Q.

Following graph represents          

A. graphical method to find mac
B. graphical method to produce drag
C. graphical method to find lift
D. graphical method to find lift-curve
Answer» A. graphical method to find mac
Explanation: above figure is showing the typical graphical method to find the mac. here, first we project the root chord from tip chord and vice-versa as shown by dashed lines from respective chords. after that we draw a line from which will connect midpoints of root and tip chord. intersection of both lines will provide mac which will be located at y distance from root chord as shown.
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