Love these old docs. No silly music. Just straight up, well presented facts with no dramatisation or wow factor in the voice of the narrator like you often find these days.
True. In a way I often think those old guys had the ability to teach better with those technologies than today's youtubers with this generation's graphic skills probably because those videos were made or supervised by actual technical professionals.
Created by the RAF’s Tucano Course Design Team, based at RAF Scampton. Sqn Ldr Pete Dummer and Wg Cdr Pete Stannard were the brains behind it and came up with the storyboard. I did all the boring start up and taxi stuff for the film crew. Pete Dummer and I did the flying sequences. These were filmed from the back of a Hercules over the Vale of Evesham. The animations were fantastically expensive to do way back then!
I did my bachelor's in mechanical engineering and have decided to step up my game to aerospace engineering and find myself confronted with a tonne of kowledge gaps and lack of intuition in a lot of concepts my peers take for granted. Seeing that little animation at 4:26 just made everything fall into place beautifully.
Probably the best video/documentary which explains various aspect of a propeller with interesting historical facts. The best part is the animation which explains propeller stuffs in the best possible way. Thanks a lot team!!
I at this moment I can only say THANK YOU ! Such clarity.. Straight to point...no stupid act no bullshits only pure info right on the track from start till end ! I love you !
The best propeller subject I have ever watched! I am doing my CFI and this is going to be with all my students now! Love and really enjoyed! Thank you!
There are no better educational aids than these old school instructional videos. This was tremendously helpful in helping me understand propeller principles. Thank you!
One of the most informative videos out there about an extremely large amount of aspects of a propeller. It explains many concepts, and does it using a method that is easy to understand, but informative at the same time. It does not bore you with unnecessary information. It provides interesting facts to make the learning more immersive and uses a chronological order as an attempt to make the information make more sense, be easier to understand. I recommend this video to everyone who even has a mild interest in aerodynamics or airplanes in general, and even if you don't, I still recommend you give it a watch.
I am doing my degree at the moment in AME (Aircraft Maintenance Engineering) and this video helped me a lot to understand the principal of propellers and the different stresses forces acting on them.
Wow. I have no aviation experience other than youtube binge-watching, and I watched each bit 10 times over before I understood the diagrams, and now I feel like I read an entire textbook on the subject in this video. Absolutely amazing production and visualisation! Best use of my time today.
This is really a fantastic overview of how a propeller works and why and they do what they do. The most helpful part of this video is the explanation of p-factor (which here is called asymmetric blade effect) that starts at 19:03. The film talks about p-factor only affecting tail-wheel airplanes during take off and that is correct about takeoffs. However any general aviation single propeller aircraft can be affected in flight by the leftward tendencies induced by p-factor when propeller axis is above the direction of flight then there will be some p-factor and will be most strongly induced during low airspeed with high pitch angle such as during initial Vx climb.
I'm studying for my commercial pilot's license and this video explained the operation of a constant speed propeller in such a way that I know fully understand how it works lol
As others have said what a fantastically clear documentay, today's content producers could learn so much from this, content is key, not thumping background noise. By the way any idea who the narrator is? Many thanks to all concernd in making this piece.
I am now at 6th minute but I couldn't hold myself to wait till end; this explanations and illustrations are AMAZING. Thank you so much for this upload.. Regards
The angle of attack of a propeller blade is generally measured at a point that’s 3/4’s of the way from the hub to the tip. The blade is usually widest at that point and it’s where most of the thrust is produced. To calculate the angle of attack, divide the pitch by the diameter and then divide by 2.36. The result will be the tangent of the angle. Use the arc tangent function to convert it to degrees. For a 69x50 prop, it would be 50/69/2.36=0.30705 and atan(0.30705)=17.069 degrees. The 2.36 is 3/4’s of pi..
