Pitch: what am I doing wrong

[djparvin]

Guys, I'm setting up my new titan and I'm having trouble with getting even + and - numbers on pitch.

I've built 6 helis before and so I should know what I'm doing. The radio is setup ok, straight 0% to 100% pitch curve, atvs 100% and sub trim 0.

The pitch servo is centred and the servo arm is level. The collective cradle & swash are level and I get 0 pitch at mid stick. Everything ok so far.

But I get +13 and -9 at full stick, I want +11 and -11.

If I modify the servo to collectve cradle link to get +11 and -11, mid stick is now +1 not 0.

I could set the mid stick to 0 and not worry about it but given that everything is equal it should mechanically give me the same + and - It's almost as though I'm getting some differential in the pitch servo movement.

Ah, a though. I copied the model on my radio from my Sceadu 50 as all the radio gear is the same - don't remember checking for any exponential or differential but I can't believe I have any on the Sceadu either. I will check though.

Other than that, anyone have any suggestions?

[savage]

Not positive, but shorten the linkage on the swash. Or make it longer, my Titan is being repaired.

[BarracudaHockey]

Mines the same way. I just use +- 10 via the pitch curve and use the extra positive in throttle hold.

[djparvin]

Solved it, the servo arm wasn't quite level at mid stick which introduced a bit of differential. Must admit I thought I had checked this first.

Andy, by coincidence I've also now set mine to be +/-10.

Thanks guys for your comments.

[Eric Lis]

Its easy to get more range if you want though....dremel and a metal tray......

[djparvin]

No thanks :shock: +/-11 is more than enough for me at this stage thanks.

I was more confused about the apparent difference between + and - given that everything else was equal or so I thought.