e325 SE tail setup questions

[FishRider]

Thank you for this forum as it is a great resource. I could not have got this far without it, I am new to the hobby and I am building my first heli after fllying a cx2 for awhile. I am close to getting my mini titan done but I am stuck.

Problem 1: When I put my tail servo at 90 degrees my tail pitch control is about 2/3 towards the outside of the rotor shaft. This means I cannot get full throw without the control binding to the outside. If I move the servo so that the control sits more to the middle than I have a serious pitch to the rudder. I can input some serious trim but then I would have to really limit the throw distance towards the inside.


Problem 2: I have a JR X9303. When I set the Gyro in INH (i"nhibited" If I am correct) the gyro will lock and the servo runs normally. However, if I try to set the gyro to AUTO and set the sensitivity the servo will stick, when manually moved, towards the position it was put until it is manually moved again. Is this normal!?!

I have e325SE with stock motor and ESC. JR921 reciever, HS-65MG on cyclic, futaba S9250 on tail.

[FishRider]

Sorry, I forgot to put in the post that the Gyro is a Futaba GY401.

[kas4j]

First, set your end points back to normal (100/100) and take out any sub trim or trims.
Now rotate the servo around the boom until the arm is lines up with the bottom. You want the linkage rod to run as straight as it can to the tail.
55435

55436

Now center the servo and put the arm 90 degrees to the boom. If the arm wont mesh at 90 then rotate it 180 degrees. If you already cut the arm down to a singal sided arm and it wont mesh at 90, get a new arm.
55437

Now line the pitch lever up to be paralle with the tail rotor shaft.
55438

And now you can adjust your linkage rod to fit. adjust your gyro limit to stop just before it binds. you should have equal throw in both directions


On the 401 your limit should be somewhere around 100 and there should not be any trim in the tx.
As you can see by the pic above i made my own hole for the ball link. That is so I could get the exact amout of travel I wanted at 100% on the limit and the exact center I wanted without sub-trims.

When you say it "sticks",I think what you are talking about is the servo holds it position when you move the rudder stick in one direction. Yes it's normal, the gyro is tying to put the tail in the postion the Tx told it to.
Rotate the heli slowy back and forth by hand and you will see that the gyro is trying to correct the movenents.

I'm not familiar with the 9303 but you probally will not want to or ever turn off the HH mode of the gyro. I would think to would turn it on and set your gain to around 72-75% to start with. Like I said, I'm not familar with the 9303.

I hope this helps ;)

[FishRider]

Thanks for your help. I pretty much had done all that, but I re-checked it and did it again. I have to set my limit at just under 80. There is nothing mechanically wrong that is discernible. I just do not seem to be able to set the rotor on the shaft so that I can get maximum travel. Question is can I live with that? Since I have never flown this or any other heli like it I do not have a frame of reference to know whether or not this will affect performance.

[kas4j]

are you getting equal amounts of travel on both sides? if so turn the limit up a little. If you are getting more one way than the other then something isn't 90 or parallel. If it's just not traveling far enough then you need to move the ball on the servo further out. mine is 8mm center of arm to center of ball

[kas4j]

also the tail on these small helis are pretty quick. be easy on the sticks starting out. maybe set up dual rates at 60% just to get the feel of it. it's faily stable but can get away quick.

[FishRider]

My ball is set at about 8mm as well. That was about the maximum I could get without bending the rod down a bit. Travel seems to be equal to both sides as well. I set the limit to the maximum I could get before the travel hit the inside of the rotor.

[kas4j]

pitch lever parralel, servo arm 90, linkage rod staright in line, equal throw and stops just before binding you should be good. 80% isn't bad. about the minimum I would go but not bad. having a lower limit means less resolution so the gyro works a little harder to hold. you could move the ball in a little more if it concerns you.

watch bob's video it helps. all of bob's video are excellent
http://video.helifreak.com/?subpath=finless/trex450&filename=gyro_setup.wmv

[FishRider]

Thanks, I have watched every 101 of Bobs plus a few more. Great stuff.

[FishRider]

Well I tore the whole thing down and messed with the tail to see if there was anything I missed mechanically or if I could move the tail unit in or out on the shaft. It seems the issue is just a limitation of the tail pitch link and where it sets up on the shaft when it is all together. I have more travel to the inside and less travel to the outside. Seems I am stuck with what I have for the moment. Once I get it up and running I'll know whether or not I care to try and modify something.

[kas4j]

in the manual under tail unit assembly-2; right below step 4 it says to
Note:
Mind the direction of the double joint lever.

if this is wrong it could be your problem. look really close at the center of the joint lever and will see what looks to me like a triangle. in the correct position its pointing away from the tail case. if i'm just telling you things you already know please forgive me..;)

[FishRider]

No apologies needed. I appreciate the extra head. Sometimes you miss obvious things. In this case I do have the lever set correctly. I have looked over everything several times and I can't find anything wrong. The link just sits to far to the outside of the shaft and there are no adjustments that fix it. I spent two days on this one issue and at this point I have decided to move on. I just want to fly this thing.

Once I have the build done I will take the Heli down to my LHS where I bought it and have the guy down there look it over. He said he was building a MT as well so he may have some pointers.

[helikev2]

There's a write up on tail set up & i think pretty much answers all the question about setting a tail. though it's for Trex but its generic info for 450 like mini titan.

here's the page... http://www.trextuning.com/modern-gyros.php

[R.Lim]

Thank you for this forum as it is a great resource. I could not have got this far without it, I am new to the hobby and I am building my first heli after fllying a cx2 for awhile. I am close to getting my mini titan done but I am stuck.

Problem 1: When I put my tail servo at 90 degrees my tail pitch control is about 2/3 towards the outside of the rotor shaft. This means I cannot get full throw without the control binding to the outside. If I move the servo so that the control sits more to the middle than I have a serious pitch to the rudder. I can input some serious trim but then I would have to really limit the throw distance towards the inside.


Problem 2: I have a JR X9303. When I set the Gyro in INH (i"nhibited" If I am correct) the gyro will lock and the servo runs normally. However, if I try to set the gyro to AUTO and set the sensitivity the servo will stick, when manually moved, towards the position it was put until it is manually moved again. Is this normal!?!

I have e325SE with stock motor and ESC. JR921 reciever, HS-65MG on cyclic, futaba S9250 on tail.


If you are running a JR TX and RX, you should inhibit the "Gyro"(code 44), and only using the "Gear" channel )= channel # 5) to set up the gyro sen. The menu 44, Gyro menu is meant to set up the gyro automatically when you are switching from N mode to Idlel 1 or 2 modes. But since you will using the switcher , so, the most easiest way to set up any gyro in a JR radio is to inhibit the gyro menu # 44.