Mini Titan Sonix tail box

[andyrauc]

Hi
I have a mini titan and recently upgraded to the bling supplied my Helimoto.co.uk. I think this is made by Sonix. The head assembly is really good but the tail seems to be giving some problems and I am not sure if it is just my setup. When trying to take off I am finding that the nose is trying to turn to the right. With full right stick I am barely able to arrest the swing. What appears to be the problem is that when the pitch slider is in the middle of its travel the pitch on the tail rotor is not enough to allow the heli to hover. It seems impossible to give the required pitch to allow the heli to hover in Normal mode with the pitch slider near the middle of its travel. It seems as if the stock tail drive shaft is too short resulting in the tail blade grips being too close to the slider resulting in too much pitch in the wrong direction. If anybody has any info to help solve this problem it would be appreciated.

[Made2Fade]

You'll find that the tail pitch slider wont be in the centre when your hovering. When its in the centre you'll find you have zero degrees pitch. You need 5 degrees or so to keep the tail straight in a hover. What gyro are you using?

Lee

[andyrauc]

Hi Lee
Firstly thanks for replying. I have read some of your posts with regards the Titan and nice to see you have replied. I am using a GY401. I am aware that the slider will not actually be in the middle when hovering. I find however when I am set up correctly that in HH mode I am not able to stop the Heli nose heading left. I have removed the Sonix unit and reinstalled the origional plastic one and although I have to give right stick input as I spool up the gyro is able to keep the heli from rotating. In Normal mode however I still find I am having to give quite a bit of stick input to stop the heli turning. I shortened the linkage a few turns and this has inproved the situation a lot. The problem is that with the sonix unit I need to adjust the slider so far to the left that it is only about 3mm from the casing. This does not seem right as there will not be much pitch adjustment left for flying.

[Made2Fade]

Have you assembled the tail shaft correctly? Is the pulley on the correct way? Can you show us a few piccys?
Cheers
Lee

[unwind-protect]

Something you might want to check:

With a lot of tail mechanics, the pitch control arms can be on the leading edge of the blade, or on the trailing edge. Using the leading edge link has a number of advantages, including (usually) a more useful pitch range.

If you look here:

http://www.sportsmoto.co.uk/acatalog/TTTs-silver.jpg

You'll see there's a few degrees of positive pitch applied, even though the pitch slider is more-or-less centralized on the tail shaft.

If this is your tail, and you were using trailing edge control, I can see that you'd have difficulty getting enough pitch to counteract MR torque, let alone turn (BTDT).

(Edit: don't forget to recheck your gyro and tail channel after!)

[Made2Fade]

This was exactly my thought thats why i asked for piccys...
http://www.sportsmoto.co.uk/acatalog/info_905.html
Heres the piccy i was looking at.
Cheers

Lee

[unwind-protect]

Great minds think alike, or something like that

[tourerjim]

I had this with my Mini-T when I first fitted 401, On the 401 leave the single wire unplugged from receiver, Disconnect two motor wires, Switch on radio connect heli and wait for heli to set then adjust tail rotor slider to centre whilst heli is still connected. once you've done that disconnect heli battery then reconnect single gyro wire, reconnect motor wires then plug heli battery wait for heli to set for few seconds and it should be fine.
Just double check that the tail servo is no over travelling for the tail slider.

[tourerjim]

Hi
I have a mini titan and recently upgraded to the bling supplied my Helimoto.co.uk. I think this is made by Sonix. The head assembly is really good but the tail seems to be giving some problems and I am not sure if it is just my setup. When trying to take off I am finding that the nose is trying to turn to the right. With full right stick I am barely able to arrest the swing. What appears to be the problem is that when the pitch slider is in the middle of its travel the pitch on the tail rotor is not enough to allow the heli to hover. It seems impossible to give the required pitch to allow the heli to hover in Normal mode with the pitch slider near the middle of its travel. It seems as if the stock tail drive shaft is too short resulting in the tail blade grips being too close to the slider resulting in too much pitch in the wrong direction. If anybody has any info to help solve this problem it would be appreciated.

Just reading again 'Bling' if memory serve me right the tail rotor kit they do is an all metal charcoal grey if so then it does not suit for Mini_t as I had one some time ago, very hard to centre and not a very good fitting on the carbon booms unless glued.

[andyrauc]

Thanks for all the feedback. I did notice that the trailing edge and the leading edge ws giving a lot more scope for pitch. However when I changed the link from the leading edge to the trailing edge the pitch was so far off that I could not even spool up. I am unfortunatly not in the same country as my heli so will have to check more closely when back home. I will also certainly try the setup with the 401 gyro. Cannot wait to get home. If I have no joy I will certainly post some pictures.

[click]

I've encountered exactly the same problem - and it took me a while to realise what was it!

If it is not too late - what did you do, at the end?

When I tried to change trailing to leading edge it didn't fit nicely and links weren't parallel to the shaft. Do I need to force them?