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The power required for an airplane depends on these main factors

Weight: Increased weight effects two main power related factors: the inertia of the aircraft will be greater, and therefore more power will be required to accelerate it within the length of a runway

Induced Drag (the drag created by the wing when it produces lift) will be increased as the wing will be under more load, and so more power, or thrust, will be required to overcome this drag

Role: What speed the aircraft is designed to fly at: more speed needs more power

Coefficient of Drag: How much drag is created by the aircraft a a whole, generally more for large aircraft. the greater the Cd, the more power needed

Generally, a small training aircraft will have around 160-200 Hp, large propeller aircraft (eg. DC3) around 1000 Hp and airliners ranging from 20,000 to 80,000 lb of thrust

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