Yes it is true that 20x20 flight control / esc stack can drive 6s 1750 motor without any problem!!
TBS Oblivion Frame Set
EMAX Mini Magnum 2 F4
BrotherHobby Returner R6 2207 1750kV
HQ Prop DP 5x4.5x3 V1S
AirbladeUAV has done it again and this time they've brought long range to the 5" class! Based on the popular Transformer Mini, the new Transformer 5" Ultralight adopts a lot of the same design philosophies with larger props and more payload capacity. It can fly upwards of 20 minutes on a 4 cell Li-Ion battery pack and in ideal conditions it's got a range of over 4 to 5 miles. In this guide I'll walk..
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i can use the returner r6 2150 with 4s batteris on the same build ?
yes I think so. But usually 5s battery is used for 2150kv motor.