8 ms·
This is not how it works, no falling or positive angle of attack is required for an asymmetrical aerofoil. Imagine swinging a bucket of water over your head - t
by tomsto 5y ago
This is not how it works, no falling or positive angle of attack is required for an asymmetrical aerofoil. Imagine swinging a bucket of water over your head - the force your arm feels is similar to what the top surface of the wing feels.
- bbojan 5y agoIs that so? I thought that for asymmetric airfoil, zero angle of attack is by definition the angle where it creates no lift. So, tautologically, if it's creating lift a (positive) angle of attack is required.
- tomsto 5y agoFor a symmetric aerofoil, 0 angle of attack is 0 lift. For an asymmetric - there is (some) lift, which comes entirely from the suction side. https://www.wolframalpha.com/input/?i=NACA+6409+airfoil&assumption=%7B%22F%22%2C+%22AirfoilAngleOfAttack%22%2C+%22a%22%7D+-%3E%220%22 https://www.wolframalpha.com/input/?i=NACA+6409+airfoil&assu...