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Because the path it takes is longer.

This is the Bernoulli effect.

Be aware that the small amount of upward force from the Bernoulli effect IS NOT the principal force that allows an aircraft to fly.

Be aware that the explanations you read in most textbooks ARE NOT the correct explanations for aerofoil lift.

To prove this is so, your task is to explain how an aircraft can fly inverted.

According to the "Bernoulli effect" explanation, the aircraft should plummet towards the ground at an acceleration of 2g.

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