Absolutelly impressive, Mr. RC! I am also an aviation teacher here in Brazil and you Sir will be my inspiration! Great class!

How did I miss the Newtonian component all these years? It was right in front of me but I never had someone explain it so well.

I don't hobbie in RC aircraft but this is obviously applicable to full sized aircraft. Very clear and concise video with a great host. Thanks very much!

As a licensed flight instructor (and rc modler) I must say, great video. You clearly have a good understanding of flight characteristics and can demonstrate/explain it very well. More of these kinds of videos would kick ass. Ok bye.

Grade 6 student here. I was extremely confused by this topic, thank goodness I came across your channel!

Well said, your center of gravity comparison was very enlightening, thank you.

I hope my teacher in aviation when I grow up will be like you, you're really good and I got the lesson fast!

I'm trying to build a plane in ksp, and this really helped. I had no clue what flaps were for, or even what direction to angle them before watching this video.

We are not asking for a physics dissertation here but an understanding that works. Your explanation gets the point across very well. Let the egg heads prepare a complex video with angle of attack and other variables that will put viewers to sleep. This certainly helped me to understand the concepts he was trying to convey and I thank him for it.

Your real good teacher thanks.

Just started working at an aerospace company. First day was deburring clutch plates for these flaps. So awesome.

I've been confused by how flaps work on planes,finally got an answer after 2 years of looking

You did a fantastic job. Explained two reasons for lift, and drag component of flaps. Score of 100 out 100. Need teachers like you.

I know this is not a new video, but I found it very helpful to confirm what I had already suspected. Thank you Bruce!

You teach like you invented aeroplane. I will like to make you my mentor. Great job done.

I knew very little about how flaps and how other items on an airplane worked but this presentation was very very good and understandable to me.

more please Bruce as a newbie found it interesting and informative and for a man of more advanced years and into this hobby for the first time

Fantastic Explanation! I am a multiengine and instrument rated private pilot and I have never heard such an in depth explanation about flaps before even though I have gone through years of study. Great job! Keep the videos coming. Jake from the USA.

Disregard my last comment. It wasn't your video but my computer. I tried again and it worked really good and was able to watch your video. Thanks for taking your time to share your knowledge with your subscribers.

Fantastic video!!!! Well done! Greetings from a student pilot from Germany!

Easily best teacher I've ever seen.. been in school for a long time.

I appreciate that you at least mention that the Bernulli effect as a explanation of why air-planes fly is at least disputed. The Newtonian explanation makes so much more sense and I'm convinced it is responsible for the majority of the lift created.

Bruce you gave a great presentation today on flaps. I had read an article last weekend about flaps and your pictorial explanation helped my understanding even more. Great job!

Excellent explanation! I was also a Grade 1 instructor and now I'm a B767 captain. A point of interest, the advanced flaps such as Fowlers, and leading edge slats, also increase the surface area of the wing and so increase the lift

Hi! It would be nice to see here Lilienthal's Polar Diagram, but anyway comprehensive presentation. Probably worth mentioning (or with more emphasis) - flaps are mainly drag generating devices (lift is not the main part here :). One equation to remember is quite easy in that case: Cdi (induced drag coefficient) = Cl^2 (lift coefficient squared) / Pi * AR (wing aspect ratio) Cheers!

Simply excellent Bruce! I enjoyed this very much. I just don't see how anyone could give this a thumbs down. Free and accurate information presented well. Probably five of the "Old Sore Heads" just pouting.

Sir, perfect explanation. I am starting my training in half a year from now and I am glad i found Your content. Hope you are doing well!

Thank you!! It is going to help me use my flaps on my Challenger, your explanation is very easy to understand.

A BIG BIG BIG THUMB UP !!! - I really enjoy your videos, as a X-Plane Sim Pilot, and real life Skydiver with over 200Jumps, this is total perfectly brought to the point. Will be watching your videos in future! Keep things going on, like this! Cheers from Germany.

now i am learning more then i thought, which was nothing. great videos. love them

Great video, I am just getting back into model airplanes and my Dynam Hawksky 4 CH motor glider needs flaperons, it glides so well, I need an acre and a half just to land ! Your whiteboard and ability to hold 4 colored markers while talking and drawing is remarkable. I know I needed flaps, I can now explain why to someone else, that is the lesson learned today.

Great video as always, maybe an explanation of difference between 20 degree flap for more lift to help take off and 20 + degrees to give more drag for landings, As stated flaps have 2 main effects they create extra lift and also extra drag, up to 20 degrees (approx) the extra lift component is greater therefor assisting with take off, at more than 20 degrees the drag component becomes greater there for helping to slow the aircraft down and help with landings , This is why many aircraft have multiple or variable flap settings for different stages of the flight

Totally spot on ... For advanced learners l'd like to add ... Flaps change wing camber & above all wing chord. Meaning increasing angle of attack (AOA) by some 5 degrees despite plane staying in same orientation. Plus control surfaces lose authority at slow speeds &n controls feel mushy

As a fixed wing private pilot I knew there were 2 kinds of lift but only the name of the Bernouli lift. I always called the other one "deflection lift" when the flaps were down. The best way to demonstrate both is to take a narrow strip of paper and hold it in front of your mouth. Blowing across the top of the paper gives you Bernouli Lift and blowing below the paper gives you Newtonian Lift. A clean wing is all Bernouli Lift and as you add flap you get less of that and more Newtonian Lift with more drag and therefore slower speed / lower stall speed for landing.

