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Asymmetric flap and the different stall speeds one each wing.

Asked by: 2920 views Aerodynamics, Commercial Pilot, Flight Instructor, General Aviation, Private Pilot, Student Pilot

By definition: -An asymmetric “split” flap situation is one in which one flap deploys or retracts while the other remains in position. The problem is indicated by a pronounced roll toward the wing with the least flap deflection when wing flaps are extended/retracted. The roll encountered in a split flap situation is countered with opposite aileron. The yaw caused by the additional drag created by the extended flap will require substantial opposite rudder, resulting in a cross-control condition.

I understood so far upto here but the another phrase mentions:-

"The wing with the retracted flap will stall considerably earlier than the wing with the deployed flap."

Is this because the clean wing with aileron deflected downward has higher AOA and will reach the critical AOA at higher speed compared to another wing?

 

Steve.

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1 Answers



  1. Bryan Kutcher on Aug 23, 2018

    Steve,

    I found this:

    In all cases of asymmetric flap, the wing with the greater amount of flap extended produces more lift. As a consequence, the wing with the lessor amount of flap extended will stall first.

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