Why 75% rudder for DX6i?

[deadram]

I'm wondering, does that 75% just make the rudder less responsive, or is it because of power limits to the motor? If I up it to 100%, obviously more voltage should end up at the rudder motor, but can the rudder handle that power?

More thinking along the terms of modding, and upgrading the tail rudder motor. Like tossing in something more powerful, and changing the limits on my DX6i to 100% to get more response. If I can just change the limit, and not worry about changing the tail rudder motor, that be best though

If the book says 75%, then I'd guess I'd lose right spin and only get more left spin out of a 100% setting. Anyone care to pipe in and knowledge me up

[Imzzaudae]

I don't see where you got the 75% value from for rudder.
I run my rudder at 125% in the travail adjust menu and 100 no expo in the DR/Expo menu.
This will give it a little more authority.
Make sure you set the endpoint 125 both sides of centre stick.
See arrow on travel adjust menu!

Hope this helps you!
Ron

[motoracer5]

I think he has rudder and pitch mixed up. 75% pitch is probably recommended for a few reasons, motor power being one of them.

[tyoung560]

I'm pretty sure the manual recommends 75% for the rudder...could be wrong tho

[Liduno]

Just looked at the pdf manual and it says 100% for rudder and 75% for pitch.

[Talesin]

Yep, 100% rudder in the manual.
And I'm still using 68% for pitch instead, just to help cut down on TBO a little bit.

[poulsbobill]

Negative expo on the rudder will make it feel a little more responsive too.

Bill

[Tasteles]

I like to run the limits on the rudder turned up all the way and also D/R turned up all the way on rudder. Makes for a reallly responsive rudder.

[spykez]

Originally Posted by deadram

I'm wondering, does that 75% just make the rudder less responsive, or is it because of power limits to the motor? If I up it to 100%, obviously more voltage should end up at the rudder motor, but can the rudder handle that power?

More thinking along the terms of modding, and upgrading the tail rudder motor. Like tossing in something more powerful, and changing the limits on my DX6i to 100% to get more response. If I can just change the limit, and not worry about changing the tail rudder motor, that be best though

If the book says 75%, then I'd guess I'd lose right spin and only get more left spin out of a 100% setting. Anyone care to pipe in and knowledge me up

You've got your numbers slightly mixed up.

In any case, the rudder absolute travel on your DX6i actually influences your yaw rate. So the higher it is, the quicker you will yaw for a given rudder input. Basically you adjust it to taste but generally people tend to try and get their heli's yawing at a symmetrical rate. 75% I would find way too slow.

The 70 plus values are for the collective pitch travel. More pitch - more power consumed by the main rotor - it has to do more work.

The trick is to dial enough pitch so the heli is fly-able without the tail losing power and blowing out, as the main rotor power consumption goes up with more pitch.

So... if you put an extremely powerful and less efficient (hungry) tail motor on, you might actually exacerbate the issue.

What values to dial in? There's nothing very exact on the collective travel I'm afraid, it's a matter of trial and error. 70ish is usually a good place to start. You might be able to go up, but you quite possibly need to go down.

To improve your flight experience:

1. If you extend your tail with the stock motor, you'll make it more efficient in countering torque at the expense (usually tolerable) of mass and center of gravity. The heli is still fortunately still flyable a little tail heavy. Actually I'm *still* pretty amazed at the abuse this heli can take and still fly. But naturally there's a point where too long a tail is just bad. Get the stock eflite one, it's pretty good with a stock motor.

2. More efficient main motor ie BL mod.

Don't forget to get some somewhat decent lipos - nanotechs are cheap and at least for now I've not found anything better in terms of bang for buck.

[deadram]

Yes, my bad, should have said pitch. I've actually noticed more tail blow-outs as the battery drains. Definatly going to get a better battery in there soon. Thanks for all the info too, would have been my next few questions anyways

[Liduno]

Originally Posted by spykez

You've got your numbers slightly mixed up.

In any case, the rudder absolute travel on your DX6i actually influences your yaw rate. So the higher it is, the quicker you will yaw for a given rudder input. Basically you adjust it to taste but generally people tend to try and get their heli's yawing at a symmetrical rate. 75% I would find way too slow.

The 70 plus values are for the collective pitch travel. More pitch - more power consumed by the main rotor - it has to do more work.

The trick is to dial enough pitch so the heli is fly-able without the tail losing power and blowing out, as the main rotor power consumption goes up with more pitch.

So... if you put an extremely powerful and less efficient (hungry) tail motor on, you might actually exacerbate the issue.

What values to dial in? There's nothing very exact on the collective travel I'm afraid, it's a matter of trial and error. 70ish is usually a good place to start. You might be able to go up, but you quite possibly need to go down.

To improve your flight experience:

1. If you extend your tail with the stock motor, you'll make it more efficient in countering torque at the expense (usually tolerable) of mass and center of gravity. The heli is still fortunately still flyable a little tail heavy. Actually I'm *still* pretty amazed at the abuse this heli can take and still fly. But naturally there's a point where too long a tail is just bad. Get the stock eflite one, it's pretty good with a stock motor.

2. More efficient main motor ie BL mod.

Don't forget to get some somewhat decent lipos - nanotechs are cheap and at least for now I've not found anything better in terms of bang for buck.

You can fix the COG by cutting the tabs off the side of the battery, it allows the battery to slide a little further forward to counter the longer boom.

And hyperion 250 mah batteries are a great battery too.