9650 works better than 9257?

[HuskyD]

My 9650 tail was struggling a bit on the 450 in those real windy days recently (It would start to make a right turn, then stop and suddenly go again). My mate offered me a try of his 9257 to see if it made the turn better. I fitted it ensuring the servo horn was 90 degrees etc but with no other setup. It weather vaned into wind immediately, so I upped the gain (gy401) from 65% to 100%. It was a little bit better, seemed to hold, but would weather vane 90 degrees if I punched the power. I did the quick setup on the gy401 to memorise the neutral position, but same problem when I took off.

Now I know I did a very quick swap to test, but I'm struggling to work out why the 9257 wouldn't hold side on into wind and was really bad when a fist full of power was given, as I've definately done the same type of install and setup on the tail with the 9650 after crash repairs.
Could it be that the 9257 is faulty, or does it need a better gyro setup compared to the 9650?

[BobJ]

Hi

The gearing on the 9650 and 9257 is different so it might be possible that the overal travel range is different, it is VERY important with the Futaba gyro's and probably most others that you get full tail pitch slider travel, if the 9257 couldn't give you full slider travel then it wouldn't be able to function well.
It is strange that you could run so much gain though as normally about 40% is all your going to get with out wagging, maybe the servo arm ws too small, head speed low or the servo's buggered.

Cheers
Bob

[moyesboy]

There is something wrong.
either of these servos with a 401 should hold a full power climb out and go sideways happily at fairly high speed.

My guess is you have too low a head speed (too much torque from the rotor and not enough revs on the tail) or you don't have as much tail pitch travel as you can get.

Fit 9257 gears to the 9650 to up the speed a bit rather than change the servo . This with a 401 and the chinese weights on the tail grips seems to be pretty much the ultimate 450 tail

[jamiem]

ultimate tail is chinese weights, 9257, and spartan gyro ¶ as has been said, it sounds more like a setup problem

[HuskyD]

Thanks guys,
Head speed is definately not too low. I have the 450XL with 13t pinion and 100% flat line throttle curve.
I didn't check travel with the 9257 though and just used the same servo arm off the 9650.

I'll borrow it again and see if travel is the issue. Wha's the betting the one time I want a lot of wind, to replcate last weekends gales, the damned weather will pick up and be 3mph winds.

[Leebert]

I spent a fair bit of time fiddling with my 450 SE V1 tail recently and the biggest single change was when I added the Align '3k' carbon tails.
I'm currently using a 401, 9560 with the two 9257 gears, small round disc but drilled even closer (about 8 or 9 mm). 401 limit pot spot on 100.
I have sort of put on some chinese weights by using a longer tail blade grip bolt with an extra nut on each side for the weights.

[Made2Fade]

Might it have anything to do with the 9650 being 6v compatible and the 9257 not??? Im having exactly the same problem on one of my mini titans. The 9650 holds brill but the 9257 on the second model seems to be loose and doesnt hold the tail with even very small pitch punches. Try putting a step down on it if you havent already got one.
Cheers
Lee

[BobJ]

Hi

Nope sorry not going to be a voltage issue, had a 9257 on the tail of my 500 for a long time with no step down and BEC set to 6V, no problem.

Cheers
Bob J

[Made2Fade]

Just a final ditch thought as mines got me very puzzled now also. Strange thing is it worked perfect on my Gazaur Mars. Its a 3 flight old Servo and 401 gyro so i know there fine. Must be something on the heli then. Tail is silky smooth, no binding and the gyro/servo are setup exactly the same as the other ones on the first model.
Cheers
Lee

[jamiem]

tail ratio differnce maybe between the 2 different models you had it fitted to?

[Made2Fade]

tail ratio differnce maybe between the 2 different models you had it fitted to?

Means nothing to me that mate??? Not as if i can do anything about that and it should still work fine on the mini titan tail.
Cheers
Lee