FPV quadcopters racing and chasing - high speed!

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Two 250 quads close distance chasing at high speed.
Setup:
Cleanflight 1.9
ZMR250 - 4mm arms
Flip32
BL20A
Cobra 2204 2300
Gemfan 5045 Bullnose
Gens ace TATTU 1800mAh/1300mAh 75C 4S
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