Below it´s shown my last build based in M4 + Joerg (aBUGSworstnightmare) BLDC expansion board. I used all basic material of-the-store (Flyduino/Viacopter):
Warthox frame (25cm arms): (http://flyduino.net/Quadrocopter-Frame-Set-25cm-arm) 35€
X-Motors 2208 (http://flyduino.net/Multikopter-Brushle ... icopter_17) 19.90€
Propellers HQ-9x4.5 (http://flyduino.net/HQProp-9x45-Carbon- ... -2CW-2-CCW) 8.90€
KISS 18A (http://flyduino.net/KISS-ESC-2-4S-18A-v11_1) 18.90€
M4 (https://www.viacopter.eu/multirotor-sho ... pter-store) 125€
Joerg BDSL expansion board (TBD price): THANKS Joerg!! Very nice board!!
For 325€ about any can get inside AQ with an incredible performance. This machine flies very well, ultra smooth and still with a lot of power to keep a GoPRO or FPV system.
With a 3S 2200 I get 15min flight. For the moment using PID, but I´ll test QUATOS next. 500gr w/o battery
Parameters and fw attached. Adaptor plate for M4 (made in ABS, 3D Printed) stl file attached.
Enjoy