Dual servo elevator setup

This discussion shows data that can help understand subtrims. While the measuring equipment was setup I made a few more measurement to satisfy my curiosity. A comparison of the performance of old with new servos, trim effect, and expo data are shown.

Correct geometry of linkages connecting the servo to the control surface is paramount. Subtrims should not be used to adjust surface neutrals at the expense of linkage alignment! Particularly elevator linkage with the typical dual servo system. Exactly matched elevator surface movement is a necessity and can only be achieved with exact linkage matching. Subtrim is a tool that allows us to adjust the position of the output arm of the servo and should only be used for that purpose. Most servos have splined outputs and usually arms are supplied with the splines offset a bit from the arms so that they can be rotated to achieve the best alignment.

This is where subtrims come in. The question is: Does the use of subtrims result in different servo travels in a set of elevator servos? To explore this question I rigged a pair of new Futaba BLSSV servos with a wheel to which is attached an angle bracket onto which Xicoy angle sensors are mounted.

The Xicoy meters have 0. An oscilloscope connected to one of the normal elevator channels provides a digital readout of the elevator channel pulse widths. Elevator function was set to the LST slider, using the detents to provide repeatable TX position output. Trim settings were centered. Subtrim setting effects were measure at various offsets. For expediency servo travel in one direction only was measured. Some things to consider beyond subtrims when setting servo travels. Thanks again. Does it matter which way you face servos?

Have a parrot Disco. Anybody know how to set servos for test flight? Set level? Use a potentiometer? Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.

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Featured Video. Sitewide Ads. Profile Form Profile Data Profile Form In an effort to better serve you, our reader, and ensure a rich and relevant experience please help us by completing this Airplane interest profile. Own A Plane. This is useful when you want to trim each elevator separately, or if your main pitch control is setup as ELEVONS , and you also want some normal elevator. Typical servo output for motor power control for vehicles. Multiple outputs can be used for multi-engine vehicles.

Primary power control output for normal fixed-wing planes, single rotor helicopter, and rovers. In Rover, these outputs are for control of the steering motors in Skid-Steering Rovers. In Copter, theses outputs are used for the Bicopter motors. The rudder output function provides a rudder outputs with its own per-channel trim and range.

Separate rudder channels are particularly useful for nose wheel steering where the nose wheel may need to be reversed as compared to the normal rudder channel or for multi-wheel planes.

They are very useful for aircraft which have ailerons but no flaps. See the Flaperon guide section for more details. Note that flaperons act like Automatic or normal flaps, described above for the flap component of the output. Provides outputs for Elevons. Provides outputs for V-Tail Planes. See Differential Spoilers section. See the separate page on setting up ground steering.

This output is for throttle control of an auxiliary Booster Motor to add an additional vertical thrust source in Multi-Copter and Quadplane applications. This output controls the landing gear servo s in Copter and Plane.

See landing-gear for more information.