hubsan x4 brushless mod?

[litehawkdown]

I hate brushed motors. So I am going to try a 1s BL hubsan x4 fpv. Anyone try this before? I am using 4 3amp esc's flashed with blheli multi rotor and 4 12000kv tail motors. I think it should work seeing as my tails on my MCPX's seem way more powerful that the hubsan stock coreless ones with the same props.

I had to order the ESC's and two more motors. So my project is on hold till everything arrives.

Oh and I can not believe on bought a friggin quad copter. I did it for the FPV I sware. Lol

[litehawkdown]

Well all my stuff is here and I went and soldered everything up.

For the record I have used BLheli to convert UM planes and helis many times now with no major issues.

On this build everything fires up ok and I get the initial 3 tones. But I can not get the ESC's to arm

I am using the MX 3amps esc's flashed with XP 3amp multi firmware. http://hobbyking.com/hobbyking/store..._3A_Mi_3A.html

With the 12000kv motor.http://hobbyking.com/hobbyking/store...trSearch=12000

The Hubsan 107D board. new version.

Things I tried..... Rerouting power. Using the same esc that is not flashed with BLheli. moving signal input from motor + to the resistor before the fet. Playing with settings on BLheli........

I am wondering if the signal frequency from the hudsan board is just not up to the task? Or if the 107d TX is not calibrated for proper end points? This is the first I have ever ran into this problem. Also the first time I tried this with something other then my DX7S. The motors do nothing at all but beep 3 times when the battery is plugged in no matter what I do.

Any ideas?

[litehawkdown]

I got the bugger to arm by switching back to the resistor instead of the motor + plug. But it stared to beep like mad at me. think I had some crazy settings set to it. Back at her.

[litehawkdown]

Ok seems this thread is as popular as Ebola.

So I got it all working. Soldered back to the resistor. Got rid of the XP 3amp firmware and flashed the supermicro 3.5 amp instead.

But here is my new pickle. Anyone know how to tame motor inputs without a Throttle curve? Right now I get full power at less then a quarter stick. kinda makes It crazy to fly like that.

[litehawkdown]

Figured that one out too. I had the TX stripped apart as I thought I was not hitting the proper end points do to mechanical obstruction. It was messing up the arming sequence once I had the proper signal from the flight controller. After putting the tx back together throttle input actually works as it should. Now begins the fun of figuring out what input runs which motor. Lol think I have 1 right out of four. I will post a pic of the solder points for the signals in the first sticky as soon as I confirm how it works.

[litehawkdown]

Link to solder points and what signal goes where.https://www.helifreak.com/showpost.p...postcount=3497

[Mugen2008]

Just ran across this thread... You're right... not very popular. I'm interested though. Did you finish the project? Have any more photos or videos?

[litehawkdown]

Originally Posted by Mugen2008

Just ran across this thread... You're right... not very popular. I'm interested though. Did you finish the project? Have any more photos or videos?

I have been posting progress in the hubsan 107d thread on RCgroups due to the lack of replies here. I went 1s with the 12000kv MCPX BL tail motor. It was not enough kV seeing as the stock brushed motors are 13000 kV. I am using a light weight frame I made myself with no FPV gear. It hovers and fly's well and fast. But it could never lift FPV right now and it has a hard time with recovering from multiple flips. It needs more RPMs or bigger props. Right now I am running the ladybird props. It runs for 10-12 minutes though. I could rewind the motors to get higher kV which I might do. But first I am going to try some bigger props (Parrot rolling spider). Then maybe the super x props?

If you are going to try it I would go 2s or 3s and isolate the flight control board on 3.7volts. It would leave more room for adjustments if needed.

That said after I started this oversky released the hermit quad. 2s BL think it is 150mm motor to motor. Can run on 3s too I think. $ 300 for the kit with fpv gear and $200 without. Might be worth looking at.

[ferdinandus]

Interesting project,

I have more clear ideas now for the conversion to brushlles of a JJRC quad. It has hubsan controller inside also, and same similar FET's.

The question that is not clear for me yet. Regarding BHheli ESC's out there, can i feed the pwm signal directly to them through signal cable of the ESC, or additional mods are required in the esc (supposed to have BHHeli firmware).

Thanks,

[litehawkdown]

That is the beauty of Blheli. It converts the signal for you so you do not need a signal converter.

[ferdinandus]

Thanks a lot for your anwer here and PM.

I will look for inside the BlHeli sticky.

Regars,