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Old 11-03-2021, 01:07 PM   #1 (permalink)
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Default What is the best way to adjust flying parameters with forward programming?

I purchased the ix20 and this FC6250HX so I could make on the fly adjustments to the flight parameters of my heli. Now that I have everything setup I have no idea how to adjust the parameters to correct what I think is wrong with my heli, nor do I have any idea what to adjust to make it fly even better. I think Spektrum needs to make this a little more user friendly or at least put a guide in the manual with some tips on how to start adjusting.

I've read through the P I D "Proportional, Integral, Derivative" but that just adds to the confusion. The other confusing part is how far to move the sliders. There is a huge range of potential movement in each of those adjustments.

Heres my problem: If I fly forward flight and pull up into a stall, right when its stalled if I bang the collective back and forth (pitch pump) the heli wobbles on the fore/aft cyclic axis, it almost looks like I'm doing a tic-toc but I'm not. So it seems there is fore/aft cyclic happening when there shouldn't be. My swash goes up and down level when I move collective on the table.

What parameter should I try tweaking and how much value should I go? I'd hate to do too much and cause a problem in the air that may cause a crash. Thanks.
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Old 11-04-2021, 11:00 AM   #2 (permalink)
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Originally Posted by Timbers View Post
,
Heres my problem: If I fly forward flight and pull up into a stall, right when its stalled if I bang the collective back and forth (pitch pump) the heli wobbles on the fore/aft cyclic axis, it almost looks like I'm doing a tic-toc but I'm not. So it seems there is fore/aft cyclic happening when there shouldn't be. My swash goes up and down level when I move collective on the table.

What parameter should I try tweaking and how much value should I go? I'd hate to do too much and cause a problem in the air that may cause a crash. Thanks.
Check CG position first of all.
/A
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Old 11-04-2021, 06:15 PM   #3 (permalink)
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Originally Posted by Timbers View Post
I purchased the ix20 and this FC6250HX so I could make on the fly adjustments to the flight parameters of my heli. Now that I have everything setup I have no idea how to adjust the parameters to correct what I think is wrong with my heli, nor do I have any idea what to adjust to make it fly even better. I think Spektrum needs to make this a little more user friendly or at least put a guide in the manual with some tips on how to start adjusting.

I've read through the P I D "Proportional, Integral, Derivative" but that just adds to the confusion. The other confusing part is how far to move the sliders. There is a huge range of potential movement in each of those adjustments.

Heres my problem: If I fly forward flight and pull up into a stall, right when its stalled if I bang the collective back and forth (pitch pump) the heli wobbles on the fore/aft cyclic axis, it almost looks like I'm doing a tic-toc but I'm not. So it seems there is fore/aft cyclic happening when there shouldn't be. My swash goes up and down level when I move collective on the table.

What parameter should I try tweaking and how much value should I go? I'd hate to do too much and cause a problem in the air that may cause a crash. Thanks.
The settings are no different than any other modern flybar unit. All others have PID, Rotation rates, and so on. I would start with CG adjustment and make sure it is spot on. put the heli on its side, hold the blades pointing up to the sky and down to the ground, with the boom parallel to to the ground it should not move.
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Old 11-05-2021, 01:05 PM   #4 (permalink)
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There is a wide range of adjustment simply because helis range from 2 ounce mosquitos to 20lb+ camera ships. Flying styles, heli size, blade aerodynamics, servos, head speed,....... on and on make for a lot of variations.

If ever in doubt start with small adjustments. In the case of the 6250hx stick to a maximum 5% gain adjustment, test hop and evaluate. The system is pretty forgiving.

Cyclic's, bring p and i up 5% at a time until you are happy with the stability, tracking, follows your inputs and stops well. P and I are generally the same values and aileron and roll are the same values. D, the defaults are good for 99.9% of the models. Once you are happy with the model you can make small adjustments to each gain to determine if there are improvements or not.

If you notice some minor issues on fore/aft stops raising the cyclic pitch d gain a couple of points can help. Generally this is only needed if you have a high disc loading and a very aerodynamically stable blade. The default cyclic d gain settings really do cover 99.9% of the models out there.

Tailrotor, there is a pinned topic up in the fc6250hx forum that covers the topic.

I will try to get a cyclic tuning guide up here soon but the notes above are how it is done. It will be quite a bit shorter than the tail tuning guide.
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Old 11-09-2021, 12:50 PM   #5 (permalink)
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Thanks for the tips I'm going to give the CG a try and then tweak the setting afterwards.

I've never really worried too much about CG on helis since they always seemed to fly fine for me no matter where the CG was at. Unlike planes!
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