Today I seen that the plane carrying the soccer team in Brazil crashed.. i m terrified now of crashing again I finally got over it for a few weeks now this happened... please tell me I ll be okay I ll be going to France in February.
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Usually it is airspeed of the aircraft. Each aircraft has different airspeed requirements for operation the flaps or landing gear. Usually that speed is determined by the airframe manufacturers and the design of the flap system component. You could built it strong enough to handle any airspeed, but a plane can only carry so much weight. If you built everything to work without any limitations you might have an airplane too heavy to fly. Designing a plane is a balance between lifting capability and weight. Both of these are important design parameters.
As the wings are lifted by differences in air pressure and gravity acts on the fuselage, the extra fuel load in the wings won't really affect the curvature. Rather, this is for the large storage capacity (volume) of the wings, and the safer option that your fuel tanks are outboard, rather than crew / passengers sitting directly on top of a "belly" tank. In event of a fuel-fire or crash, there is still a chance of fire being extinguished, or fuel-laden wings breaking away in a major crash. The spread-out mass of the wings also adds to stability by increasing the inertia.