Unless I'm mistaken, ori_b is asserting that you can't generate lift without sending air off in another direction (i.e. downwash), and this is false. Again, most lift is generated this way - my posts here seem to be mistaken for arguments that Bernoulli force contributes significantly to the lift. It does not. However, the work done to reconfigure the air surrounding the wing by the Bernoulli principle will contribute to the lift, and while it does result in moving air around (not necessarily down though, actually), it does not impart any net motion to the air after the wing has passed.
Yes, both ori_b and I are asserting that you can't generate lift without sending air off in another direction. If you don't impart a net motion to the air, then by conservation of momentum you also can't generate a net lift.
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Unless I'm mistaken, ori_b is asserting that you can't generate lift without sending air off in another direction (i.e. downwash), and this is false. Again, most lift is generated this way - my posts here seem to be mistaken for arguments that Bernoulli force contributes significantly to the lift. It does not. However, the work done to reconfigure the air surrounding the wing by the Bernoulli principle will contribute to the lift, and while it does result in moving air around (not necessarily down though, actually), it does not impart any net motion to the air after the wing has passed.
Yes, both ori_b and I are asserting that you can't generate lift without sending air off in another direction. If you don't impart a net motion to the air, then by conservation of momentum you also can't generate a net lift.