Not many RC KZreadrs doing whiteboard talks about the basic physics. Thank you for producing this!

Thanks for the physics lesson Bruce. Can't wait for lesson 2. Awesome job mate.

Brilliant stuff, watched this over breakfast and it's given me something to think about all day.

Thank you so much for covering this. I looked on the internet and no one covers this content as thoroughly as you do

Years and years searching for a channel that speaks about aerodynamics in a simple AND LOGICAL way... finally I found you!

The simple "finger"-explanation of the center of pressure finally made it click for me. I had a lot of lectures in university about all aeronautical subjects and I always took the center of pressure with a shoulder shrug. I could kind of get behind it and I understood the concept of why you need it, could solve problems in exams involving it, but I never had an intuitive feeling for it. Now I do! Thank you!

I love these types of technical videos, thank you Bruce!!

Sir, You have rendered this complex topic in a clear, concise and straightforward manner. Outstanding presentation.

Keep it up Bruce, I've been slacking on your channel a bit (due to new Canadian regulations getting me down) but these videos are universally interesting, so when one pops up on my subscription feed, it's impossible to ignore. Thanks man!

Excellent Vid series!!! I will be sure to pass these on to my followers!!! Thanks for all your great vids over the years!!!

Another very clear video lecture, I first started watching your videos when you explained the advantage of having a proper inlet cowl around a ducted fan in an earlier video.

Thanks Bruce. Nice overview. I am currently working on a DLG flying wing design and I appreciate the review of the basics! Looking forward to part 2

And this is why people love your channel. Great video, Bruce.

Love these whiteboard vids you do Bruce, and you havent done one for ages. Please do more, like explaining decalage in depth so i can tune my glider.

I love watching this guy lol... He's so informative and very inspirationally positive and upbeat... Boy am I glad I joined his channel! Thanks Bruce! (Are all Aussies friendly? Damn Ima move there lol- they sure are not here in the states) and I'm heading straight over to patreon to give some well deserved financial support and bonus content this guy definitely deserves it (no in no way am I conoenapsated nor have I ever even heard of Bruce I'm just sincerely pleased finding his channel)

Amazing vidéo Bruce, as usual ! ;) Thanks a lot for all what you do !

Thanks Bruce, a really clear explanation. I'm looking forward to the next instalment!

Thanks for " Theory of Flight " 101 .....Brings me back quite a few years !!

Awesome! Been discussing with my mates why flying wings defeats the use of a regular lifting airfoil because of the addition of the reflex. As such, all my flying wing designs have been a simple symmetrical airfoil. Maybe not as efficient but definitely easier to construct and quite stable. Thanks for explaining it well.

Great work, very easy to follow - keep it coming!

I understand reflex now!! Thank you Sir Bruce :)

Very interesting stuff, this helps me to understand the flight behaviour of my plane better and really explained in a super understandable way! 😊 I am already looking forward to the next video.

Thank you Bruce. I knew about Reflex, but now I know that reflex applies to flying wings only. I started flying fixed wing aircraft using a flying wing and thought that all aircraft needed a degree of reflex. Now I know that is not the case. I look forward to learning more on Part 2.

Brilliantly explained Bruce .......

I keep coming to this video! Thank you for everything ♥️

You are presenting the info in a very pleasant manner!

You surely know how to share knowledge, and make it fun. I hope someday my wife and I can travel to NZ so I can shake your hand.

His videos are some of the best. I am using these to help my 14 year old nephew learn flight physics for models.

@Observ45er

Жыл бұрын

Try this part of the explanation of lift: *kzread.info/dash/bejne/ZYGH08Snkq6qnbA.html* . Cheers, I studied aerodynamics and consulted with some well known experts along the way, specifically on this.. . .

I thought that you were going to draw the Yin/Yang symbol for a moment there Bruce. A truly well balanced wing. Excellent and informative video! Thanks.

