BL4020 Outrunner Brushless Motors
Brushless motors with neodymium magnets and rotating case are manufactured using advanced technologies from finest materials. Hardened steel shaft supported by three ball bearings and overall robust but lightweight construction ensure very long lifetime. The unique design of the motors gives extremely high torque allowing to rotate large diameter and pitch propellers without need of a gearbox. The optional radial mount set includes: mounting flange, propeller adaptor, securing collar, and screws.

Specification
No. Of cells	5-7x Li-Poly
Max. efficiency	86%
Max. efficiency current	20- 40 A (>78%)
No load current / 10 V	2,1 A
Current capacity	41 A/60s Ą@
Dimensions	41x20 mm
Shaft diameter	6 mm
Weight	248g/8.75oz.
Recomended model weight	2000-4000 g
Recomended prop without gearbox	5s Li-Po APC 138 5s Li-Po APC 128

BL4020 KV=520 Sample data sheet
Model	Voltage	Propeller	RPM	Max Current	Max Trust
BL4020	21V	13X8(Thin)	10130	44A	4650g	Ą@
BL4020	17V	13X8(Thin)	800	28A	3345g	Ą@
BL4020	22V	12X8(Thin)	10500	41A	4314g	Ą@
BL4020	17V	14X7(Thin)	8600	43A	3607g

Ą@
	4500g./160oz.	5S 4000mAH	EMAX 80A	14X7(Thin)
	2600g./92oz.	6S 5000mAH	EMAX 100A	13X8(Thin) 14X7(Thin)
	3600g./127oz.	6S 4000mAH	EMAX 80A	13X8(Thin) 13X6(Thin)
	.54 -2stroke .75 - 4stroke