Stock Tail

[jad]

Now what have I done wrong.

if I give full left rudder the tail slider hits the pitch control arm? now when the tail is spinning this would become a dead block and jam I have seen other post regarding the flaw in the design.

So is how should you set the tail up? - guide anyone, should at netural stick the slider be in middle of the tail axial or should it be middle between where the arm hits the linkage and the outer edge? should I set end points on the tx

[surgicalCFe]

Its weird. With my slider in the correct position I can't get the tail slider pitch arms to bind nor can I get it to hit either the tail blade hub or tail case. The tail servo just won't go far enough and I actually have more potential movement with the stick on my tx than I can use. Meaning the stick goes farther than the servo will travel. I can get the arms to bind if I have the slider to far towards the tail case past middle and when right at middle I notice a little bit of binding with the pitch arms, a momentary "click" of the arms, and just a little farther towards the hub I get nothing but smooth action.

[Buzzkill]

I think there's several things that affect the binding issue. The limit you have set on your gyro and TX the position of the servo on the tail boom and the length of the servo arm your using.

On mine the middle of the shaft past the housing will cause binding and a difference in the tail rotor pitch at maximum throw. The pitch is greater with left rudder if set in the middle.

The way I set mine up was slightly past middle away from the hub (or closer to the tail rotor blades). This allowed approximately (I didn't actualy use a pitch gage) the same amount of pitch in both directions without binding. I attached the linkage to both the servo ball link and the pitch control arm (servo arm is already centered at 90 to the servo case when powered up). I attached the RX battery and adjusted the servo position on the tail boom until the tail rotor blades were at zero pitch and tightened the servo in place. Next I set the limit on the gyro to maximum travel without over extending the linkage in either direction or allowing the slider to bind on the pitch control arm mount. I re-checked the tail rotor pitch at full left and right rudder and they are the same and no binding. I fired up the Heli, adjusted the gyro gain to eliminate any wag and that's it.

Worked well for me. If you guys have a better way please let me know. (not being a smart a$$)

[surgicalCFe]

I think there's several things that affect the binding issue. The limit you have set on your gyro and TX the position of the servo on the tail boom and the length of the servo arm your using.

On mine the middle of the shaft past the housing will cause binding and a difference in the tail rotor pitch at maximum throw. The pitch is greater with left rudder if set in the middle.

The way I set mine up was slightly past middle away from the hub (or closer to the tail rotor blades). This allowed approximately (I didn't actualy use a pitch gage) the same amount of pitch in both directions without binding. I attached the linkage to both the servo ball link and the pitch control arm (servo arm is already centered at 90 to the servo case when powered up). I attached the RX battery and adjusted the servo position on the tail boom until the tail rotor blades were at zero pitch and tightened the servo in place. Next I set the limit on the gyro to maximum travel without over extending the linkage in either direction or allowing the slider to bind on the pitch control arm mount. I re-checked the tail rotor pitch at full left and right rudder and they are the same and no binding. I fired up the Heli, adjusted the gyro gain to eliminate any wag and that's it.

Worked well for me. If you guys have a better way please let me know. (not being a smart a$$)

My understanding is that you want to have a bit of positive pitch to start with in order to keep the tail in place initially. The boom will want to rotate in the opposite direction of the main blades on spin up and you therefore wouldn't want to start at zero pitch which would cause the tail to rotate rapidly to the right (when viewed from behind). You don't need as much travel towards the the hub because of the tails tendency to want to rotate to the right anyways. So you set the slider a little bit farther towards the hub than the tail case. Basically you need a have a little more positive pitch available to you than negative pitch.

Actually not entirely sure if its positive or negative pitch but at any rate you want the leading edge of the tail blades rotating up towards the main blades and to be tilted towards the tail boom to begin with. No idea what the pitch should be, just have to play with positioning the servo to get it right. Then you adjust travel limits if needed and as long as you can get a few deg (thats a guess) of pitch away from the tail boom you will have a decent spin rate to the right.

Please correct me if I am wrong. I want to make sure that I am doing this correctly.

[jad]

So far I have tried a tower pro SG50 and a maxwell MX306BB on the tail I use the inner most hole on the servo arm the servo just seems to have a lot of travel hence a lot of movement to the slider, I am using the stock telebee gryo at the mo,

Is there a more suitable tail servo with a arm that has more of an inner arm? quite happy to change as I know the maxwell's have a tendancy to come apart, ( used tape on mine to make sure )

I have checked around and it is suggested you don't use EPA on the tail as it doesn't work that way. I have just ordered a S3154 for the tail, but how do you limit the servo throw, being the telebee doesn't have servo end point adjustment like a gy401 or 2100T logitech. All I can see is to set the linkage arm to the inner most servo hole, Thus giving the least movement, this is a total pain only other solution is to change the gryo

Why did they come out with such a flawed design! if they made the slider slightly longer the arms would have missed and you could get full travel, I did look at changing for a MH tail box but I know people said you would have trouble getting parts, I did ask them and they said they did have spares but reading about not sure what to think.?

[jad]

Well the Futaba S3154 arrived and I have now fitted her, using the inner most servo hole it is all fine she now clears the stock with out jamming, a few things you need to clean up the boom supports to fit this servo not a big job and the Dremmel did it in under a minute.

So a tad windy out there at the moment but hoping to get her air borne later today.