DX6i mixing

[Danjr1]

i think this is a common problem but i am wondering if people can help me with it. Im using a DX6i with the ELEVON option selected. To counteract the 50% throws and get full speed/ power, ive used the following youtube tutorial:

The bot, which uses two self-hacked 85a ESC, works perfectly fine until for example you push the stick above 75% forward and 75% left, expecting the bot to start turning as the left side of the drive slows down and letting the right side bring the bot around to the left. At the moment, its doing the opposite in this situation and bringing the bot around to the right. it works as intended at lower speeds and when using the ELEVON option on its own without the messing with the 50% throws.

Cheers

Dan

[Danjr1]

Hi everyone,

Ive now tried everything to sort this problem and made little progress. The Botbitz ESCs shut down if the travel signal goes over 100% (i dont see why it couldn't have been programmed to just stay at 100% instead of doing that but anyway) and when i use the mixing above in the DX6i, it sends the travels way over this. Using the travel adjusts doesnt seem to limit the mixing for some reason. All this has been tested on a brand new Tx which i bought today.

I've tried the hobbyking T6A-V2 system which the botbitz ESCs were built around but there is no way of telling whether the motors are going 100%. The mixing on them is a little obscure as well but i was able to use the system at Burgess Hill but it really bugged me that i never knew if it running to its full potential.

If anyone else out there uses a DX6i and botbitz ESCs, may I ask what mixing you are using?

Also, what other Tx, Rx and maybe external mixer set-ups people using with the botbitz ESC which seem to work fine? (failsafe, doesn't do anything crazy with the mixing etc)

Cheers

Dan

[Ellis]

A fairly crude way to know if you're running the motors at 100% would be to put a battery onto them directly, listen to the tone, then do what should be full throttle on the tx and see if there is a marked difference in the sound.

[Danjr1]

Tried that and it's very difficult to tell the difference. I also tried putting a multimeter on the motor terminals to compare the voltages being sent to the motors but at the higher end of the throws, it goes crazy and can't seem to measure it. What Tx and Rx set up do you use on Tormenta 2?

[Ellis]

If you can't tell the difference in tone between the battery directly onto the motor terminals and going full throttle at the transmitter then chances are you are getting 100%.

We use a Planet 5 transmitter and receiver kit, a v-tail mixer, and the Botbitz. Very simple, only complaint with the tz85s I suppose is that when you put the stick fully into a corner of its travel, it doesn't move. I assume this is some sort of mixer+tz85 combined issue as it didn't happen when we used to run electronize. It's not a problem in the arena, really, as you rarely want to do donuts anyway. :P

[Eventorizon]

We use DX6i's and Botbitz on both our machines. As I said before, the only issue we have is that it goes faster one way than the other.

The mixing is set to Elevon. We have one channel reversed as I prefer to wire up my motors so that I have the positives on the same edges as the motors so It makes it easier to see the flow of power through the machine.

The Big Nipper guys messed with my TX at GSL to sort the speed issue with Conker but that was it, Speed only.

Try rebinding the RX with everything reset to defaults then edit from there. If you edited before had then it could have given the RX and ESC's false centre points or something... no idea really, just a thought.

[Danjr1]

Using purely elevon on a dx6i limits top speed in forwards and backwards directions to 50%, and will only reach 100% if spinning on the spot which on a rambot isn't what you'd want. It might be that I may have to upgrade my Tx to a more adjustable unit.

[plargen]

you could just get a v tail mixer there not expensive, i use the cheap ones and havent had any problems but i dont use the tz85 esc

[Shakey]

You can't directly measure the voltage out of an ESC as they don't vary the speed of the motors with voltage they vary it with switching. So they pulse the motor with full voltage at different frequencies to achieve the equivalent power input. So no matter what speed the motor is doing the voltmeter is reading full battery voltage being switched between 0 and full constantly.

I have one of the older DX6i's but I've not seen this problem before always getting 100% output in turning or forwards/backwards!

[Danjr1]

Been doing some research into all this. The only way to get proper mixing like you'd want on a bot would be to use a Spektrum DX8. The Hobbyking set is a bit better in terms of the mixing.

I'd love to use a v-tail mixer but dont people have issues with them at the higher ends of their throws like Ellis said?