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Typical trim tabs on aileron, rudder and elevator. Trim tabs are small surfaces connected to the trailing edge of a larger control surface on a boat or aircraft, used to control the trim of the controls, i.e. to counteract hydro- or aerodynamic forces and stabilise the boat or aircraft in a particular desired attitude without the need for the operator to constantly apply a control force.
Most fixed-wing aircraft have a trimming control surface on the elevator, but larger aircraft also have a trim control for the rudder, and another for the ailerons. The rudder trim is to counter any asymmetric thrust from the engines. Aileron trim is to counter the effects of the centre of gravity being displaced from the aircraft centerline ...
During World War I, Flettner developed the servo tab / anti-servo tab. [9] [10] The servo tab evolved into the "trim tab" which is still in use on all airplanes and many large vessels. [1] [9] Trim tabs are extremely useful in moving large rudders on vessels with vastly reduced power. [1] [9] The Flettner rotor ship Buckau
An anti-servo tab on the elevator of an American Aviation AA-1 Yankee. An anti-servo tab, or anti-balance tab, works in the opposite way to a servo tab. It deploys in the same direction as the control surface, making the movement of the control surface more difficult and requires more force applied to the controls by the pilot.
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In aviation, the turn and slip indicator (T/S, a.k.a. turn indicator and turn and bank indicator) and the turn coordinator (TC) variant are essentially two aircraft flight instruments in one device. One indicates the rate of turn, or the rate of change in the aircraft's heading; the other part indicates whether the aircraft is in coordinated ...
A radio magnetic indicator (RMI) is an alternate ADF display providing more information than a standard ADF. While the ADF shows relative angle of the transmitter with respect to the aircraft, an RMI display incorporates a compass card, actuated by the aircraft's compass system, and permits the operator to read the magnetic bearing to or from ...
The direct tension indicators shall conform to required chemical composition, compression load, and dimensional values." [ 5 ] Like other fastener components, DTIs are covered by the Fastener Quality Act of 1999 in section 3: Definitions (6), [ 6 ] where a DTI is described as "a load-indicating washer, that is through-hardened".