BX1306 Brushless Motor Outrunner 4000KV


The BX 1306 Brushless Motor:

“ItGresa, we need a really small motor for our Fairyweight spinning weapons. Can you help us?” Sure! We’re up for the challenge! This BX 1306 Brushless Motor is small but mighty. Four equally spaced mounting holes allow it to be mounted effectively to any weapon mount. There are no mounting holes on the top of the motor, so you fairyweight builders will need to use the M5 threaded shaft on the motor to attach your weapon. The 1306 Brushless Motor is lightweight and comes in three different speeds: 2300kv, 3100kv, and 4000kv. They’re tiny, but powerful.

ItGresa is expanding our line of Fairyweight products to better serve the combat robotics market. Check it out!


17 in stock (can be backordered)

SKU: bx1306-4000kv Categories: , , ,

Product Documents

Drawings - CAD


Specifications: Values:
KV: 4000rpm/V
Input Voltage: 7.4V-11.1V (2S-3S)
Max Watts: 158W
Current: 9.39A
Suggested ESC: 7A-12A
Weight: 12g (0.42oz)
Motor Diameter: 18mm (0.70in)
Motor Length: 15.1mm, motor only
Wire Length: 105mm (4.13in)
Wire connection: Stranded wire only, no connectors for a soldered connection.
Shaft Diameter: 2.0mm (0.08in) threaded with M5 threads/td>
Shaft Length: 14mm (0.55in)
BX 1306 Mounting Holes:
  • Four M2 spaced 9mm (0.35in) 90degrees offset.
BX 1306 Wiring:
  • Connect the three ESC wires any way you like. If the motor is spinning backward, you can reverse the direction of any brushless motor by swapping any two wires.
Brushed vs Brushless

In case you’re wondering why brushed vs brushless, here’s a great article that explains the difference and when to use each: https://www.arrow.com/en/research-and-events/articles/powering-a-battlebot

Here’s another: https://battlebots.fandom.com/wiki/Brushless_vs._Brushed_Motors

Brushless motors are almost universally used for weapons motors, for the reasons listed in the article. Brushless motors are now becoming more popular as drive motors for combat bots as well, with brushless varieties for antweight and beetleweight bots now available.

Brushless Motor Confusion

But wait! These articles talk about how brushless motors are more efficient than brushed motors! Why do brushed motors dominate smaller bot classes as drive motors?

Some simple reasons:

  1. Brushed motors are generally much cheaper.
  2. They have more power and torque at low speeds.
  3. Controllers only require two wire connections: simpler, less expensive controllers.
  4. All of the above means a lower cost and weight penalty.
  5. Most importantly, adequate drives with the right gearing and price point are generally much less available in form factors suitable for drive motors in smaller bots. But this is changing. Fingertech and Repeat Robotics have now come out with brushless drive motors for beetleweights, and Repeat now has a model for antweights.
Brushless drive motors for ants and beetles
Manufacturer: Class: Name: Link:
Fingertech Mega Spark 2300kv Beetleweight Link
Fingertech Mega Spark 1500kv Beetleweight Link
Repeat Robotics Repeat Drive Max Beetleweight Link
Repeat Robotics Repeat Drive Max Antweight Link
Fingertech BL-Heli 20A ESC (Reversing) Brushless ESC Link
Repeat Robotics Repeat Reversing ESC Brushless ESC Link
Brushed Drive Motors for Antweights:

If you’re looking for brushed motors, most builders use Silver Sparks or Repeat Robotics Brushed for antweight drive motors.