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Sweepback design wing

Asked by: 4092 views Aerodynamics, Commercial Pilot, Flight Instructor, Private Pilot, Student Pilot

Hello everyone,

 

I am having diffciulty understanding sweep back wing design and its characteristics in genration of lift. I know that stall progression develops from tip towards root and wing sweepback is slanted rearward. However there is a spanwise flow that decreases in magnitutde. Can anyone explain why and how aileron loses effectiveness and stalls first ?

Lastly, is it true that air flows parallel to the chord of the wing (chordwise flow) to generate lift? I  could not find this information on PHAK but some internet sources.

 

Steve

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1 Answers



  1. Bryan Kutcher on Aug 23, 2018

    Steve, this would be an excellent question for Peter Garrison, Flying Magazine.

    So, you may have answered your own question. As the wing stalls from tip to the root, the ailerons lose effectiveness. The ailerons are usually going to be located outboard of the flaps and closer to the tip than the root. When the tips begin to stall, progressing inward, the ailerons will not be effective.

    Ailerons are not effective in our C172 fully-developed stalls until we are flying again, right? Same principle. Of course, our light aircraft are designed to stall from the root to the tip so as to maintain aileron effectiveness as much as possible until the actual stall break.

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