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On Thu, 19 Aug 2004 at 08:11:24 in message
, Todd Pattist wrote: True, but so what? The same thing is true of a wing. You never hear of downwash or wingtip vortices *above* the wing, yet it's still true that most of the lift from the wing comes from the top surface, not the bottom surface. The pressure difference relative to static is still greatest above the wing. You're confusing where the air comes from with the force produced by deflecting that ai Right. The only way forces can be applied to a wing or a prop is by differential air pressure on the component itself. The generation of such forces can only occur when a momentum change is produced on the air. The only way you can jump off the ground is by applying an equal force to the ground and to the bottoms of your feet. You also have to provide energy to create the change of momentum that gives you a vertical velocity. This is not quite the same as the wing or prop but I am trying to reinforce the principle that forces that move or support objects must be applied directly to the object. Some things may seem different (like magnetic levitation), but it is just that the force is supplied by a force field. -- David CL Francis |
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