Originally Posted by italia
..... a difference in center of lift between the two wings.....
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I spoke of a
center of lift. That is, where the lift may be considered for purposes of Newtonian dynamics to be punctually concentrated. There is just one of those, not more.
Just as one speaks of a center of gravity. That is, where the weight many be considered for purposes of Newtonian dynamics to be punctually concentrated. (One doesn't speak, for example, of "...a difference in center of gravity between the two wings..")
Where does the center of lift shift if, say, the left wing produces more lift than the right wing? And how does any force produce a rotational moment? (Answer: by having an arm to some point about which a body may rotate.)
PBL