מתוך cross country.THE VENTURI EFFECT
"Whenever a flow is forced through a constriction we can observe venturi effects. The flow speed in the constriction increases and the pressure drops. In the photo above we see the narrow gorge just west of the launch at Bassano, Italy. Time and again this gorge eats pilots who underestimate the venturi effect and blunder too far in, only to find that they cannot get back out against the wind. There are some small landing options but they are far from ideal."
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