As an aeronautical engineer who has sat through many lectures as a university student on aerodynamics involving way too math it's nice to hear such a lucid talk and not get lost in the calculus and mathematics. Some of my old profs would do well to emulate more of your style and less mathematical proof!

@somefuckstolemynick

6 жыл бұрын

Agree, I'm specializing in Turbomachinery (so lots of fluid mechanics and blade profiles) and I have the same experience. This basic intuition is what provides the foundation to build the math upon, at least for me. Plus the intuition is just plain fun! Sorry for the pun. ;)

@killerriot22

5 жыл бұрын

Andrew Carolus and Fredrik Wahlgren: May I ask if you use a CFD software now, or if you only do mathematical models in your work and or hobby? I'm very interested in having some good CFD recommendations for aerodynamics. I'm well read in using and creating these models in software and am just looking for a short/simple wing design cfd software or program for all my tinkering and scientific brain to make all the shapes and cambers it desires. thank you!

Thanks for keeping your explanations simple. You are not talking to aerodynamicists who still cannot agree, but model airplane people who need only a basic understanding, even if that looks in error to the experts. Thanks again

@RCGache

7 жыл бұрын

Hear, hear! I am an electrical engineer (digital design) and I do not have the time to take 3 aerospace courses and study partial differential equations (again) to fully understand these concepts. You did it in just under 22 minutes! Excellent piece of work Bruce!

Excellent Bruce. Looking forward to next episode.

Thanks for this awesome video. will jump to the 2nd part now

easy to listen too, simple explanations. Good stuff mate.

Nice explanations thanks. I've understood it better than before.

awesome tutorial Bruce! Thanks for feeding my brain!

I had half a second delay between the video and audio and was entertainined no end. thank you Bruce

Very educational as always! Awesome stuff. Thanks

Thank you for all the knowledge.... very informative... hope we get more like this

Amazing video! love the energy and content

Excellent video! can't wait for the follow up.

The main problem with flying wings is the total downforce moment that can be generated by the reflexed TE is very limited because of the short arm and this results in a very limited amount of forward CG that can be tolerated. On gliders this isn't too much of a problem since a wide CG range isn't necessary, but not on powered planes. Jim Marske's FW gliders have very good handling and stability and their performance appears to be slightly better than a tailed glider with the same overall plan form. On the Genesis sailplane, a Marske design, he added a small horizontal tail surface at the top of the swept fin. He was strongly against adding it but was pressured into it by the project's financial backers, who thought it would make the airplane easier to sell.

I am 13 and going to be building a wind turbine so I decided to learn some basic aerodynamics. Even I could understand. That was one of the most interesting lectures I have heard

Really exellent explanations!

Very informative Bruce! I've got a wing built from left over wings from an Air Hogs Titan kid's chuck glider. It has quite a bit of rearward sweep in the wings and some reflex has been applied. Its maiden is still awaiting so I have no idea how it will fly. Wingspan is 47' with some Coroplast winglets at the tips. CG works out to be quite rearward because of the swept wings so getting it to balance there and with some extra given to the nose has been a treat! Had to add quite a bit of dead weight even though using a 3S - 2200 battery. Really no science has been applied to it during its construction but hey, it looks good! :) Looking forward to your continuation on this.

I really learned new stuff to day! Thank you!!

I've long been interested in aircraft, and understood conventional aircraft design, but the lack of tail on flying wings always confused me. I was never sure where the pitch stability came from, thanks so much for this video. I always assumed that because flying wing designs feature swept wings that the wingtip somewhat acted as the tail, but reflex makes a lot of sense. This makes designing an RC flying wing seem a lot less intimidating as well as reflex could just be trimmed into the ailerons. Gonna give it a go!

Very informative, thank you Bruce

Nice video. Thanks Bruce.

Wonderful explanation, thank you very much!

