T-Motor F90 2806.5 1300Kv/1500Kv Motor

F60x, F80 now F90 with range of KVs. Build No 5 of 5 with varying ESC , Batt and motors. Away from drone design purpose and using preferred Spektrum smart ESC with telem and in this case a dual 40A ESC chosen for twin MOT model with differential thrust and reverse thrust. A very fussy ESC wrt current draw and voltage drop. So battery and pop selection critical. F90 specified for 5S/6S, but seeking 3S or 4S application with 6' or 7' tri or bi blades - cannot go to 8' or 9' blades due geometry of fuselage and MOT nacelles, pull position. 3S works fine, smooth and responsive but thrust to weight about 1.1 and power draw less than 1/2 pwr system capacity. 5S rip raws but 2/3 pwr has occasional brushless burp and ESC shutdown on 2 test runs. Thrust/weight about 2:1. 4S runs sweet as 3S and peaks at T/W about 1.5:1. Happy with this.