trim drag

trim drag

trim drag
Operation of trim tab may change the value of lift and drag values. Any additional drag by operation of trim tabs is called trim drag.
trim drag
An increment in drag, resulting from the aerodynamic trimming of an aircraft. The tailplane in any aircraft produces lift, which may be positive or negative. In the process of producing lift, drag is also produced. If additional lift is required to trim longitudinal forces, then the drag produced is called trim drag. Its value is maximum when the aircraft is flying at low transonic speeds.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
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A sagging aileron or flap may be the cause of tremendous trim drag. However, unless you have found something terribly awry, check your airframe manual before leaping to possibly erroneous conclusions.
Even taking this into account, a wider fuselage was needed and a very large horizontal tail, leading the aircraft to suffer from increased trim drag and reduced maximum lift.
Tail load and associated trim drag are reduced by this process.