![]() Drag in this sense varies with the square of the aircraft's speed. Some of the drop tank's fuel is used to overcome the added drag and weight of the tank. External fuel tanks will also increase the moment of inertia, thereby reducing roll rates for air maneuvers. The primary disadvantage with drop tanks is that they impose a drag penalty on the aircraft. External tanks are commonplace on modern military aircraft and occasionally found in civilian ones, although the latter are less likely to be discarded except in an emergency.ĭrop tank storage aboard USS Harry S. A drop tank is expendable and often capable of being jettisoned. In aviation, a drop tank ( external tank, wing tank or belly tank) is used to describe auxiliary fuel tanks externally carried by aircraft. A 600 US gallons (2,300 L) Sargent Fletcher drop tank being moved across the flight deck of an aircraft carrier ![]()
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