A capacitor across the battery leads is one of the cheapest, highest-impact additions to any FPV build. It suppresses voltage spikes, cleans video feed noise, and protects ESC MOSFETs from back-EMF transients. Why Voltage Spikes Happen When a motor changes speed rapidly, it generates back-EMF — a voltage spike that …

A collection of "first 10 minutes of a new build" failures and how to diagnose them. Wrong Motor Direction (Single Motor) Symptom: Quad lifts but drifts or rotates on the yaw axis; one arm tilts down immediately on throttle. Cause: One motor spinning the wrong direction. Motors come as CW and CCW variants; some have …

A handful of ESC-side settings decide how reliably a motor spins up and how it behaves when abused. The headline failure they guard against is desync — the mid-air motor cutout that ends in a crash. This covers demag compensation, startup/rampup power, and the protection group in BLHeli_32 and AM32. For the timing …

DSHOT is the digital FC-to-ESC protocol. Every PID loop the flight controller sends a fixed-length frame carrying a throttle value plus a checksum; in bidirectional mode the ESC answers on the same wire with its electrical RPM. This is the byte-level view — what actually travels down the signal wire. For the tuning …

ESC PWM frequency controls how often the ESC updates the power delivered to the motor. Higher frequency = smoother power delivery, lower frequency = less heat but coarser control. What PWM Frequency Does The ESC uses PWM to modulate the voltage applied to each motor phase. The frequency determines how many times per …

Motor timing advance shifts the ESC's commutation point forward in the electrical cycle relative to the motor's rotor position. Higher advance = more power at the cost of efficiency and heat. What Timing Advance Does A brushless motor's ESC switches phase power based on rotor position. "On time" — switching exactly …