First Quadcopter build Problems!!

R

reillyryan

Member
Hey guys Im new here and this is my first time posting, read a lot, but first time posting.. Ill try to be quick and to the point of with my problem and questions.

So I just built a quadcopter:

S500 PCB Frame (all power is soldered to the board)
DJI e310 tuned propulsion system
Xaircraft Minix FC (do not have the OSD connected since Im not doing any video)
Futaba 8JA(set in quadcopter mode, apparently new, had to revers all the stick channels) with Sbus Reciever

So put it all together. did all the programming and calibrating I knew of. Everything seemed to connect.. Was able to get the quad off the ground, in attitude mode, minimal flying in close range, no problems, then flew further out and higher, then the quad just fell out the sky, as it was falling I could here motor trying to do something, but wasn't able to recover.. Got the quad back together, did a lot of testing this time. What I am finding now is that.. while in manual mode holding the quad in my hand the motors spinn up and spinn down correctly, seems to be all good, did notice that yaw in one direction is almost not there at all.. but have not flown it in manual mode.. Did the same test in attitude mode the motors are very iffy in response, when I arm them they spinn up to where ever the throttle is, but then start to slow down to were only one motor is spinning, when I try to throttle up at that point again the motors are very unresponsive and will almost do nothing.. This was me holding the quad and just sitting on the ground, giving enough throttle to spinn up but not take off.. now in attitude mode I can get it off the ground hover at various altitudes, but after giving input on the sticks the quad becomes unstable in a manner of speaking, it will sometimes drop altitude very quickly for a brief moment, which it can recover from, then some times with the throttle above or at 50% will slowly loose altitude till it hits the ground.. At a level hover.. Giving positive throttle at this point either spinns the motors up to gain altitude or it does little to nothing.. This is also something I have noticed that at various time giving stick input there is a brief hesitation or lose of input to the quad, its very odd to me.. It will fly very level and stable sometimes , it almost seems that as long as I'm giving constant stick inputs if fine, but when I try to level off or slow down is when the problems happen.. Again all this seems to be in attitude mode, haven't done gps mode fearing that if it cant handle attitude mode then gps wont be any better.. I have tried all the calibrations:

esc calibration and esc firmware upgrade
neutral point calibration
reverse calibration
compass calibration

Just really lost and need some help.. Hope what I wrote is understanble and clear, if not let me know
 
IDK for your FCB(flight controller board), but many have it in the settings. I'll check it out, do you have a NAZA?
 
There may also be a spin on arm option, or stick scaling could be called: throttle curve or expos.

Are you sure you did not loose signal, and are you flying in a city?
 
GJH105775 said:
There may also be a spin on arm option, or stick scaling could be called: throttle curve or expos.

Are you sure you did not loose signal, and are you flying in a city?
Click to expand...

I have the Xaircraft minix FC, I'm only flying it right in front of me in almost arm reach just in case.. clear line of sight to the quad.. The first crash I had was a little further away, but still in eye sight and in an open field. I do know what you mean by throttle curve and expos, and I have kinda played with that but still have the same issues.. I did a little more testing last night and like I mentioned before, holding the quad by hand so it wont fly away, I tested stick movements to see how the quad reacts.. What I saw last night was for instance i can can move a stick in a direction and sometimes the quad responds and other absolutely nothing happens, if I keep moving the stick It will eventually respond but still not like I believe it should.. Also noticed that for instance on the elevator and aileron stick (mode 2 transmitter = right stick) which is spring loaded (you know when you let go it snaps back to center) if for instance I push that stick left or right, the motors respond but when I let the stick go and it snaps back to center, the motors don't slow down to level off they continue to want to carry the quad in the direction I had pushed the stick before I let go.. Another thing Ive noticed is if I throttle up and bring the quad to a certain level altitude and let it sit for a second then try to increase the throttle to bring quad up more, for a brief second as I initially throttle up more the quad drops for a second then begins to throttle up..
 
Interesting, definably a nice Tx, and certainly RF. Maybe contact the place you got it from? The sticks should not be grabbing. Have you used this tx on other models?
 
GJH105775 said:
Interesting, definably a nice Tx, and certainly RF. Maybe contact the place you got it from? The sticks should not be grabbing. Have you used this tx on other models?
Click to expand...

Yea, Im in the process of contacting futaba.. and no this is the only one I have tried it on, but I was going to try over the weekend to bind to a friends quad.. now idk if technically the sticks are grabbing or because I was holding the quad while testing it and that makes it react that way vs how it would react if it was in air, but I still feel that regardless either way the stick and movements should respond the same whether its in my hand or on the ground..

I was thinking of connecting the esc directly to futaba receiver, (like you would for esc calibration) but I have read that that can be harmful to the receiver due to to much power input, idk if that true or not, but that way would cancel out the FC and to tell me if the transmitter/receiver setup was functioning correctly since it would be a direct connection ( i calibrated escs one at a time to the receiver)

I thought that maybe the initial crash was the cause of all of this but it was doing similar things prior to the crash.. Its frustrating because the Minix FC has a black box to record whats going on, but apparently mines not working.. never anything the log folder for the black box..
 
Flight Controller System
The Flight Controller is the core of the system and is
connected to GPS/compass and RC receiver for flight. It
also has the black box flight data recording function which
maintains the flight records for 40 minutes allowing users
to view and share flight record
 
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