...The affect of the right aileron moving down will increase the lift over that wing, whilst the left aileron in moving up will have a net affect of reducing lift on that wing. This then, is essentially going to start the roll (to the left in this case).
There are some secondary affects of this. The right wing, in generating more lift will also generate more drag! The opposite will happen with the left wing. So, we now have a situation where there is a yawing tendancy as the right wing generates more drag.
OK, here's the bit I don't get. The wings are actually producing the
same lift. If they weren't, the aircraft would be accelerating about the roll axis, wouldn't it? Perhaps that happens for a tiny fraction of a second while the rate of roll is established, but after that the rolling moment is zero.
In a constant rate roll, the couple from the ailerons is balanced by the higher AOA of the downgoing wing causing that to have greater lift. Thus overall, the lift on each wing is the same. In a slip, the couple from the ailerons is balanced by, for example, the greater lift on the into-slip wing due to dihedral. So again, overall, the lift on each wing is the same.
But don't we feel aileron drag for much longer periods than that, in fact, whenever the ailerons are deflected? So can we
really blame the induced drag that comes with differential lift for aileron drag?
