Brushless engines

Brushless motors use a standard numbering scheme to describe their physical size and kV rating. For example: let’s assume we have a 5055-3000kV Brushless Outrunner Motor from Scorpion for example. We break the numbers out as follows:  [50] [55] – [3000]

  • [50] The first two numbers represent the diameter of the motor’s housing in millimeters; in this example 50mm
  • [55] The second two numbers represent the length of the motor housing in millimeters; in this example 55mm
  • [3000] The numbers after the dash represent the kV rating of the motor; in this example 3000kV.

Other brands like Kontronik use 800 / 1000 serie numbers like the Pyro 800-48

  • Pyro repesents the engine familie
  • [800] Represents the size
  • [48] Is the numbert of kV rating devided by 10. In this case 480kV

The kV rating (not to be confused with kilo-volt) is the RPM of the motor (k) per volt (V) with no load. For example, a brushless motor with a kV rating of 3000 powered by a 12V power source would be capable of 36,000 RPMs (multiply 3000×12). This is the max RPMs that this motor can reach under no load. A motor with a higher kV will have more top end speed, but not as much acceleration/torque. A motor with a lower kV will not be as fast, but will accelerate faster and have more torque.

Showing all components of scorpion engine.
  1. Machined aluminum front housing with multi angled cooling holes.
  2. Threaded prop adapter.
  3. Rear threaded mounting holes.
  4. An aluminum cross style mount.
  5. NdFeB magnets.
  6. Durable black Electro-Coat finish on the flux ring to look good for years to come.
  7. Sstator plates.
  8. Shielded ball bearings are used to support the motor shaft in all our motors.
  9. High Temperature 180 C (356 F) rated wire is used for winding the motors to minimize the risk of burning up the motor.
  10. High temperature adhesives are used to secure the stator windings and prevent them from shifting and getting pinched or shorting out .