the sharp bend around the nose even for small angles of attack, so a separation bubble develops at the nose. When the angle is increased the bubble grows smoothly until it reaches the trailing edge and the maximum lift is developed. No jump in lift occurs, but the drag is large for all angles. On a section of medium thickness, 9-12% (case c), both types of separation start to develop at relatively high angles of attack.
Fig 6.26 Effect of trim tab
Lift at zero angle of attack
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