EMAX RS2306

What you get

• About 2 kg on 4S

  At 16 V the 2750KV pulled 2,017 g on a 6040BN tri-blade at 64.7 A, and 1,762 g on a 5-inch GF5050; the 2400KV pulled 1,871 g and 1,552 g on the same props.

  Source: EMAX 2750KV bench tables, EMAX 2400KV bench tables

• Thin arc magnets

  1.8 mm N48SH arc magnets; EMAX says the lower rotating mass shortens spin-up and speeds acceleration.

  Source: EMAX product page, EMAX USA product page (2019 copy)

• NSK bearings, 0.15 mm laminations

  Japanese NSK bearings, and 0.15 mm silicon-steel laminations that EMAX says cut eddy-current loss.

  Source: EMAX product page

• Hollow steel shaft

  A hollow steel shaft with an M5 prop thread, given by EMAX USA as 4 mm and hardened and tempered.

  Source: EMAX product page, EMAX spec sheet, EMAX USA product page (2019 copy)

What to pair it with

Our reading of EMAX’s numbers, so your build matches what the motor was tested with.

ESC

EMAX gives no current rating. On its 16 V bench the 2400KV drew up to 46.4 A on 5-inch props (GF5050) and the 2750KV up to 57.2 A; on the 6040BN they reached 52.6 A and 64.7 A. A 50 A ESC covers the 2400KV on 5-inch props; the 2750KV needs 60 A. (EMAX 2400KV bench tables, EMAX 2750KV bench tables)

Props

EMAX lists 5-inch props, and its prop seat has an anti-slip design that works only with EMAX’s AVAN props. Of the 5-inch props it tested at 16 V, the GF5050 pulled most: 1,552 g on the 2400KV and 1,762 g on the 2750KV. (EMAX spec sheet, EMAX product page, EMAX 2400KV bench tables, EMAX 2750KV bench tables)

Battery

3S–4S. EMAX tested both KVs at 12 V and 16 V. (EMAX spec sheet, EMAX 2400KV bench tables, EMAX 2750KV bench tables)

Frame

Four M3 holes, 16 mm apart on one diagonal and 19 mm on the other. (EMAX spec sheet)

Where to buy

• EMAXthe maker’s global store; the 2400KV and 2750KV were listed at this price and sold out, the 2550KV at $12.32 and in stock
  $35.40seen Oct 19, 2026
  Visit

Plain links, not affiliate links. Prices change; the store’s page has the current one.

Full specs

Bench data

Redrawn from EMAX’s test reports. Thrust is static pull on a bench, more than you get in flight. Power is volts × amps; efficiency is thrust divided by power.

Inside the motor

A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:

• Stator. 0.15 mm silicon-steel laminations, wound 12N14P. (EMAX product page, EMAX spec sheet)
• Bell. A matte white bell with two-colour thermal printing, held on by a hex-head screw so it can be replaced. (EMAX product page, EMAX USA product page (2019 copy))

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 2400KV version reaches about these speeds; a prop loads the motor and brings it down, typically to around 70–75% of these figures at full throttle.

A 14-pole rotor has 7 pole pairs, so every turn of the shaft is 7 electrical cycles, and a six-step ESC switches the phases 42 times per turn.

About the 3D model

A generic outrunner drawn from EMAX’s published sizes: the 23 × 6 mm stator, 28.3 mm bell, 17.1 mm height, 5 mm shaft and 12 teeth and 14 magnets. Anything EMAX doesn’t publish is typical for a motor this size, and the bell’s spoked top, the base and the inside are a generic design, not this motor’s. The colours are read off the maker’s product photos. There are no logos or markings: it is our drawing, not the maker’s.

Sources

1. EMAX: EMAX RS2306 White Editions RaceSpec Motor 2750KV 2400KV 3-4S (product page on EMAX’s global store, with EMAX’s RS2306 infographics). Retrieved Oct 19, 2026.
2. EMAX: RS2306 specification (dimension drawing and spec list for the 2400KV and 2750KV; image on EMAX’s product page). Retrieved Oct 19, 2026.
3. EMAX: RS2306-2400KV bench tables at 12 V and 16 V, four props (image on EMAX’s product page). Steps of about 2 A (5 A on the 6040BN). EMAX does not label the last rows; its spec sheet gives the 16 V GF5050 table’s last row, 1552 g, as the motor’s max thrust, so only that row is marked as the maximum. EMAX’s power column is the test voltage times the current.. Retrieved Oct 19, 2026.
4. EMAX: RS2306-2750KV bench tables at 12 V and 16 V, four props (image on EMAX’s product page). Steps of about 2 A (5 A on the 6040BN). EMAX does not label the last rows; its spec sheet gives the 16 V GF5050 table’s last row, 1762 g, as the motor’s max thrust, so only that row is marked as the maximum. EMAX’s power column is the test voltage times the current.. Retrieved Oct 19, 2026.
5. EMAX USA: EMAX RS2306 Racing Series Brushless Motor (white) (EMAX USA’s old product page on emax-usa.com, Wayback Machine copy of 2019-12-06). Retrieved Oct 19, 2026.