- Measure of time or airplane wings To measure the wingspan of a bird, a live or freshly-dead specimen is placed flat on its back, the wings are grasped at the wrist joints, ankles and the . [clarification needed]A . A high lift-to-drag ratio requires a significantly smaller thrust to propel the wings through the air at sufficient lift.In military aviation, a is a unit of command. In most military aviation services, a is a relatively large formation of planes. In Commonwealth countries a usually comprises three squadrons, with several forming a group (around 10 squadrons). Each squadron will contain around 20 planes. which approach or exceed the speed of sound sometimes incorporate variable-sweep . These give a high aspect ratio when unswept and a low aspect ratio at maximum sweep. In subsonic flow, steeply swept and narrow are inefficient compared to a high-aspect-ratio .Schematic of
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