Tail Pitch Slider Centering?

[qb7ops]

I have a question regarding the mechanical setup for the tail. First off, I do follow Finless Bob's video; they are outstanding for newbies such as myself. During setup of my tail and 401 gyro I followed Bob's video: "401 Gyro Setup".

At the beginning, he talks about adjusting the servo position on the boom so that the "tail pitch slider is in center of travel between hub and tail-case". In his video it appears that his tail rotors are in neutral position when the slider is centered. However, when I center my pitch slider, the tail rotor blades are not neutral. (Picture #2)

If I center the rotors so that they are both in a neutral position, my tail pitch slider is far right with little room for deflection. (Picture #1).Therefore I do not get full deflection in both directions.
Also, there is not way I can see to adjust the rotors to neutral when the slider is centered.

During my mechanical setup there is no rudder trim or subtrim are all at 100%. Rudder servo is centered, push-rod centered along boom, and Gyro (401) is on normal. I have a TrexSE carbon and a Microheli Pro Tail.

My question is: how can I center the pitch slider and have the tail rotors at neutral at the same time? Or, is this not necessary to have the rotors neutral during mechanical setup - only the pitch slider centered? (You may have to enlarge the picture to get a better view if necessary)

I appreciate any professional input!

[z11355]

it depends on the way the bellcrank was designed. you may well NOT be able to get everything
centered & 'null' at the same time.

But ultimately, it doesn't really matter. The 401 doesn't have independent endpoints so you're
better off making sure the servo arm/pushrod is is centered when the tail slider is centered.
Let the tailblade position be whatever it is.

[qb7ops]

Roger that. I will give a shot at centering the pitch slider and leave the tail blades as the lay. Thanks!

[raylepper]

Tail rotor pitch has to counteract the yaw introduced from the main rotor (in order to hold a steady heading in a hover). If the tail rotor was at zero pitch, the heli would turn (yaw) opposite the direction of the main rotor rotation. So the 'neutral' position of the tail rotor blades needs to have some pitch—enough to counteract main rotor torque. (This is pretty much 'designed in' to the linkages of the tail slider.) Setting the pitch slider in the center (like Bob said) gives you an approximately equal amount of pitch 'change' away from that 'neutral' pitch setting.