Let me start off by saying I have been searching the discussion boards for some time now and have now found many if any that are building large Quads using the Pixhawk and the U8 Tiger motors. I am a bit of an overachiever and and wanted build and efficient UAV with long endurance. I have put together one using the following equipment.
1200 mm motor to motor frame.
Pixhawk Flight controller.
Castle Creations 50A ESC's
6s 15C Lipo Battery
U8 Tiger Motors
28" Tiger Props
Taranis 9XD Radio
Here is my problem. I have gone through all of the calibrations from the flight controler, motors, ESC's and the radio. When I calibrated the ESC's by using the flight controller bypass the motors spin up in reasonable increments as i increase the throttle. When I arm the system the motors begin to spin at an idle speed. When I try to increase the throttle there is no change in response from 0% to about 60%. At that point the motors spin at 100% RPM from 60% to 100% throttle. I have contacted 3D Robotics and the technician told me that he would speak to their engineers and contact me back. I know I am impatient but a week later I still have not answer. I am hoping that someone here can lead me to a solution. I am thinking that there may be some problem with the flight controller.
Thanks in advance
Will
Replies
I have a hex with Castle 35's. Could you describe in a little more detail how you went about adjusting the receiver endpoints and any other changes you made to the Castle's please? When I tried to do an all at once esc calibration, there was no tone at the end to signify success.
Thanks,
Bernie, if you are using the 35 Amp Multirotor ESCs they have fixed endpoints. The normal all at once calibration will not work with these. To arm them, but not have the motors spin they need to see a PWM signal of less than 1.11 milliseconds (1110 in APM-speak). They output full throttle at a PWM signal of 1.89 milliseconds.
The way I adjusted my RC transmitter endpoints was to hook one of my APMs up to Mission Planner on my PC via USB and bring up one of the real time PWM displays, like the Failsafe screen or the radio calibration screen. That showed me what my current throttle value was. I just adjusted the endpoints in my Futaba transmitter until I was below 1110 at zero throttle and just above 1890 at full throttle. Figuring it out took a while, but doing it took a couple of minutes.
Despite this bit of having to bend to Castle's will, I do love these ESCs. They are small, very light, don't get hot and seem built extremely well. I've abandoned Afros for these as my build choice.
Hi Willian,
Sorry I can't help you. Could you please tell me what frame are you using?
Thanks
I am using the V2 PRO QUAD/X8 Frame with 25mm custom Carbon Fiber arms.
http://www.quadframe.us/
Here is a great frame design with lightweight, thin vertical arms for best airflow.
http://www.instructables.com/id/Aluminum-sport-X-copter-frame-desig...
Just a pity those arms will oscillate horizontally when you spin up high torque motors with big props. Especially if you run the ESC's at high clocks without Simonk.
Why don't you just add me we can talk about it and maybe I need to work on the presentation but I assure you will love it.
LOL I have exactly high torque motors without simonk!!
they don't.... there is a torque wire for that. The middle hole at the end of the arm.
Dude...you're turning 12" props on 3S going by the inventables post. You're not turning high torque motors yet. Have you some pics of your 1200mm setup, maybe? And this "torque wire", that nobody else on here is using?
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