Hello, thanks for this video... I'm not an engineer, just an ex USAF mechanic. Some time ago, while recovering from surgery, I build a paper 3D F-102 from internet plans, later, I figured it may fly as a slingshot glider, and it did ! It exhibited all the characteristics of a fow speed delta, it did the "Delta dance" it landed almost verticaly when it got behing the drag curve, etc... So I build 2 more, and this time with cambered, flat bottom airfoils so I'll get more lift... They didn't fly, they tuck under, the only way to fly 'em was to move the cg way forward and add up elevon... in one case I added a canard and it did well... so from now on I just build symetric airfoils but they also need a bit of up elevator or a Gurney flap... Thanks for your video !

fascinating explanation of the flying wings and how it works and the physics beyond it .

I think washout is very important too. By doing this you are creating something similar to reflex at the tips. Combined with the sweep the stabilising effect is produced at a longer moment arm and therefore you need less deflection and force. You can eliminate reflex near the centre of the wing and also reduce the tip stall tenancy and make it wobble less.

I'm really enlightened. Thanks.

awesome explaining, thanks!

A gift to us all. Thank you

Great explanation. Thanks!

Another question I have (in addition to forward swept wings you mentioned you would cover in part 2) has to do with semi-circular designs. Are there any benefits of curved wings in regards to flying wings, or is there a good enough reason for keeping most wings with a straight leading and trailing edge? Please cover this in regards to swept-back and swept forward flying wings if you have time. Thank you, and keep up the great informative and educational content!

Thanks Bruce this was very interesting.

Use to do 100mph LOS wings. Oscillations were a problem to the point that canopies and batteries would eject at high speed. This was especially true if the wing was a bit flexible. Looking forward to the next video.

This answers so many questions!

i was just trying to build a flying wing and stumble upon this video this is very good explaintion of lift and like how things are little bit different for flying wing now i have idea how lift is generated on flying wing i hopefully will going to build a really good flying wing..

great job as always

Great stuff Bruce. Like the way you simplify, even if the purists aren't all on board :-). Two comments, already partly covered by others: you refer to decollage as being the difference between wing and horizontal stab pitch angle, or off-set. I believe the correct French word is decalage, which means off-set. Decollage = take-off. The stabilising effect in pitch of the conventional tail: speed maybe has a role, but if so the response time is slower as the pressure profile and therefore resultant lift on the tail takes time to develop. The more immediate stabilising effect is the change in alpha the tail is seeing with the speed instantaneously being the same. Love your channel, mate.

I Love the whiteboard stuff. Thanks Bruce!

Thanks for clear explanation.

An amazing video - thank you for uploading

Thank you Bruce. I have learned a TON from you

Love vids like this thanks keep them coming 👍🏻👍🏻

finally the aerodynamics continue :3

I fly quadcopters and want to get a plane. I'm trying to decide on a conventional plane or a flying wing. The fact that so many people are using wings instead of planes made me want to check out the pros and cons. I recall a documentary about the first flying wings and them being very unstable and killing some test pilots. I thought the B2 bombers must fly because of computer control of the flight surfaces, correcting thousands of times a second faster than a human could do. I assumes all RC wings had flight controllers with gyros doing the same thing but I see plenty of flying wings that don't have flight controllers. Just an esc, motor, receiver and a couple of servos. This is a really interesting video series. I'm learning a lot. Thanks for making them.

Top man, Bruce - interesting as ever!

Great job mate.

Thanks for another great video.

Great explanation 👌

what an awesome video, thank you sir!

Important to note that the relative airflow that the tail "sees" is coming from a different angle than what the wing "sees", due to the wing's downwash. For example, when gust pushes nose up and aircraft slows down, wing is producing less downwash and effective angle of attack of tail is reduced, leading to less tail down force.

This is great stuff Bruce. Please don't forget to post Part Two and maybe you could do a Part Three on how I can make a flying wing out of my FAA UAS certificate! [Thanks Mr. Taylor)

Very nice. What about twist at the wing tips? Is that more about reducing stall speeds?

Thanks for this video great work!!

I love these type of episodes, Bruce! Any chance we can get some HAM stuff?

Grade job, big fan love your videos!!

