trex 450 dfc tail binding

[richieg098]

Hey guys anyone got any advice on this, I've finally got around to setting up my 450 after new servos. Setup was done on k bar (mini v bar clone) got all the way to the tail and the values are a bit low recommended between 80 -110 less than 80 to ball links to long more than 110 ball links to short. Problem is my readings are 74 both left and right. Left input on sticks no problems right imput binding happens. I've tried shortening the ball links but now I have way to much tail pitch not the recommended 2-3 degree. I'm stumped anyone please got any ideas what I can try. Any advice greatly appreciated

[Granpappy]

Have you got the TR pitch change horns on the TR Blade leading edge with anti clockwise rotation looking in from the right side. It's easy to flip them round the wrong way which will give you some problems.

[richieg098]

Not sure what you mean TR. The heli is as it was when i got it and flew perfectly untill a slight mishap getting to close to the cuirtains at the club which resluted in broken skidds gears gone on pitch and ail servos, rebuilt the servos but motors had gone also. new set of servos required as ds415 are discontinued so ahd too replace all three. ive not touched the tail blades so no chance of them being backwards and was flown and setup up by one of the guys at the club.

Have you got the TR pitch change horns on the TR Blade leading edge with anti clockwise rotation looking in from the right side. It's easy to flip them round the wrong way which will give you some problems.

[chrisleematt21]

TR = Tail Rotor?

[Rob Barnes]

Can you do some pictures please , I always set my centre tail pitch to 1 degree and then adjust end points from there.

[myxiplx]

Hey guys anyone got any advice on this, I've finally got around to setting up my 450 after new servos. Setup was done on k bar (mini v bar clone) got all the way to the tail and the values are a bit low recommended between 80 -110 less than 80 to ball links to long more than 110 ball links to short. Problem is my readings are 74 both left and right. Left input on sticks no problems right imput binding happens. I've tried shortening the ball links but now I have way to much tail pitch not the recommended 2-3 degree. I'm stumped anyone please got any ideas what I can try. Any advice greatly appreciated

I assume you mean your endpoint values are a bit low. To increase these you would need to move the ball in one hole on the servo horn, that means the servo has to travel further to get the same amount of travel from the tail, and will increase the numbers slightly.

When you say you shortened the ball link, I assume you mean the long pushrod link between the servo horn and the tail mechanism? Shortening this changes the offset for the tail blades, which as you say will change the tail pitch, but it won't affect the numbers as the distance the servo has to travel is still the same. What it will do though is affect the servo end points, these need adjusting any time you change this link.

I suspect this may be the cause of the binding you now mention when you go right on the sticks, but do you mean it's sticking, or it's pushing against the limit of travel. If it's against the limit of travel then you need to reduce the endpoints in the setup to prevent it moving too far, otherwise you're going to be straining the servo every flight and could easily burn it out.

My advice would be:
- Move the ball on the servo horn in one hole
- Adjust the length of the tail pushrod so you have the recommended few degrees of offset on the blades at mid-stick
- Adjust your endpoints so that you have full travel either way but no binding at the limits