I want to build a quadcopter racing drone, looking for flight controller. I found a topic "Looking for FC recommendation" on here https://droneracingpilots.com/threads/looking-for-fc-recommendation.814/ . But for racing do not need GPS future. I also found that RMRC Seriously Dodo Flight Controller Rev 3b, KISS FC and Crazepony F3 Flight Controller are good for FPV racing quad recommended by here Quadcopter Flight Controller Board Comparison , RMRC FC Its voltage of 2-6s for input and 5v for output makes it quite reliable. KISS FC It’s a 32bit flight controller with an F3 processor which means that performance is top-notch. Buy which one is good for FPV 180 OR 250 racing?