Thanks for details explanation Mr Bruce,even you speak very fast but still can catch some clue and information.....youtube have a undertitle here that can help us...thanks and have a great day

Very interesting explained in understandable terms. Seems like almost anything will fly with enough power. I hope you can include some explanation of how a wing with only the top airfoil rates in efficiency. That is a wing made from a single layer curved inwards (upwards) on the bottom. Thanks for doing these informative videos. AMA sent a notice that FAA registration is gone, but they said stay tuned ?

It was really good Video! waiting for next part!!!!!

Great basic explanation again. Love the way you cut through the arrogance of some of the 'experts' who love to complicate the issues to claim their knowledge as sacrosanct!

THIS is youtube. Sir, I love you video. My plan is to build an fpv-plane in very small. Not done Deltas before and had no idea before. I will watch these videos and see and tell whether it worked :)

love this guy ..greetings from germany

Thank you very much for this videos. I was wondering is it more efficient to put prop on the front on on the back, so can you please explain this. And whats most efficient shape of winglets

10:00 - it's not that simple. If the nose of the aircraft pitches up, that doesn't necessarily mean that it'll slow down. It'll slow down if the angle of attack rises - and if this is the case, the angle of attack of the horizontal stabilizer will change it's angle of attack too (by exactly the same amount). As the AOA (angle of attack) rises, the stabilizer will first produce no induced lift force, then it'll start to create lift, providing desired momentum on the CG. Speed change isn't the main factor here. Another thing is, that as the AOA rises the Cp (center of aerodynamic pressure) moves forward on the main wing (especially for cambered airfoils) closer to CG, so the momentum needed to compensate this force is lower than it was when the AOA was lower. The static longitudinal stability is not always achieved by creating a download on the tail. This is true only for the designs where the CG is placed in front of the Cp of the main wing. Even then, there are situations where the load on the tail is vectored upwards - for example the high angle of attack situation. High angle of attack with unsymmetrical, cambered airfoil, causes the Cp (Center of aerodynamic pressure of the main wing) to move forward - often in front of CG - this way the aircraft wants to rise its nose and we'd like to counteract by applying the positive lift on the tail. Apart from that, great video. Cheers!

Thank you. My old man was designing "flying barn doors" for years. I never knew why his drawings worked.

Really interesting . Thanks Insert joke about part 2 here :-) Could you please discuss differences in deep V (teksumo) ; shallow V (Hacker wing) & planks (your recent flying vids) Looking at a hacker vs Teksumo, is the shallow V hacker going to be more critical in getting CG spot on, is the deep V Teksumo easier to balance as the heavy motor is more in towards the middle ? Are the fins just using drag to make it stable ? Why are fins optional on some wings (Assassin Wing) Cheers

Good videos thank you for uploading

great stuff love your explanations so what makes wings like the buffalofx79 and the opterra so stable thanks Bruce

'Décalage' is the correct word, it quite simply means 'Offset'. Nice show very lively: Thanks

This principle is what I use on my Control Line Pulse Jets.The wire adds lots of instability for up & down motion so a heavy nose is perhaps the only way to solve it.The down fall is a wing lifting behind the balance point & so it adds drag .Stability sometimes costs speed.The fastest PJs on wire are hardest to fly.Less fun but win races.Most people dont realize the wire has so much drag up & down Any wind lift in front of the wire is no good.But you must have the balance point in front of the wire support point to keep the model square to you.

Great video Bruce. I've always wondered why flying wings wag...for example mine.

More videos sir this helped me a lot because due to the pandemic i can't start college and i'm taking aircraft maintenance technology this is very helpful!!! THANKS

Thank you very much Brus, I really like your white board video series, greetings from Poland. :)

Conservation of mass and the fact that air is an incompressible fluid explains lift quite simply. It works like this. Since the cross section smaller above the wing in order to pass the same mass of fluid (volume) through a smaller area it mus increase in speed. An increase in fluid speeds results in a decrease in pressure for laminar fluid flow and hence the lift.