Super helpful, as an aspiring aviation simulator and someone going for my PPL license I greatly appreciated this.

lastly im glad you are making these videos. I am also glad they are simple as most people wont care about the higher complexity stuff. Just try and do a little refresher research to make sure the simplification is not misleading

Aaron, The change in airflow over the horizontal stabilizer (HS) with flaps deployment is the largest determinant of how the airplane will react. An airplane with a HS that is lower than the wing will generally have a nose up tendency, where an airplane with a HS that is higher than the wing will generally have a nose down pitching tendency.

Thank you a lot, please keep making videos of HOW IT WORKS. Cant wait till you will start explaining the electronics, please do not miss anything.

Sir, pls more of such theories videos !!! This was really helpful !! we want more of "THEORY TUESDAYS"

i now understand flaps ,thanks to you , keep up the very good work you do sir , all the very best .

Bravo,Well done! I've noticed a greater torque roll effect when accelerating with flaps down.

You did a great job explaining everything. Thank you soo much for simplifying aerodynamics

I love this theory and praxis explanations! It´s like going again to school or university :D

I learned a lot from Mr Bernoulli when I started messing with carburettors 40 years ago, and more when I began making and flying kites from about 25 years ago. So I'm only too happy to recognize him as one of the family along with my best friend Albert E. They both solve the airplane on the conveyor belt question.

Thank you. I learned new things today. I've always know how wing works with Bernoulli principle but for the Newton principles, it's the first time for. Very precise and clear explanation. Thank you again for this great video.

I'm a beginner and this video helped me a lot. It's perfect for people like me.

I thought I had a pretty good understanding of flaps before but this did widen my understanding, thank you! :)

This video is more than adequate to help people understand flap use.

Both are awesome. Thank goodness for variety!

Excellent examples, especially on the above wing as compared to the lower wing craft types., Thank you.

Great explanation Bruce, particularly since you spoke about the Newtonian part of it. The explanations I used to read as a kid really confused me as they made out that lift is only created by a wing with an airfoil shape, but I had model aircraft with no airfoil's or symmetrical airfoil's (control liners). When I studied engineering I learned that the Bernoulli effect is basically a statement of the law of conservation of energy.

Briliant. I was struggling with the concept of centre of gravity and that added it all up.

Great video. You make it all seem very easy to understand. Thank you

Thanks so much for your video. I was having a discussion with my three sons about the effect of flaps on aircraft and your video explains it very nicely in plain English that even my 9 year old should be able to follow. Cheers Kev

Thanks Bruce. I'm 56 and new to this that was great.

Great video very informative.Thanks.

Great info for a Noob in RC. Thanks for putting the time in to share your exeprance and knolage

Outstanding as usual! I'm grateful for your efforts - thanks so much. BTW, is there a way one can set up an AoA system for FPV using air speed sensors or something? Cheers!

Thanks for the video. I always learn something new watching them.

Excellent explanation on what flaps are good for. Don't own an R/C aircraft, but practicing w. the E-flite EC-1500 (which has a 3-position flap setting). Applying what you taught me, is leading to much smoother landings.

Wish you'd been my teacher at school. Complicated theory explain easy terms. THANK YOU

Really clear explanation of flaps - I have a much better understanding now, thank you!!

Brilliant informative video on lift theory and flaps, particularly pitch difference between low wing and high wing configurations, should be compulsory viewing for all new rc pilots.

Late to the party, but still an excellent video. I would like to add a warning to people who choose to go with "flaperons" on their model, (where ailerons and flaps share the same control surface). Especially when the model incorporates full length ailerons, (ie: aerobatic planes/flying wings etc.). You must be very careful of your speed and your directional corrections under these conditions. Any directional correction should be as minimal as possible. If you're flying your model with the flaperons deployed fully and the model is flying just above it's new lower stall speed, then you suddenly make a large correction with aileron input, the rising aileron will drastically reduce the lift thus taking away the extra lift the flap was giving and very likely stall that wing, causing a spin, if it has time to spin before it hits the ground. Just something to keep in mind.

Thank you so much, I will slowly increase my flap. Very good advice!

Thank you for the nice explanation on flaps. Now I understand why they recommand to put a bit of elevator down to a high wing.

Loud & very clear explanation. Thank you for sharing..

Great video. I learned that I had the wrong idea about flap deployment, but now I got the idea. Thanks!

You're the best my friend! We are learning so much from you!

Thank You very much for the video and very nice way of explanation. But , just one thing I would like to point out is that, modern explanations and newer research for the reason behind generation of lift suggests the 'Coanda effect' and not Bernoulli. The flow from the upper and lower surface do not meet at the same time.