Props should push - because of the Bernoulli effect: the air the accelerate forms a narrow tube behind them, which is fed from a "fanned out" incoming cone of low-pressure; so sticking the fuselage in the way of the output is the worst possible thing you can do (reduces efficiency and exponentially increases friction), whereas putting it in front instead is doubly more efficient (reduced friction, since the air is already being drawn in from a wider angle). The missed out discussing airfoil sections and the reynolds number: the shape of the blade root near the hub, verses the midsection, versus the tips, is all dramatically different. They also forgot to talk about induced drag - the vortices at the blade tips where the high-pressure underside air rushes in to take the place of the low-pressure topside air: if you hold a bit of string at the side of a moving propeller, you will find the air is blowing the *opposite* direction to what you might think!
anyone remember the aviation documentary series from the late 1980's called reaching for the skies? The reason I ask is because that series used to have the very loud sounds from the library footage - just like this does. And the narrator sounds familiar.
I'm interested in flying but this just flipped my brain upside down... .-. I'm gonna have to get a notebook and watch this like four more times to understand the logic lol.
Sk8boarder1700 please keep skateboarding and don't consider flying... this is BASICS of prop ops. If you don't understand this concept, good luck with the more complex aerodynamics....
Alexandre Reber When I watched this it was like 4am chill out dude. Anyone can talk shit over the internet just shows how petty you are over a UA-cam video lol
Don't worry. This is more for people who are into designing aircraft. You just need an overview if you want to simply fly. Go learn to fly and have fun. Don't listen to people here yu say otherwise. They probably have not designed a single aircraft in their life but want to feel superior by putting others down
While this demo is cool at 6:16 got me confused. I think what he meant say is at tip of the propeller the airflow is higher than at hub so the tip stall before the prop at hub.
16:41 I never considered before that the Centripetal (centrafugal) force would have a tangential component. 👍 What is interesting is that they draw the CF vectors thru the leading and trailing edges and not thru the cg of the whole blade. That would produce no CF torque. 🤔 That CF is distributed along the width of the blade isn't it.
Wow! I echo all comments below! REALLY informative, done so in a way that is understood. Plus, it is a 24 minute video. If one doesn't get it all the first time, play it again. Play it again after that. It is called learning and there is nothing wrong with that. Any teacher would be glad to have students cover things as many times as they need to 'get something right'. All the explanations of why and how a prop works, its performance aspects and what to watch for, some variables and even a bit of how it affects the aircraft itself during take off. We even get a bit of history of the prop, how it came to be and the changes along the way to the props we have today. Brilliant! There needs to be a library of just such videos as this one, covering different topics with aeroflight. There are some videos out for sure, not sure they are of the same caliber as this one, but I am sure they cover well. Once again, superb!
Well here it all is, how about that, probably the first time I've felt the need to pause a video while writing a comment for said video. I've often said, " we've forgotten more than we've learned in the past 100 years" and brother have we learned a lot.
Wow, the way the oldies explain aviation related information is much more clear! Does anyone know who made this lesson and where I can find more of them?
Well if it had covered some animations on the pitch governor and adjusting pitch, this would have pretty much covered anything a pilot would need to know about propellers.
Well, if I wasn't understanding very well propeller pitch control and rpm, now I'm completely baffled... I'll need to watch this over and over again... :)
Wow this is a great video explanation thank you for posting this !! I had such hard time understanding aoa in relation to flight, this helped so much! 💥👍🏼😀🙏🏼🙏🏼🙏🏼
6:11 I get that the tip of the propeller moves faster than the base but I still could not wrap my head around why the angle of attack would increase at the tip when it is visibly uniform from base to tip. He said "the angle of attack would increase" how so?
From the standpoint of the propeller section (tip or hub), there are two vector "components" of airflow. The larger is airflow resulting from the prop rotating through the air. It will be in a direction flowing toward the flat, high pressure side of the prop airfoil. The lesser airflow is due to the forward motion of the prop (and plane) forward through the air and induced flow. This will be at 90 degrees to the airflow due to just prop rotation. Its direction will be toward the curved, low pressure side of the prop airfoil. The actual airflow is the vector sum of these two components, and its ultimate direction (angle of attack as the video calls it) will depend on the relative velocities of the two "flows". The forward lesser component will be the same for prop sections at the tip, and toward the hub. Let's say for clarity both prop sections are angled at 45 degrees to rotation. And lets further say that at a prop section half way toward the hub is experiencing a forward airflow velocity that EQUALS the rotational velocity there. A little quad rule napkin sketching will show that the resulting total airflow will strike the 45 degree prop section squarely on the nose, for an effectively ZERO angle of attack. Now lets move out to the tip. The forward airflow is the same, but since the tip is twice as far from the hub, its rotational velocity, and the airflow that causes is now TWICE what the forward flow is. Going back to the quad ruled napkin will show that the resulting combined vector will now strike the 45 degree prop, not on the nose, but on the high pressure side of the prop section at about 20 degrees. This equates to a 20 degree angle of attack at the tip, while half way toward the hub the constant 45 degree pitch prop is experiencing a zero degree angle of attack. It is important to remember that angle of attack refers to an airfoils orientation regarding the media it is flowing through, not necessarily the same as its orientation to vertical, horizontal, or even the craft it is attached to.
