Click here for a dimension chart	B20 L Series B20 12L w/4:1 B20 15L w/4:1 B20 18L w/4:1 Kv (rpm/V) 4630 3700 3086 Max Power (W) 275W 220W 200W Max Amp (15sec) 25A 20A 18A Max Efficiency 87% 87% 87% Io (No load A) 1.11A 0.83A 0.66A Rm (Resistance) 0.037Ohm 0.057Ohm 0.085Ohm Shaft Diameter 3mm 3mm 3mm Gearbox 4:1 4:1 4:1 Motor Diameter 20mm 20mm 20mm Motor Length 55.9mm 55.9mm 55.9mm Motor Weight 69g 69g 69g Built in Fan N/A N/A N/A Max Rpm 60,000 60,000 60,000 Poles 2 2 2 Case Smooth Smooth Smooth ESC Timing 0-5 deg 0-5 deg 0-5 deg ESC Switching Freq. 8KHz 8KHz 8KHz
Model type Model name Motor Controller Cells Prop Sailplane LMR Sky Sergio B20 12L 4:1 Hacker X-20 EM1800 2S Li-poly 12x7 Folding Sailplane LMR Pulsar 2008 B20 15L 4:1 Hacker X-30 EM2200 3S Li-poly 12x7 Folding Aerobatic Parkflyer Jumping Jack B20 15L 4:1 Hacker X-30 EM1800 3S Li-poly 10x7 APC-S Mini Pattern Quiet Storm B20 18L 4:1 Hacker X-20 EM1800 3S Li-poly 12x6 APC-S Sport flyer Pretty B20 18L 4:1 Hacker X-20 EM1800 3S Li-poly 10x7 APC-S Parkflyer Fundango B20 18L 4:1 Hacker X-20 EM1800 3S Li-poly 12x4.7 APC-S Parkflyer Kadet EP-42 B20 18L 4:1 Hacker X-20 EM2200 3S Li-poly 10x7 APC-S