Forces Acting on an Airfoil

[@Scottpulliam]

Dude! I am just starting my journey as a pilot, and I found your video while I was studying. Thanks so much for posting this. It really clarified what I was reading and made it all the more understandable.

[@bryanbonanno5131]

Still the best source for helicopter flight information. Thank you.

[@kevinwatkins6510]

Had so many questions after looking into the Helicopter Flying Handbook. I feel like the FAA should just put a link of this video in their section of aerodynamics. That would make it easier for everyone. Thanks so much! Greetings from Germany

[@ddtddt8493]

Well done Jacob. A little in depth understanding never hurts. Keep these videos coming as I’m sure even those who do not comment enjoy them as much as we do. Thumbs up.

[@claramelb7476]

That's interesting. I've never watched a video about helicopters and only clicked because it was talking about airfoils. It's fascinating to know that unlike airplanes, you can actually manually change the AOI for helicopters. I always assumed the AOI was fixed once the aircraft is designed/manufactured but then again I'd never paid much attention to helicopters until now Thanks for sharing your knowledge!

[@TheGroceness]

loving being able to go back and watch these

[@falconry44]

All your videos are so helpful. Getting ready for my private check ride

[@clisdan]

Thanks for this pls keep uploading. i have Engineering license exam tomorrow and am binge watching your videos before going to sleep wish me luck 👌

[@melanesianstory-time7205]

Best explanation. Thanks for the video. May God bless you more.

[@CC-bq7wk]

GREAT VIDEOS... Would you do a break down video of an approach plate and how it relates to helicopters....

[@PLISNO]

I wish I could give you more thumbs up but it's not possible. You look like a great guy, thanks for sharing your knowlege. Best regards from Brasil!

[@agonizedanguish6267]

Thank you! Taking my SIFT test soon and I'm extremely excited for flight school. If I pass my SIFT it'll be like a dream come true. I was told I'm overestimating the difficulty of it dramatically, but I'd rather be over-prepared than fail it and only have one more chance at it. Definitely going to be watching a lot more of your videos and putting a binder together with drawings and explanations.

[@THEUSMCMOTA]

How’d it go?

[@crawford323]

I would like a comparison discussion of the airflow transition during the process of forward flight to that of auto-rotational flight. As a gyroplane pilot, I find such complete explanations such as you provide very sparsely addressed in our industry.

[@ddtddt8493]

Hi Jacob, I went and found all the recordings of my flight lessons and are in the process of posting them on my channel. Hopefully answering questions and showing lesson by lesson that it can be done, I’ll inspire someone to pursue their dream of flying a chopper. Hope it helps like your channel helps everyone.

[@jean-louiscavallera4733]

DDT DDT very cool, but all in Italian, unfortunately. Thanks for your efforts.

[@antoinecamus51]

Great video again, clear and precise, helps a lot to learn and understand! Thanks mate!

[@diegoplata5570]

best instructor

[@jds1002000]

Keep ‘em coming man!!

[@adolfconradigharas439]

Thankyou brother this helped a lot. May you always follow GOD and His guidance. keep safe

[@Ab-ml1kd]

Thanks Jacob,another awesome lesson...!!

[@brianschwarm8267]

These are so helpful, thank you!

[@johnwerner8752]

@helicopterlessonsin10minutesorless Was the footage used in the beginning of this video from Katterbach Germany?

[@stevehoughton3854]

Love your explanations. Thank you!

[@davidwallace5738]

Thanks again sir. I understand the diagram but can you please explain how the induced fly is created. I've listened to all of your lessons and if I missed a previous explanation please direct me back to that lesson. Thanks again, sir.

[@davidwallace5738]

Induced flow

[@helicopterlessonsin10minut10]

David Wallace. Sure thing. I'll see about making a video that explains it in more detail.

[@davidwallace5738]

Thank you sir. Looking forward to it!

[@jaytheman3]

The FAA rotorcraft handbook is so dry and hard to understand at times. Thank you for this.

[@jaytheman3]

becawse cool bro not everyone learns the same 🤷🏼‍♂️

[@jeremylakenes6859]

Angle of Incidence on airplane is defined differently than helicopter?

[@VitorMoura]

One more great lesson!

[@tmanf22]

If lift and drag are always 90 from each other then the TAF never changes in powered flight, correct?

[@gehadqaki]

The TAF can change based on the size of the the Lift and Drag Vectors

[@charliekeyes6206]

Thanks Jacob

[@alexandramilne6032]

So, Rotational Relative Wind is the Induced Flow, or downwash, that an airfoil will come intact with, caused my the airfoil before it? So, the airfoil is being effected by the relative wind in addition to the Induced Flow of the airfoil before it? These two combining to make Resultant Relative Wind?

[@helicopterlessonsin10minut10]

Alexandra Milne. Rotational relative wind is the wind the blade experiences as it rotates around the mast. This velocity is affected how much airflow is being pushed downwards through the disk (induced flow). The resulting airflow is the Resultant Relative Wind. Imagine a helicopter with engine running and flat pitch sitting on the ground with zero wind. At this point rotational relative wind is the same as resultant relative wind. But as pitch is applied and induced flow begins to occur, or as blades flap, induced flow is introduced and there is a difference between the rotational relative wind and the resultant relative wind. I hope this helps clarify.

[@mariojorgepiresdasilva9956]

Good vídeo 👍🏾🚁

[@ahmadbems]

thanks jacob..may i know which direction drag acting actually? some book mention its against the chord line, some other book mention its against the rotational relative wind. can you explain or give any reference?

[@AmbientMorality]

Drag is always in the same direction as the airflow coming toward it, so the rotational relative wind for a helicopter (basically, this video is correct). Drag for any object is always parallel to the direction that air (or any fluid) is hitting it. In engineering, forces relative to the chord line are normal and axial, where axial is the force along the chord line (a value close to drag) and normal is the force perpendicular to the chord line (a value close to lift). I'm not sure if those terms are ever used in aviation; they're generally not as useful.

[@jantzen.]

Great video keep it up

[@waxinggibbous7820]

Nothing like a cushion creep departure and some jazz

[@beingbhutanese]

Thank you sir

[@TheRailroaddan]

Thanks Good video

[@kuyacopter]

What’s the song in the beginning?

[@helicopterlessonsin10minut10]

Chris Perry VI. I don’t remember the exact song name. But it’s one of the free ones included in the Splice app.

[@serg3y]

Even i can understand this! Thank you

[@skyloveglobalnelsonbarbonc8009]

Its good verynice im learning🚁🚁🚁🚁🚁🚁🚁🚁🚁🚁🚁🚁🚁🚁🚁🚁🛎

[@vlatkopopovski2685]

The authors have two wrong scientific approaches: researching the creation of Lift force and Low pressure at upper side of the wing, relative to the ground surface and Earth. I explain the aerodynamic cavitation and existence of Lee side aerocavern, and creation of Aerodynamic force.

[@mawsoncasey7347]

10 thumbs up

[@mawsoncasey7347]

And I just bought your book! Watch the videos then read the book it really makes the book so useful in getting to a really thorough basic understanding of helicopter flight and it makes doing your PPL Theory H course work a cinch!

[@crawford323]

Yikes induced flow is not clear to me.

[@miller745]

My brain hurts

[@angelomagalona6049]

Andrei Sunga shout out syo hahaha

[@tonyollier7098]

AEROFOIL!!! FFS!