Mini Titan pitch problem

[connoleg]

Hi,
I have just finished a rebuild of my Titan which was previously setup by an experienced builder. This time I thought I'd learn to do it for myself so I can gain a better understanding.

I followed the Finless CCPM videos and I have the three servos at 90 degrees. Swash is level. Washout arms are level and mixer arms level. But the pitch at mid stick is +2 and I am not sure what to adjust to get it to 0 as the blade grip links are set as per the manual and cannot be shortened. If I were to increase the length of the blade grip links the pitch would become more positive I believe.

I'm using a Spectrum DX7
Swash mix is
aileron +60%
elevator +60
pitch -60

Throttle and pitch curves are linear at this point.

Any ideas guys?

Thanks
Gary

[EricW]

You could try to remove the two setting screws of the rings on the main-shaft.
One ring is on the top (of the upper bearing block) and the other one is at the bottom of the shaft.
First clean and then re-loctite the two setting screws and put them back in but don't tighten them completely yet.
Now you can move the shaft up and down a little(I believe the shaft had some flatspots for the settingscrews to settle on my MT) , and adjust your 0 point.
Once you have found your 0 pitch point at mid stick tighten the lower ring.
Pull the head a little and press the upper ring down when you tighten that one, so you remove the vertical play in the shaft.
Check if the shaft still spins smoothly and you still got 0 pitch, and you'r good to go with 0-pitch at mid-stick.

Hope this helped.

Eric

[MikeWz]

I believe the links you need to adjust are, according the manual, the links labeled "E". I can't think off hand of whether or not you need to shorten or lengthen them, but turn both of them in 1 full turn and check the pitch again. Then you'll be able to tell if you're moving in the right direction. You will have to move both of them the same amount, as each link is for one blade.

[connoleg]

You could try to remove the two setting screws of the rings on the main-shaft and moving the shaft down.

Hope this helped.
Eric

Eric
I did as you suggested and it worked! Thanks.

I now have 0ish at mid-stick. I was a bit surprised to get -8 and +12 at low and high stick though. Is that OK?

thanks

[ghtracey]

What do you get when you remove the links and move the swash to its physical limit up and down? If that is -8 and +12 then maybe you shouldn't have reset the position of the main mast and should have adjusted the linkage to 0 your pitch instead. That 2 degrees you took off at midstick would have made -10/+12 on your pitch range hade you adjusted the links instead. Just a thought.

[EricW]

Oh sorry :oops:
No, that's not good, ghtracey is right I guess.
You should get about -10 0 +10 with all servo travels at 100%.
I setup the head just like the manual.
So i used all prescribed linkage lengths and all my servoarms were at exactly 90º at midstick.
After that i measured at mid stick and the pitch was not 0, than i used the method I posted earlier in this thread.
And in my case it worked because after I centered it I had about -10-0-+10.
You should get just as much positive as negative pitch on the head.
Please do what ghtracey says.
And tell us what you get when the arms are removed.

Eric