It is the wings, not the engines, that enable an airplane to take off. The engines only propel the airplane forward, but takeoff is entirely dependent on the shape of the wings. The upper part of the airplane’s wings is more curved than the lower part. When the aircraft begins to move forward, the airflow splits into two parts at the wing. The air passing over the upper part of the wing travels a longer distance due to the curved surface and accelerates compared to the air below the wing. According to Bernoulli’s principle, the pressure of the air decreases as its speed increases. As a result, the pressure above the wing will be lower than below it, causing the aircraft to take off. Sails can be thought of as the vertical version of airplane wings. We use sails like airplane wings to sail at angles close to the wind. We achieve low pressure on the leeward side and high pressure on the windward side..