The RPM sensor is an accessory of the high voltage speed controller. F..
Type: 4800KV-2040SLKV: 4800Motor Diameter (excluding water cooling): 20mmLe..
Type: 3900KV-2848SLKV: 3900Max current: 41AVoltage input: 2-3S LipoMax Powe..
Type: 3660SLKV: 3180Motor Diameter (excluding water cooling): 35.8mmWater c..
Tube 2040:Used for motor which outer diameter is 20mmThe water cooling jack..
Tube 2848:The water cooling jacket outer diameter:32.5mmLength:26mm..
Tube 3660:The water cooling jacket outer diameter:42.3mmLength:45mm..