@@NullHand thanks, now that you explained this clearly. I am now completely lost hahaha. I'm going to read this many times, I think I got a little more understanding now.
Love these old docs. No silly music. Just straight up, well presented facts with no dramatisation or wow factor in the voice of the narrator like you often find these days.
God, the graphics here are so cool. I love those old wireframe-laser graphics.
True.
In a way I often think those old guys had the ability to teach better with those technologies than today's youtubers with this generation's graphic skills probably because those videos were made or supervised by actual technical professionals.
Yes, these are incredible. How were these graphics designed/made at the time?
Created by the RAF’s Tucano Course Design Team, based at RAF Scampton. Sqn Ldr Pete Dummer and Wg Cdr Pete Stannard were the brains behind it and came up with the storyboard. I did all the boring start up and taxi stuff for the film crew. Pete Dummer and I did the flying sequences. These were filmed from the back of a Hercules over the Vale of Evesham. The animations were fantastically expensive to do way back then!
Is it a series available for download? I'm a physics student. And this stuff is gold
Really miss this kind of graphs today. They really helped me to understand a phenomena that I couldn't understand watching modern videos.
Thanks a lot for this
Badass!! Thank you!
One of the best overviews of propellers I've ever seen. Thank you for your work!
I did my bachelor's in mechanical engineering and have decided to step up my game to aerospace engineering and find myself confronted with a tonne of kowledge gaps and lack of intuition in a lot of concepts my peers take for granted. Seeing that little animation at 4:26 just made everything fall into place beautifully.
could i fly your plane
@@Iugeer don't see why not
Probably the best video/documentary which explains various aspect of a propeller with interesting historical facts. The best part is the animation which explains propeller stuffs in the best possible way. Thanks a lot team!!
I at this moment I can only say THANK YOU ! Such clarity.. Straight to point...no stupid act no bullshits only pure info right on the track from start till end ! I love you !
And no annoying music!
The best propeller subject I have ever watched! I am doing my CFI and this is going to be with all my students now! Love and really enjoyed! Thank you!
Ma'am can you give your mail id?
There are no better educational aids than these old school instructional videos. This was tremendously helpful in helping me understand propeller principles. Thank you!
One of the most informative videos out there about an extremely large amount of aspects of a propeller. It explains many concepts, and does it using a method that is easy to understand, but informative at the same time. It does not bore you with unnecessary information. It provides interesting facts to make the learning more immersive and uses a chronological order as an attempt to make the information make more sense, be easier to understand. I recommend this video to everyone who even has a mild interest in aerodynamics or airplanes in general, and even if you don't, I still recommend you give it a watch.
I am doing my degree at the moment in AME (Aircraft Maintenance Engineering) and this video helped me a lot to understand the principal of propellers and the different stresses forces acting on them.
Where are you working brother?
i watched this four times. Full of information Great salute to Mr.DAVID and the Engineer who developed this video.
Wow. I have no aviation experience other than youtube binge-watching, and I watched each bit 10 times over before I understood the diagrams, and now I feel like I read an entire textbook on the subject in this video. Absolutely amazing production and visualisation! Best use of my time today.
now you can study it for real
Excellent. I had to watch it a few times to understand it.
Sorry, if were so well explained, WE wouldn´t need to watch it 100 times more.
@@andrerovigatti9997 That's like blaming your teacher because he didn't teach you well enough so you didn't have to study for exams.