Another great video. Clear explanation. I won't need to look anywhere else, I think I've got it. Thanks for taking the time.

simple yet concise. much better understanding now thanks

Mate...loved your presentation and it was so very helpful. Have always wondered the importance of flaps and you have explained it simply and easy to understand. Hat off to you and will be watching many more of your vids.. GREAT WORK...

Wings are amazing machines. When ever I fly I am always fascinated by the complex flap mechanism at takeoff and landing

Thanks Bruce! You are just an amazing asset to this hobby.

Actualy the pitch up and pitch down answer is because of flaps extra drag not because of extra lifting force. The cg of the plane must be already aligned with this wings lifting force and this forces will not create any tourque because it has not any perpendicular force between cg and lifting force line. If you create a new force with flaps drag or anything else that will cause a torque and this torque will try to spin model from its center point until you create a negative torque, in this example with elevator or something else Thats why the plane starts to act like it has a elevator movement That may be my first comment under your videos, because of that i dont want to be the bad guy :D just because of correcting something in video I like this channel so much and you are the one of my best teachers thank you so much for everything you teached me :-)

Great video, has been much needed!

You are completely correct, I did post a correction about 10 seconds after the original post. Couldn't find a way to edit the original post.

amazing... its been a while but you had been teaching and explaining RC plane to us. Good job and thank you for the hard effort.

I'm voting for "white board Wednesday". Love your videos by the way.

Wonderful Teacher!!! Very nicely explained!!! Thanks a lot!!!

Perfect teaching for me. Is simple to understand! Thanks young man!

you are better than my own aircraft instructor explanation ...thank you teacher

Hi Bruce, Wasn't sure I'd learn anything, but I like your vids and decided to watch the new 'teaching' segment. I never thought about position of the wing and center of gravity and resulting pitch when flaps are deployed. So I did learn something. Thank you.

Mostly correct but not entirely. As an ATP, Flight Instructor and RC pilot I have never had an aircraft need up elevator when deploying flaps. Theory on a white board is technically correct, but the amount of lift generated on either a high or low wing has more effect than the drag portrayed in this presentation behind the flaps. In both instances, in real flight, the aircraft with rise and need down trim to counter it.

great vid Bruce.Looking fwd to some more.

what a great lesson, it really cleared up my understanding about the flaps for different plane model

Brilliant lecture. Although you're intended audience is models it's the same for the full scale. It's helpful to visualize the effective chordline- from the leading edge to the trailing edge of the flap be it up or fully extended. The plane with full flaps will stall at a lower speed (assuming 1G level) but at a lower AoA than clean (the effective chordline is steeper due to the lower trailing edge). The same concept applies with slats- the effective chordline drops with the leading edge of the slats as well as the trailing edge of the extended flap. In jets with slats only extended, you'll be able to fly more slowly but your stall will be at a higher AoA, again the effective chordline is reduced with the lower leading edge. Usually you take off and land with both extended so it's close to the clean AoA. Also, I used to fly the Piper Aztec. When you extended the flaps there was a very pronounced pitch up (unlike other low wings). I was told that was the result of increased downwash over the horizontal stab. Lastly, I spent many years flying the C-141, a high wing heavy four engine jet transport. It too had a dramatic pith-up during flap extension (it had no slats). The rule was 4 4's- as the flaps went through 40%, make four long nose down trim pushes, lower the pitch 4 degrees, and push the power up to 4,000lbs/hr. Thanks for your effort. Cheers!

GREAT VIDEO, and explanations of lift. You should been a science teacher.

Awesome video. Very well explained. Cleared up all of my doubts. Thank you, sir

Bruce, thanks for the video, great explanation of Lift, I love reading the comments from people yelling that "you are wrong". apparently they were not listening to the beginning of the video where you told them that there is some contention about the theory you used. LOL you want to see an argument, go into any pilot chat room and get them going about lift, drag, etc... Although most will not discuss it because they know the outcome. LOL The only thing I would have done differently is I would have mentioned "angle of attack" but then again that could be used as a further video. Thank you for your work to better the knowledge available to those who are interested in the RC Flying hobby. I have watched several of your videos and have enjoyed you style of teaching. If you could, would you make one change to your page. could you place your teaching and training videos in a playlist. That would make them easier to find. Thank you Again.

Thanks for the great report. We have been having discussion about flaps, spoilers and spoilerons recently. This answered some of the questions. How about addressing: spoilers, spoilerons, and what happens as you increase camber on full span ailerons (some say turbulence causes tip stall). Don"t forget about us glider guys.

Thanks Bruce, excellent tuition!

Man! Awesome video on flaps. I have watched you since I've started RC

Sir! this is an amazing explanation! Thank you for your work!

Very clear, concise, explained it like to a 5 year old. Thank you!

Excellent introduction to lift and flaps Bruce. Well done. yes, I know that there are assumptions and a few people are pointing those bits out. BUT you are doing a basic introduction. And that is the point. Clear, concise and fun. Congratulations and all the best, Lincolnshire Rose.

Great instruction and illustration Bruce.Thanks!

Excellent explanation does the same in my piper cub....Cheers to the white board....

The fact that the air molecules meet at the trailing edge of a profile is wrong... The flow on the upper side is simply faster and therefore leaves the profile earlier.