from personal experience that we put those aircraft right on the line for their fullest flight capabilities, flying 'upside down' or doing any of the flight tricks seen in your videos was not on the list. Any attempt to permit any one of those helicopters to achieve negative weight on the rotor system would result in mast bumping and shearing the rotor system off the mast. Unfortunately, I have actually been a witness to two occurrences of that phenomenon in combat. JCH, Colonel, USA (Ret).
The relation to 'real' flight is irrelevant though, the theory is the same whether inverted or normal, cyclic control for lateral movement is the same, just forward, reverse and tail authority are reversed. As for helicopters having negative pitch, the Westland Lynx is able to use up to (i believe) 5 degrees negative pitch, it has a semi rigid rotor head for this purpose.