Thank you! This is the best explanation of the asymmetric blade effect I have found. Until now I could not understand this phenomena but your explanation has sparked a light bulb moment for me!
Your graphic with all the angles and vectors is missing one important vector. You do NOT need the vertical line that gives you a 20° angle to the plane of rotation of the propeller. You do NOT need the pitch angle. But what you need is the direction of relative oncoming airflow to the propeller. THIS then will give you the correct angle of attack relative to the propeller AXIS and you can add the angle of attack of the proppeller blade cord line to the first angle of attack (oncoming air relative to the proller axis) this in turn will give you the greater total angle of attak on the down-moving side of the propeller and the lesser total angle of attack on the up-moving side. You do NOT need the pitch angle. You need the angle of the airflow relative to the propeller axis. This effect of unequal angle of attack on the left and right side of the propeller is far greater than the effect of slightly different airspeed over the blades left or right.
I took the simple view that the relative airflow is the square root of the sum of the aircraft velocity (free stream) squared, and the rotational velocity of the propeller squared. This fairly accurate, but doesn't account for inflow etc.. However it is sufficient for this video. I'll do another video at a later date showing a more detailed analysis of the propeller. Thanks for your comment.
Can you explain how you calculated the relative airflow after the propeller has been pitched up 20 degrees? I’ve tried applying the law of sines and cosines but seem to be missing some information. Thanks for the terrific video.
This video represents having the nose pitched up while the plane still level and moving forward, an example being at a high angle of attack on takeoff or in slow flight
The best visualized asymetric loading explanation . Thank you so much to put very detail explanation much better than any text books.
Thank you! This is the best explanation of the asymmetric blade effect I have found. Until now I could not understand this phenomena but your explanation has sparked a light bulb moment for me!
The most acceptable explanation I’ve ever seen.
Wow, what a simple and clear illustration.
This must be the best video online explaining this phenomenon! Thanks, you solved a problem for me!
Best explanation ever made
Your graphic with all the angles and vectors is missing one important vector. You do NOT need the vertical line that gives you a 20° angle to the plane of rotation of the propeller. You do NOT need the pitch angle. But what you need is the direction of relative oncoming airflow to the propeller. THIS then will give you the correct angle of attack relative to the propeller AXIS and you can add the angle of attack of the proppeller blade cord line to the first angle of attack (oncoming air relative to the proller axis) this in turn will give you the greater total angle of attak on the down-moving side of the propeller and the lesser total angle of attack on the up-moving side. You do NOT need the pitch angle. You need the angle of the airflow relative to the propeller axis. This effect of unequal angle of attack on the left and right side of the propeller is far greater than the effect of slightly different airspeed over the blades left or right.
I took the simple view that the relative airflow is the square root of the sum of the aircraft velocity (free stream) squared, and the rotational velocity of the propeller squared. This fairly accurate, but doesn't account for inflow etc.. However it is sufficient for this video. I'll do another video at a later date showing a more detailed analysis of the propeller. Thanks for your comment.
Can you explain how you calculated the relative airflow after the propeller has been pitched up 20 degrees? I’ve tried applying the law of sines and cosines but seem to be missing some information. Thanks for the terrific video.
You have just solved this problem for me! thanks!
Air speed vector direction confuses me. Shouldn't it be parallel to the axis of propeller rotation?
i think hes doing it right as the plane started to pitch up, but has yet to actually start moving that direction
This video represents having the nose pitched up while the plane still level and moving forward, an example being at a high angle of attack on takeoff or in slow flight
Thanks for this great Video although have some confusing sign on your drawing but main concept behind is excellent... 👍👍
Wow amazing explanation doc!
Hi! Thanks for posting this video! :D
Can you show how you calculate the relative airflow?
I see a lot of rubbish on this subject. And lots of hand waving arguments and ‘proofs’. This is the most accurate I’ve seen yet.
I like this video
I Love you
I don't think you vectors are quite right.