I wondered who would be the first to admit that.
@@ThomassoCZ THIS
@6:10 why does the angle of attack increase at the tip, thus requiring a twist? Is this increase caused by the larger relarive air flow?
So many lectures have been consolidated in single lecture.
Exemples are attractive.
Wow! This was so informative. I wish modern documentaries were like this. so much information thoroughly explained in a short video.
This is really a fantastic overview of how a propeller works and why and they do what they do. The most helpful part of this video is the explanation of p-factor (which here is called asymmetric blade effect) that starts at 19:03. The film talks about p-factor only affecting tail-wheel airplanes during take off and that is correct about takeoffs. However any general aviation single propeller aircraft can be affected in flight by the leftward tendencies induced by p-factor when propeller axis is above the direction of flight then there will be some p-factor and will be most strongly induced during low airspeed with high pitch angle such as during initial Vx climb.
i can't believe one of the Wright brothers is still alive. we're fortunate to have this explanation straight from the source.
One of the simplest explanations. Thanks for uploading!
Outstanding guide to how propellers work and why. Thanks for this.
Outstanding ! Ton of information in only 24 minutes and very enjoyable to watch
The explanation of p-factor is exquisite in its clarity.
Absolutely beautiful documentary. Thanks
Thirty three years on, is there a modern version of this film?
This is brilliantly presented. Now I really should study for my english exam tomorrow.
I'm studying for my commercial pilot's license and this video explained the operation of a constant speed propeller in such a way that I know fully understand how it works lol
What an explanation!!! Very visual (and clear) about the variable pitch influence.
This video is a treasure! Thanks!
As others have said what a fantastically clear documentay, today's content producers could learn so much from this, content is key, not thumping background noise. By the way any idea who the narrator is?
Many thanks to all concernd in making this piece.
This video documentary has propelled me to new heights. I've been spiralling in circles with them for years since learning to fly! - Well Done....
Roland , you're spiraling alright , and teetering hahaha just kidding
Sucha freaking informative vid... literally got so much to understand and knw in just one video
Wow! Very informative, clear explanations. I never realized that there are so many forces acting on a prop !
wait for helicopter main and tail rotor forces explanation
I am now at 6th minute but I couldn't hold myself to wait till end; this explanations and illustrations are AMAZING. Thank you so much for this upload.. Regards
One word: BRILLIANT!!!
Thank you.
Salute to "DAVID WRIGHT SIR"
You are a legend😍😍😍
Iam a mechanical engineer and it is very helpful to me.
Tq sir
David! Tahnks a lot! Got this as an edited Facebook video, I am pleased to find it at UA-cam, and complete! Impressive video!
Very clean and comprehensive explanation with good narration and graphics.
dayummmmmmmm
Where are more videos like this one? I'll watch all of them!
The angle of attack of a propeller blade is generally measured at a point that’s 3/4’s of the way from the hub to the tip. The blade is usually widest at that point and it’s where most of the thrust is produced. To calculate the angle of attack, divide the pitch by the diameter and then divide by 2.36. The result will be the tangent of the angle. Use the arc tangent function to convert it to degrees. For a 69x50 prop, it would be 50/69/2.36=0.30705 and atan(0.30705)=17.069 degrees. The 2.36 is 3/4’s of pi..
Awesome, old explainations are the best
0:11 Wright invented the 1st usable plane and the 1st Aircraft carrier launch system, what a smart bros.
Also: first cruise missile was built on basis of their aircraft.
Props should push - because of the Bernoulli effect: the air the accelerate forms a narrow tube behind them, which is fed from a "fanned out" incoming cone of low-pressure; so sticking the fuselage in the way of the output is the worst possible thing you can do (reduces efficiency and exponentially increases friction), whereas putting it in front instead is doubly more efficient (reduced friction, since the air is already being drawn in from a wider angle).
The missed out discussing airfoil sections and the reynolds number: the shape of the blade root near the hub, verses the midsection, versus the tips, is all dramatically different. They also forgot to talk about induced drag - the vortices at the blade tips where the high-pressure underside air rushes in to take the place of the low-pressure topside air: if you hold a bit of string at the side of a moving propeller, you will find the air is blowing the *opposite* direction to what you might think!
