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40:, testing it both with a box of pigeons and again with a model helicopter. They concluded that the contents being in flight made no difference to the weight, and theorised that the downdraft of air from the wings or rotors pressed down against the base of the box with the same force as the resting bird or helicopter.
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research team from
Stanford University measured the forces involved in a bird's hovering and found that it created "double the lift during the downstroke so that the birds did not have to lift their weight during the upstroke", with the amount of lift on the upstroke being "almost none". They
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