Motor Speed Problems

[keukpa]

Hi All,

I've got myself a Crius Multiwii SE v1.9 and I've managed to fly this quadcopter quite well (see: http://www.youtube.com/watch?v=zsz1XC24m4I ) seems to fly kind of OK, so I thought I would start triming and tuning everything.

When I connect the board to the GUI I've noticed that when all inputs (YAW, ROLL, PITCH) are level at 1500, when I increase the throttle, the motors don't all increase at the same rate, infact the REAR_L motor hardly gets any speed increase at all. From the baseline (idle) of 1200, this particular motor doesn't get post 1300-ish.

The quadcopter is level, the sensors are calibrated.

Does anyone have any idea what could be causing this?

Many thanks,

Keukpa

[copterrichie]

Does this happens with the ACC ON, OFF or Both?

[keukpa]

How do I turn off ACC? It is currently on, but if I click on it, it doesn't turn off!

Keukpa

[keukpa]

Does this happens with the ACC ON, OFF or Both?

Hi,

when the ACC is ON, it is really bad.

when the ACC is OFF it is MUCH better but still not perfect....

any ideas?

Many thanks...

Keukpa

[copterrichie]

First, calibrate your ACC and you may need to recalibrate your gyro depending on how you powered up the board. It has to be perfectly still upon power up or you can use the stick to calibrate it too. Once you have calibrated the ACC, you can try trimming it like shown in this video.

http://www.youtube.com/watch?v=knagzCgXGEg

[keukpa]

Many thanks!

That seems to be just what I need. Although my TX doesn't seem to go above 1850, so I can't get to the 1900 limit needed to activate the calibration trim!

Cheers,

Keukpa

[copterrichie]

Search around, there has been lots of discussion about how to do this. All I know to do is to go into the transmitter and set the endpoints to maximum.

[bill516]

Towards the bottom of the config.h file is an option to increase max throttle to 2000, in the section titled special throttle settings.

[keukpa]

I believe my transmitter doesn't have the stick range. It is just a cheap ESKY 6 channel. Would this alteration fix this?

Still, I have a decent JR transmitter I've used, and all set up and tuned nicely

Thanks for all the help and advice!

Keukpa

[tovrin]

my TX did not have endpoint adjustments either, you make the change in the main file

Code: Select all

// ******************
// rc functions
// ******************
#define MINCHECK 1175
#define MAXCHECK 1840

[copterrichie]

I THINK the ESKY is just a rebranded system that uses T6Config.

http://www.mycoolheli.com/t6config.html

[tovrin]

mine is an ESKY 6 channel as well, I think your right about the rebranding, will test that with mine, but i do not know where to find this fancy cable to connect it to my laptop. great writeup too, if i owned a helicopter... lol