only little forward pitch in stable mode?

[Hamburger]

Hi,
on my medium TRI with the latest r190 MultiWii I experience curious behaviour:
sensors are calibrated with TRI on level table.
but when flying in level mode, I get way less forward pitch than I can get backward pitch. So I could fly faster going backwards.
But what could cause this? The copter has quite some thrust, so it is not related to maxthrottle? The effect can be seen when pitching from a stable hover. The TX is setup to 125% in all directions. I am afraid to try this in acro mode, so I cannot comment on that. Any ideas?
Which parameter would increase the maximum tilt angle in level mode - even if I do not need to increase the backward pitch I could live with that?
Hamburger

[Alexinparis]

The angle is tied to rcrate.
rcRate=1 should give a 50 deg max angle.

it's defined in this formula: errorAngle = rcCommand[axis] - angle[axis];
angle[] is 10 x real angle in degree
and rcCommand range is [-500;+500] with a rcRate=1

the asymmetric attitude is strange

[Hamburger]

thanks. Will hopefully find time tomorrow to try it out before holiday.
Hamburger

[dodecopter]

the asymmetric attitude is strange

on one of my quads i have exactly the same problem. forward pitch is much less than backward.

it occured when i switched from a turnigy 9x (which worked as it should...) to a cheap HK 4 channel Tx/Rx mode1. after changed it to mode2 that behavior occured.

in my case it seems to be less throw on the right stick above middle position 1500 (full way is 1050 to 1790, middle IS ~1500). maybe its a bad poti in my Tx, or its fitted in wrong..

[Hamburger]

the asymmetric attitude is strange

and it still happens with this one TRI.
It calibrates ok on a flat surface and stable flat orientation is ok after launch. When fighting wind outside, the neutral position 'shifts' to a backward tilt of approx 20 degrees.
As this does not occurr with any other of my TRIs, I am pretty sure it is not the TX (dx6i).
It is with r190, so I could/should probably upgrade but maybe this does trigger someone's memory for an explanation?
The TRI has WMP and BMA020 sensors.



Thanks, Hamburger