DROP TANK - An externally carried auxiliary tank, usually to contain fuel, which may be jettisoned if necessary.
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Drop tanks: Expendable external fuel containers to be "dropped" (jettisoned) before engaging target.
DS: Detached Service
DSC: Distinguished Service Cross
DFC: Distinguished Flying Cross
Do or DO: Dornier (German Aircraft) ...
Thus, airplanes can carry external stores, such as drop tanks, under the wings but not on top where they would interfere with lift. That is also why wing struts under the wing are common but struts on the top of the wing have been historically rare.
For aircraft with external drop tanks, the term internal fuel fraction is used to exclude the weight of external tanks and fuel.
They needed an endurance of two hours at normal power, or six to eight hours at economical cruising speed (both with drop tanks). Armament was to consist of two 20 mm cannon and two 7.7 mm machine guns and two 30 kg or 60 kg bombs.
Hardpoints: 4Ã- under-wing pylon stations can be fitted to carry 600 US gallon Sargent Fletcher drop tanks or weapons, each with a capacity of about 5,000 lb (2268 kg).
Avionics ...
 See also: Aircraft, Flight, Speed, Boeing, Tanks
  
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