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drop tank

British  

noun

  1. an external aircraft tank, usually containing fuel, that can be detached and dropped in flight

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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The year he turned 21, in 1958, he traveled to Bonneville, where he got behind the wheel of a belly tank racer — a streamlined car made from a modified aircraft drop tank — and reached 236 mph.

From Washington Post