Dihedral works via the lower wing having a higher angle of attack when the plane is disturbed by a gust as you mentioned. At that moment, when the plane banks, it simultaneously side slips in the direction of bank. The relative wind is now aligned with the raised upwind wing which has a theoretical angle of attack of 0 while the lowered downwind wing some angle of attack greater than 0. The result is that the lowered wing produces more lift, and subsequently drag, which causes the lowered wing to rise back up to level and the adverse yaw straightened the nose back out.
Don't keel surfaces contribute to destabilizing moment which encourages a roll, So if there's large surface area below longitudinal axis the lateral stability is less? I'm confused now
From Mike Thompson: Good point, it depends if the aircraft is high wing or low wing. Please see PHAK pg 5-18. I didn't make it clear in the video that we are referring to the C172, a high wing, which we fly for primary training at Epic... Keel effect is stabilizing if it is a high wing, not stabilizing if it is a low wing.
Dihedral works via the lower wing having a higher angle of attack when the plane is disturbed by a gust as you mentioned. At that moment, when the plane banks, it simultaneously side slips in the direction of bank. The relative wind is now aligned with the raised upwind wing which has a theoretical angle of attack of 0 while the lowered downwind wing some angle of attack greater than 0. The result is that the lowered wing produces more lift, and subsequently drag, which causes the lowered wing to rise back up to level and the adverse yaw straightened the nose back out.
what a GREAT VIDEO!!!
The stability explanation was interesting. And reassuring.
Thank you so much, sir, how you explained the information and the examples make it all clear. Kudos to this channel!
You're very welcome!
Section Six of the POH deals with weights and balances, not section 5
Don't keel surfaces contribute to destabilizing moment which encourages a roll, So if there's large surface area below longitudinal axis the lateral stability is less? I'm confused now
Your flight instructor will discuss this further with you.
From Mike Thompson: Good point, it depends if the aircraft is high wing or low wing. Please see PHAK pg 5-18. I didn't make it clear in the video that we are referring to the C172, a high wing, which we fly for primary training at Epic... Keel effect is stabilizing if it is a high wing, not stabilizing if it is a low wing.
A lot of older planes like the 727 and the DC-10 have 0° dihedral.
Dihedral angle is the answer for the final question I believe
Isnt the pendulum effect false?
Subtitles / closed-captioning need to be corrected.
Appreciate you letting us know. We just updated them, thank you!