![]() ![]() ![]() Drop tanks are generally expendable and often jettisonable. Drop tank ĭrop tanks, external tanks, wing tanks, pylon tanks or belly tanks are all terms used to describe auxiliary externally mounted fuel tanks. Main articles: Conformal fuel tank and Drop tank F-4E Phantom carrying two underwing pylon tanks and a centreline tank Conformal fuel tank Ĭonformal fuel tanks (CFTs) or "fast packs" are additional fuel tanks fitted closely to the profile of an aircraft which extend either the range or endurance of the aircraft, with a reduced aerodynamic penalty compared to external drop tanks. ![]() The weight of the tanks and fuel counteract wing bending loads during manoeuvres and reduce fatigue on the spar structure. Many aircraft designs feature fixed tip tanks mounted at the end of each wing. Many high-performance light aircraft, helicopters and some smaller turboprop aircraft use bladder tanks. The bladder is rolled up and installed into the compartment through the fuel filler neck or access panel, and is secured by means of snap fasteners or cord and loops inside the compartment. Bladder tanks īladder tanks, bag tanks or fuel cells, are reinforced rubberised bags installed in a section of aircraft structure designed to accommodate fuel. Combat aircraft and helicopters generally use self-sealing fuel tanks. These tanks are commonly found in smaller general aviation aircraft, such as the Cessna 172. Rigid removable tanks are not relied on for the aircraft's structural integrity. They are typically made of metal, plastic or fibreglass construction, and may be removed for inspection, replacement, or repair. Rigid removable tanks are installed in a compartment designed to accommodate the tank. ![]()
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