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Specification (No. Of cells 3-4x Li-Poly) (RPM/V 919) (Max. efficiency current 38-59A (75%) (No load current / 10 V 2,1 A) (Current capacity 59A/60s) (Dimensions 30x20 mm) (Shaft diameter 5 mm) (Weight 144g/5.07oz) (Recomended model weight 600-1600g) (Recomended prop without gearbox 11x7"-11x5.5") (Model BL2820), (Voltage 12V), (Propeller 11X7(Thin), (RPM 8680), (Max Current 38A), (Max Trust 1450g)/ (Model BL2820), (Voltage 14V), (Propeller 12X6(Thin), (RPM 9580), (Max Current 53A), (Max Trust 1870g) SAMPLE DATA/ TRAINER (model weight 2300g./81oz). (LiPo 4S 3500mAH) (ESC 60A) Prop 12X6(thin). 3D PLANE (model weight 1500g./53oz). (LiPo 4S 3500mAH) (ESC 60A) Prop 12X8(Thin) AREOBATIC (model weight 2200g./77oz). (LiPo 4S 3500mAH) (ESC 60A) Prop 12X6(thin)