Very informative and interesting as well. Thank you for posting.
The Animation is gorgeous😍
A beautiful feat of practical engineering. hats off to those genius pioneering brains that made it possible for us to have what we have today.
Great explanation. Even my CFI said he had trouble relating to the changes in pitch til they were compared to car gears.
WHAT A GOOD DOCUMENTARY WELL PREPARED
Holy detail!!!!!!!! that was a lot to cover!!
Nice work, this really helped fill in gaps.
This is an excellent, concise explanation.
The best video I have ever watched on propellers
Thanks for uploading this.
Until watching this, I didn't realize how critical an understanding of the propeller, in relation to all of aviation, was.
Much appreciated. Just great.
Thanks i learn alot ,now i can go back to my model drawing board and decide what i want to achieve for flight...
Yeah, did you
Thx a lot for an excellent technical video. It answered many of my questions and more! Cheers!
Im studying aircraft maintenance
this helps me a lot because it is a video and not written only in a book
Why was the Cessna pilot sweating?
His fan stopped working.
HA!
that was actually funny
😂😂😂
lmaoooo that little fan
anyone remember the aviation documentary series from the late 1980's called reaching for the skies? The reason I ask is because that series used to have the very loud sounds from the library footage - just like this does. And the narrator sounds familiar.
When a super old documentary teach you way more than anything new that you can find.
best video which explains various aspect of a propeller
Thanks a lot for the video David!
I'm interested in flying but this just flipped my brain upside down... .-. I'm gonna have to get a notebook and watch this like four more times to understand the logic lol.
Sk8boarder1700 please keep skateboarding and don't consider flying... this is BASICS of prop ops. If you don't understand this concept, good luck with the more complex aerodynamics....
Alexandre Reber bruh, no need to be a dick. I'm sure he'll get it. People learn differently.
Alexandre Reber When I watched this it was like 4am chill out dude. Anyone can talk shit over the internet just shows how petty you are over a UA-cam video lol
Don't worry. This is more for people who are into designing aircraft. You just need an overview if you want to simply fly. Go learn to fly and have fun. Don't listen to people here yu say otherwise. They probably have not designed a single aircraft in their life but want to feel superior by putting others down
Sorry, if were so well explained, WE wouldn´t need to watch it 100 times more !
Sir please continue these which will help me develop my business in India
While this demo is cool at 6:16 got me confused. I think what he meant say is at tip of the propeller the airflow is higher than at hub so the tip stall before the prop at hub.
Yep was thinking about this..
Hello all,
I would like to know if there are any formulas to predict the aerodynamic and the centrifugal twisting force (min. 17:16)
16:41 I never considered before that the Centripetal (centrafugal) force would have a tangential component. 👍 What is interesting is that they draw the CF vectors thru the leading and trailing edges and not thru the cg of the whole blade. That would produce no CF torque. 🤔 That CF is distributed along the width of the blade isn't it.
Thankyou for this video. I really enjoyed it.
Wow! I echo all comments below! REALLY informative, done so in a way that is understood. Plus, it is a 24 minute video. If one doesn't get it all the first time, play it again. Play it again after that. It is called learning and there is nothing wrong with that. Any teacher would be glad to have students cover things as many times as they need to 'get something right'. All the explanations of why and how a prop works, its performance aspects and what to watch for, some variables and even a bit of how it affects the aircraft itself during take off. We even get a bit of history of the prop, how it came to be and the changes along the way to the props we have today. Brilliant! There needs to be a library of just such videos as this one, covering different topics with aeroflight. There are some videos out for sure, not sure they are of the same caliber as this one, but I am sure they cover well. Once again, superb!
Its a lot to take in. But it's all the info crammed in. Thanks a million. Answered all my questions.. Thanks
The opening song is my new favorite song. ❤
i learnt alot more than i thought i would, i can actually apply this in my flight sims
Excellent presentation , need to rewatch to get the things in brain
7:05 It didn't occur to me that the foward speed of the aircraft decreases the propeller angle of attack even if the propeller AOC is fixed.
