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I'm not sure what you mean by "need" since weight is a concomitant - everything used to construct an aircraft has weight. It's a fact of life.

Aircraft designers do everything possible to reduceweight.

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12y ago

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How much lift does an airplane need to fly?

An airplane needs enough lift to overcome its weight in order to fly. The amount of lift required depends on factors such as the aircraft's weight, velocity, wing design, and air density. Pilots can adjust the airplane's angle of attack and airspeed to generate the necessary lift for flight.


How would you redesign your paper airplane to make it fly faster?

You can get a plane to fly faster (for a given force applied) by decreasing drag, e.g. reducing the width of the fuselage or wings (the latter also reduces lift). If you add weight to a paper plane, especially at the nose, you can get it to fly faster for a given acceleration (i.e. the throwing motion) -- the additional weight will increase the speed gained as gravity drags the plane down, because the air resistance is a function of the area, not the weight. A metal plane will fall faster (and with a higher terminal velocity) than a paper one if they have the same resistance area.


What elements are used to make planes fly?

Planes fly due to a combination of lift generated by the wings, thrust provided by the engines, weight of the plane, and drag caused by air resistance. Lift is primarily created by the shape of the wings and the air moving over them at high speed, providing the necessary force to keep the plane airborne. Thrust from the engines allows the plane to move forward, overcoming drag, while the weight of the plane is balanced by the lift generated by the wings to maintain altitude.


Would a fly flying inside an aeroplane add to its weight?

No. A fly hovering above you doesn't make you feel heavier does it? Although you probably would'NT feel it anyway.


Will an airplane be lighter when birds fly inside the airplane than sitting floor?

No, the weight of the airplane will not change when birds fly inside. The weight of the airplane is determined by factors like the total mass of the plane, fuel, cargo, and passengers - the presence of birds inside will not significantly impact this total weight.