| 词条 | Trim drag |
| 释义 | Trim drag is the aerodynamic drag component of an aircraft created by the flight control surfaces on an aircraft, mainly elevators and trimable horizontal stabilizers, when they are used to offset the changes in center of gravity as the aircraft flies. For a natural stability in pitch and in speed, aircraft are designed in such a way that the center of mass (center of gravity) is forward of the center of lift. The nose-down momentum is compensated by the downward aerodynamic effect of the elevator and the trimable horizontal stabilizer. This required "negative lift" of the tailplane (horizontal stabilizer and elevator combination) produces induced aerodynamic drag in a similar way as the positive lift of the wing produces induced aerodynamic drag. The changes (shifts) of the position of the center of mass are often caused by fuel being burned off over the period of the flight and require the aerodynamic trim force to be adjusted. They are magnified in designs where the wing planform is not arranged to lie directly outward from the fuselage, as in a swept wing or delta wing aircraft. Systems that actively pump fuel between separate fuel tanks in the aircraft can be used to offset this effect and reduce the trim drag component. {{aero-stub}} 1 : Drag |
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