S2838 Brushless Inrunner 2970KV



This S2838 Brushless Inrunner 2970KV is used as a weapon motor for heavier robots, such as the Beetleweight class. We use them in our Beetleweight bots to drive the Beater Bar weapons. One of our Beetles took first place at Battle in the Backwoods, so we can vouch for their success and durability. They have not failed us yet.

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 used as drive motors for the very large combat bots as well.

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 and 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.

The S2838 Brushless Inrunner 2970KV motor is perfect for weapon motors.


20 in stock (can be backordered)

SKU: ft-S2838-2970KV Categories: , , , Tag:

Product Documents

Drawings - CAD


Specifications: Values:
KV: 2970rpm/V
Max Voltage: 14.8v 2s~4s
Max Watts: 300w
Max Load: 22A
Max Resistance: 0.0500Ω
Weight: 98.71g (3.48oz)
Motor Diameter: 28mm (1.10in)
Motor Length: 38mm (1.49in). 50mm (2.16in) to end of heatshrink.
Wire Length: 56mm (2.2in) (measured from end of heatshrink to end of bullet connector)
Plug Type: 3mm Bullet-connectors (includes mating connectors for soldering on ESC)
Shaft Diameter: 3.17mm (0.125in)/td>
Shaft Length: 12.7mm (0.5in)
Can size: 380
Mounting Holes:
  • Two M2.5 spaced 16mm (0.63in), two M3.0 spaced 19mm (0.75in)
  • Do not use screws that protrude more than 4.7mm (0.18in) into the mounting face.
S2838 Brushless Inrunner 2970KV Wiring:
  • Connect the three ESC wires any way you like. If the motor is spinning backwards, you can reverse the direction of any brushless motor by swapping any two wires.
Motor Page:
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