Tests of 0603 vs 0802 at high frequency PWM. 0603 shows 60% flight time enhancement and this flight time is 17% more than the best of 0802.
Explanation of higher efficiency with PWM frequency, efficiency vs damping and theoretical limit of efficiency improvement.
JESC efficiency measured for 24kHz, 48kHz damped and undamped versions.
0603 and 0802 motors are compared. The reason of different flight time is a bug in BLHeli_S firmware that affects 0603 motors. The thrust and rpm curves are the same, the only difference is current consumption caused by excess braking.
Proof-of-concept ESC firmware mod makes flight 30% longer. Video tests.