Heli 120 Swashmix issue

Have you seen this? No idea if it will help, just came across it.

www.rcheliwiki.com/CCPM_layouts

and this: www.slyster.com/heli/mix.html

cheers
Graziano

Hi,
I've reinstalled the Walkera Devo 10 firmware to see how works the swashmix.
It works exactly like the one on the WK2801 , there is no normalization factor.
I really would like to know how work a Spektrum?

To see if there is a renormalization factor it's easy.
On a 120° (or 140°) 3 servos CPPM Heli, configure your swashmix to 10/10/10%, take a look on the TX monitor channel (if any) or on the cyclics servos.
Move the sticks to the limits to determine the Max and the Min values of each cyclic servos (channels on monitor).
Then configure your swashmix to 60/60/60% , and look again to your cyclic servos (channels) Min/Max values. If those values are exactly the same in both configurations, there is a normalization factor.
If Min/Max when swashmix is set to 60/60/60% are higher than when the swashmix is set to 10/10/10% then there is no normalization factor.
Thanks

Hi

tested now with a spektrum DX8i.
With swashmix 10/10/10 the monitor display +- 9% on the corresponding channels. With swashmix 60/60/60 the Monitor display +- 50 %.

cheers
Graziano

Just for confirmation... The Dx6i monitor doesn't display numbers, but it looks very close to the DX8i numbers posted above.

Hi all

i have build a dfu with the removed normalization factor.
Now the swashmix works very fine!

I have tested only indoor (we have snow in switzerland),
and my T-Rex 250 hoover like a charm !

Thanks' PB !!!


cheers
Graziano

Hi,
I don't think that a normalization factor set to 60 (as in latest PB release e3af386 ) is a good value. I think that 100 is much better.

I will try to explain (again sorry for frenglish).
Imagine I set my swashmix settings to 50/50/50% ... No I push the ELE stick
full forward. How will move my servos (if of course I set all curves to 1-1)?


aileron = Model.swashmix[0] * aileron / normalize;
aileron = 50*0/60 = 0

elevator = Model.swashmix[1] * elevator / normalize;
elevator = 50*100/60 = ~80;

collective = Model.swashmix[2] * collective / normalize;
collective = 50*0/60 = 0;

and the ouputs

cyc[0] = collective - elevator = 0 - 80 = -80;
cyc[1] = collective + elevator/2 + aileron = 0 + 40 + 0 = 40;
cyc[2] = collective + elevator/2 - aileron = 0 - 40 + 0 = 40.

I think, this is too much... with this factor the max outputs values will be:
+-160 for ELE , +-200 for COL and AIL ! Remember that, when setting swashmix to 50/50/50% on a WK2801/Devo X the max outputs are +-100 for ELE , +-125 for COL and AIL.
With a normalization factor set to 100 ,the max outputs value will match exactly the WK2801/Devo X values.

Thank you very much!