Skip all the singing here ---> 1:39
Well here it all is, how about that, probably the first time I've felt the need to pause a video while writing a comment for said video. I've often said, " we've forgotten more than we've learned in the past 100 years" and brother have we learned a lot.
I have learned a lot! Those graphics are really great. I really understand the reverse thrust. I had it wrong in my mind.
Wow, the way the oldies explain aviation related information is much more clear! Does anyone know who made this lesson and where I can find more of them?
VP variable pitch propeller is so much easier to have than a fixed pitch.
Just the approach and landing is a totally different experience!
"You'll have a quiz on this on Wednesday." Thanks prof!
I am taking notes!
Superb indeed. Thanks for uploading.
Very informative! Thanks, for uploading.
Brilliantly explained. So informative.
Well if it had covered some animations on the pitch governor and adjusting pitch, this would have pretty much covered anything a pilot would need to know about propellers.
A Whole Textbook
Thanks Mate!
thanks for the video David, learn a lot about prop aircraft, did not know this much engineering is applied on propellers only
Well, if I wasn't understanding very well propeller pitch control and rpm, now I'm completely baffled... I'll need to watch this over and over again... :)
Sorry, if were so well explained, WE wouldn´t need to watch it 100 times more !
So get on with it... Watch it again and again.
@@Peter-zz9ur bruh
What do the letters "Z" and "V" at 1:12 and 1:19 in this video mean? Whose planes are these?
Wow this is a great video explanation thank you for posting this !! I had such hard time understanding aoa in relation to flight, this helped so much! 💥👍🏼😀🙏🏼🙏🏼🙏🏼
Thank you Lord for allowing me to find this gem.
Perfect video and explains! Thanks.
nice to remind what i did learn long time ago
Short precise sentences. I understood every word even though I didn't grasp half the physics.
@David Wright must be one of the Wright Brothers with having this video in his archive.
are there more like show but about other aeronautical subjects?, they are amazing, bring me back to groundschool
6:01 doesn't he mean linear velocity, not rotational velocity? I thought rotational velocity (w) and linear velocity (rw) aren't the same...
6:11 I get that the tip of the propeller moves faster than the base but I still could not wrap my head around why the angle of attack would increase at the tip when it is visibly uniform from base to tip. He said "the angle of attack would increase" how so?
From the standpoint of the propeller section (tip or hub), there are two vector "components" of airflow.
The larger is airflow resulting from the prop rotating through the air. It will be in a direction flowing toward the flat, high pressure side of the prop airfoil.
The lesser airflow is due to the forward motion of the prop (and plane) forward through the air and induced flow. This will be at 90 degrees to the airflow due to just prop rotation. Its direction will be toward the curved, low pressure side of the prop airfoil.
The actual airflow is the vector sum of these two components, and its ultimate direction (angle of attack as the video calls it) will depend on the relative velocities of the two "flows".
The forward lesser component will be the same for prop sections at the tip, and toward the hub. Let's say for clarity both prop sections are angled at 45 degrees to rotation. And lets further say that at a prop section half way toward the hub is experiencing a forward airflow velocity that EQUALS the rotational velocity there. A little quad rule napkin sketching will show that the resulting total airflow will strike the 45 degree prop section squarely on the nose, for an effectively ZERO angle of attack.
Now lets move out to the tip.
The forward airflow is the same, but since the tip is twice as far from the hub, its rotational velocity, and the airflow that causes is now TWICE what the forward flow is. Going back to the quad ruled napkin will show that the resulting combined vector will now strike the 45 degree prop, not on the nose, but on the high pressure side of the prop section at about 20 degrees. This equates to a 20 degree angle of attack at the tip, while half way toward the hub the constant 45 degree pitch prop is experiencing a zero degree angle of attack.
It is important to remember that angle of attack refers to an airfoils orientation regarding the media it is flowing through, not necessarily the same as its orientation to vertical, horizontal, or even the craft it is attached to.
@@NullHand thanks, now that you explained this clearly. I am now completely lost hahaha. I'm going to read this many times, I think I got a little more understanding now.
Thanks to you and youtube.
Great, clear commentary no music
this video is on point, i was wondering how front propeller make the plane fly (lift or drag)
That was a great video, thanks!