T7CHP programming

[Lucky Seven]

I have an HDX450SE and a Futaba T7CHP radio.

I am having issues with the settings for the Throttle and Pitch curves. I originally set them (per Finless video) at: 0, 25, 50, 75, 100.

The heli was extremely sensitive and would fly away on throttle up. :arggg:

I have changed them so it is controllable but haven't been able to get into a smooth hover (playing with numbers). I would like the expert's opinions on the correct curve settings.

I'm looking for something to get me hovering easily. I'm still way too new to try much else.

Thanks for any help / recommendations.

L7

[delamar]

Dial in lots of expo. reduce the swash mix for pitch.

[DavidH]

Lucky,
Yes you set the pitch curve 0, 25, 50, 75. 100 and found it very sensitive.
How did the degrees of pitch match up with the settings above? How many degs of pitch you have at 0, 50, 100? Pitch curve settings are useless unless the mechanical pitch settings match them as they are suppose to.

A linear pitch curve ( 0,25,50,75,100) is what you need. You just have to match the mechanical pitch curve to it.

David

[spork]

I'm not sure where you are in N. CA, but if you're anywhere near Mtn View I'll be glad to help get you pointed in the right direction.

[Lucky Seven]

Lucky,
Yes you set the pitch curve 0, 25, 50, 75. 100 and found it very sensitive.
How did the degrees of pitch match up with the settings above? How many degs of pitch you have at 0, 50, 100? Pitch curve settings are useless unless the mechanical pitch settings match them as they are suppose to.

A linear pitch curve ( 0,25,50,75,100) is what you need. You just have to match the mechanical pitch curve to it.

David

The above settings gave me -14 to +14 pitch on the blades. It was zero at mid throttle.

The pitch appeared linear but was so drastic that the heli was just not controllable (for me at least).

I have changed them around and it is less "touchy" but I'm looking for what it should be vs just guessing.

[Lucky Seven]

Dial in lots of expo. reduce the swash mix for pitch.


Wouldn't lots of expo make it more sensitive?

[Lucky Seven]

I'm not sure where you are in N. CA, but if you're anywhere near Mtn View I'll be glad to help get you pointed in the right direction.

I'm about 3-4 hours east of you. If I can't get this worked out perhaps I could call you on the phone. :dontknow

[spork]

I'm not sure where you are in N. CA, but if you're anywhere near Mtn View I'll be glad to help get you pointed in the right direction.

I'm about 3-4 hours east of you. If I can't get this worked out perhaps I could call you on the phone. :dontknow

I'd be happy to try and help.

[DavidH]

Lucky,
There is a choice of three things you can do.
You can go in some on the servo wheels/horns that control the collective. Moving towards the center will reduce pitch travel. If it is eCCPM you will have to do this on all three servos. If it is just one servo controlling the collective go in on that servo.

If it is 120 eCCPM. go into the swash menu and reduce the AFR on the pitch channel. For example if it is 60 make it 50. This will reduce collective travel. I would reduce it till you get about +10 to -10.

With the -14 to + 14 you have now. The stick only has to be moved a small amount for the heli to go up or down. The idea is to get the collective range as small as possible and still have the range needed.


David

If it is mechanical one servo controls the collective. Go to Channel 6 EPA or ATV and reduce the points on each end till you get about + 10 to -10. Full top stick is controlled by one end of the EPA or ATV. Full bottom is controlled by the other end.
They should be 100 and 100 now. Try reducing them to 80 and 80 for an example.

[Lucky Seven]

OK!!!!

I let a friend of mine play with it. He changed the pitch curves so that I have -1 at the bottom and +8 at the top. Also returned the throttle to 0, 25, 50, 75, 100.

Then we played with the expo until we settled on -15 was the best for now.

The pitch curve ended up being nowhere close to what I would have thought, or had it set at.

It now flies and hovers quite well!!!! :glasses2: :mrgreen: :smokin:

Thanks to everyone for the help. :noteworthy :noteworthy

[spork]

If it works for you that's what matters. But some of those numbers seem a little surprising. Some like the assymetric pitch for learning, but others (more common these days) think it's best to set your hover at 3/4 stick right from the start (so there's no re-learning it). Also, with electric motors we usually end up bringing it up to speed quickly and keeping it there. Something more like:

0, 50, 75, 95 100

But do what works best for you.

[Lucky Seven]

Rick,

Considering how difficult it was to control I am going to have to go with this for now. Once I get a little better I plan on changing it to something more "normal". I was out this afternoon after work hovering, turning, and of course getting over confident and crashing. But, I was able to fly which I was not able to do with the previous settings. (0, 25, 50, 75, 100, on both pitch and throttle).

I am open to suggestions and will try changing the curves once I am able to fly as well with the heli as I can with the simulator.

Thanks for all the suggestions and help. I'm sure I will need more before I'm done.

:dontknow

[spork]

...will try changing the curves once I am able to fly as well with the heli as I can with the simulator.

That will never ever happen. We could all win the Nats on our sims. But that doesn't matter. If the heli is doing what you want it to do, it's right for now.

[Lucky Seven]

...will try changing the curves once I am able to fly as well with the heli as I can with the simulator.

That will never ever happen. We could all win the Nats on our sims. But that doesn't matter. If the heli is doing what you want it to do, it's right for now.


Thank-you sir. (You are right...I will probably never be as good on the heli vs the simulator)!

:shock: