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#9
December 4th 03, 09:47 PM
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Nyal Williams wrote in message ...
Now, I'm confused! An airfoil cannot produce thrust -- only 'lift.' But if an airfoil has a reverse counterpart, the two are joined at the center and rotated about an axis in a vertical plane, they are then a propeller; this produces 'thrust.' Well if that last statement is true then the earlier one is false. Do propellers produce thrust? -- FF 
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