- Drone weighted down during the throttle calibration process; no fear of a flyaway with that hunk of rusty tube threaded through the landing skids.
Calibration of the throttle completed and the rotors now throttle up normally but after the session we check and find that throttle calibration may be required at the beginning of each flight now.
CX20 not lifting off Posted by Rob Nielsen on February 20, 2015 at 2:15pm in QuadcoptersView Discussions I just got my CX20 yesterday, I have been reading up on all the details and quirks so I was ready for it's arrival. I did a complete inspection of the interior components (ensuring I had disconnected the magnetometer in the mast). Everything is secure and in it's proper position. all solder connections seem sound. APM and GPS are in place and secure (they are mounting the GPS on the opposite side from the USB now). I reassembled everything and reconnected the Mag. Checked the propellers for balance. By this tiem the stock battery on the stock charger was completely charged. I updated the firmware and made sure it knew where home is in the Mission Planner software, as well as did a full calibration of accelerometers, Mag and transmitter. Propellers on their proper arms. All set to go. Ok time to fly. I take the unit outside. connect the battery, switch on the TX. The system binds as it should. Everything seems good. I have a solid green (Sats visible). I unlock the motors and try to take off. the moment the throttle leaves the full off position, the motors kick in at moderate revs, not enough for liftoff but flattening the grass. The unit leans forward so i pull back on the cyclic (right stick) to compensate. As i rev to max throttle, there is not difference in the RPM of the motors. At 0 throttle it is off, at 1% and up it is at a fast idle, not enough to take off. If i move the cyclic, i can rock it side to side and front to back, but it doesn't have the power to liftoff. similar to and ICE with the choke applied. I have gone through every permutation of the calibration routines from the incorrect factory ones to the ones used by people who fly this unit successfully many times over. I tried the all at once ESC calibration but this seems to not be the APM that works with that method. The only thing I can think of is doing a manual 'one at a time' ESC calibration but at this moment I am waiting for word back from the supplier. I have been waiting for a while for this to show up and now I am waiting with the thing right in front of me. it's pretty frustrating as you can imagine. Great weather and I can't fly it. FPV and telemetry gear on the way for it. ARG! If anyone has some good suggestions, i am VERY eager to try them. Flying the little Walkera and the Syma is getting old.
Suffice to say that I have been having this very same problem and I could not have explained it any better myself. It has been a very frustrating series of experiences that I have been having ever since I became risky soul by updating firmware for my drone using the Mission Planner Graphic User Interface (GUI). Those sessions left my Cheerson CX 20 with Throttle settings of 200 when the default value is 1000, rendering it incapable of flight. Several flip-overs later the USB port has been damaged will no longer talk to my computer so you can imagine how excited I was to discover this YouTube video which carefully explained how to re-calibrate the drones throttles using only the controller (transmitter). In my case I didn't even have to remove the blades; I simply slipped a heavy length of steel through the landing skids and carried out the procedure exactly as explained in the video.