Hi guys, I've been grounded for a while (due to a motor that I was too lazy to fix) but I'm back now, and I have questions.
I'd like to eventually make my current hexa-copter, into a coaxial 12 rotor machine; a dodeca-copter. I was wondering if anyone else had done this, and how it's done.
My current frame is a Tarot FY690s, modified with longer arms to be 800mm from the hub of one motor to the one directly across from it.
Currently mounted on each of it's 6 motor mounts is one of these (http://www.ebay.com/itm/Mystery-5010-750KV-Quadcopter-brushles-motor-for-multi-axis-aircraft-/271517507633)
Not necessarily that brand but 5010-750kv motor of that design.Each motor swings a 13"-5.5 prop
Each motor is controlled by a Hobbywing Platinum Pro 30 Amp opto ESC.
This is all controlled by a "Arducopter" flight controller Running 2.5 firmware (I think, it's whatever the latest 2.x firmware is, updated it yesterday 9/6/18)
My question is basically- is it possible to use a 'Y'-splitter on each servo channel to the motors and control 2 ESCs and their respective motors per channel?
Basically signals from each of the 6 output channels would go to 2 ESCs and motors on the same arm counter-rotating one another.
Is it really that simple or will there be other limitations, such as the Flight controller being unable to control 12 motors. Will each motor pair be able to share a contacts on the power distribution board or will I need a Power distribution board that can give 12 separate motors, 12 separate spots to draw power from?
Are there any Flight controllers that /can handle 12 motors without modification?
How do Coax-copter control their Yaw? If you slow the counter-rotating motor on one side and speed up the ones directly opposite of them, won't that just cause a roll as opposed to a yaw? Since the motors are counter-acted by one another?
It seems to me that each channel would need to control the upper motor on one side and the lower motor on the side directly opposite, to achieve yaw, but that would cause other problems, such as unwanted yaw when trying to control pitch, I think.
To overcome this, would i need to run it as an Octo-copter and have outputs 7 and 8 control pitch and yaw, or upgrade to another Flight controller?
After some further research it appears that simply setting up the Flight controller to fly a coaxial 6 rotor would solved all the previous yaw and pitch issues I was mulling over, it'd simply be a Y-6 only doubled and inverted in every way.