Lift Equation Explained | Coefficient of Lift | Angle of Attack 

Thanks!

Hi! If you dig way back in the channel videos you should find one, I believe titled weight and balance. If it’s not there I’ll upload one down the road!

Thanks! Maybe an idea for a future vid

I was waiting for this comment haha! I debated adding some explanation around velocity vs "vitesse" for V but decided to stick skip over it for simplicity

Velocity is a vector (I believe in this equation). Therefore, Lift is also a vector (vector analysis).

@@flightinsight9111 I’m sure plenty of people are already scared away from math “with letters.” So trying to discuss the difference between scaler and vector calculations when it’s arguably not particularly important here is likely just counterproductive. It’s part of a larger equation which is vector-based but, in this context, it’s a scaler calculation. It’s still a perfectly valid explanation and a well-done video overall. Keep up the good work!

Thanks, Kerron. Nice compliment.

Will give that a try

Bernoulli is a big part of this! The pressure differential helps the wing more effectively turn or deflect air downwards, which is why we stick to that general explanation in this video. But the lift equation certainly takes Bernoulli into account.

@@flightinsight9111 ah, I see, thank you for the reply :)

Awesome. Hope it made sense!

@@flightinsight9111 it cleared some things up, you do a great job explaining!

The force object receives is always normal to the contact surface and air pressure always acts normal to the surface of the body. This has long been well known, and I don't know why in flight theories and aerodynamics books this is (mostly) omitted.

Bugged me too. The key is not movement up down, back or forth, but acceleration in any direction. When lift equals weight, the airplane isn't accelerating its rate of climb or descent. This is obvious if it remains at altitude, but is also true if it is in a constant rate climb or descent. With thrust and drag, it's the same thing. If it's remaining at a constant speed and not accelerating, it's in equilibrium.

@@flightinsight9111 Great explanation! It makes sense now when I think about it, thank you for your reply :)

I want to make sure i understand correctly: when you bring down flaps, you increase the surface area but also change slightly the camber of the wing, with the trailing edge being lower than originally. That increases the aoa, hence the CL, increasing the Lift. Which makes sense when you drop flaps, the airplane tends to balloon up a bit. To maintain the constant 2000lbs of lift and maintain constant altitude, the only thing left to change would be the velocity, which would have to go down, since flaps bring extra drag. Then you’re in equilibrium again. Am I on the right track? Great video and thank you!

He's explaining Newtons third law of motion. For every action there must be an equal and opposite reaction. The wing's angle of attack causes air to be deflected down causing a force up: creating lift. Yes, wings push air down to create lift.

Hi Jer! Thanks for mentioning Bernoulli. Whether it's pressure differential thanks to the wing shape, or impact lift from relative wind, it helps keep things simple by characterizing all of these principles as causing air to be deflected downwards, keeping the wing aloft.

That is correct, Jer. If you push air down, your elevators wouldn't work on rotate nor your rudders left/right. Bernoulli "sucks" the tail down the same way it does for the wings or "pulls" the tail when using rudders.

@@AviationDirection Not sure what you are trying to say. In level flight the wing will always deflect air down and the elevator will either deflect air up or down depending on fwd or aft cg. During rotation, the elevator will always deflect air up. One can consider Bernoulli or pressure distribution but at the end of the day, if air is not deflected there is no force from the airfoil except zero lift drag.

@@XPLAlN 🤷🤦