EMAX RSIII 2207

What you get for $30.78

• 2.2 kg of pull on 6S

  On EMAX’s 25.2 V bench the 2100KV pulled 2,220 g at full throttle on an HQ 5 × 4.8 × 3, drawing 47.9 A.

  Source: EMAX 2100KV payload test

• Titanium alloy shaft

  A 4 mm titanium alloy shaft with an M5 prop thread; EMAX USA says titanium is stronger and lighter than steel.

  Source: EMAX USA product page, EMAX product page, EMAX spec sheet

• Rated for 150 °C

  EMAX pairs N54SH magnets with single-strand wire rated for 240 °C, and rates the motor for 150 °C, with 180 °C as its maximum.

  Source: EMAX USA product page

• 29.4 g

  EMAX lists 29.3–29.4 g without leads, depending on the KV, on a 7075 aluminium bell.

  Source: EMAX spec sheet, EMAX USA product page

What to pair it with

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

ESC

EMAX rates the peak current at 43 A (1800KV) and 50 A (2100KV) on 6S, and 45 A (2500KV) on 4S. Its own bench tests topped out at 50.3 A (2100KV, DALPROP Cyclone 5046). An ESC rated for 50 A or more covers the 2100KV; 45 A covers the 1800KV and 2500KV. (EMAX spec sheet, EMAX 1800KV payload test, EMAX 2100KV payload test, EMAX 2500KV payload test)

Props

EMAX lists 5 to 5.5-inch props (5-inch for the 2100KV). On its 6S bench the 2100KV pulled 1,980–2,220 g at full throttle on five props; the 1800KV pulled most on the DALPROP Cyclone 5050 (1,930 g). (EMAX spec sheet, EMAX 1800KV payload test, EMAX 2100KV payload test)

Battery

6S for the 1800KV and 2100KV, 4S for the 2500KV. EMAX rates the first two for 3S–6S and the 2500KV for 3S–4S, and tested them at 25.2 V and 16.8 V. (EMAX spec sheet, EMAX 1800KV payload test, EMAX 2100KV payload test, EMAX 2500KV payload test)

Frame

Four M3 holes on a 16 mm circle (16 × 16 mm). (EMAX spec sheet)

Where to buy

• EMAX USAthe maker’s US store; one page for the 2207 and 2306, same price for every KV (the 2207 2100KV was listed as sold out)
  $19.99seen Oct 19, 2026
  Visit
• EMAXthe maker’s global store
  $30.78seen Oct 19, 2026
  Visit
• GetFPVchoose the KV
  price on the store’s page
  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:

• Shaft. Titanium alloy, M5 thread, protrudes 12.9 mm; 4 mm through the bearings. (EMAX spec sheet, EMAX USA product page, EMAX product page)
• Bell. 7075 aluminium. (EMAX USA product page)
• Magnets. N54SH neodymium magnets. (EMAX USA product page)
• Stator. The coils are wound on a stack of thin steel laminations: 22 × 7 mm (2207). (EMAX spec sheet)
• Winding. Single-strand, AIW enamelled copper wire rated for 240 °C. (EMAX USA product page)
• Bearings. G1-grade high-speed bearings (EMAX gives no size). (EMAX USA product page)
• Base. 4 × M3 holes on a 16 mm circle (16 × 16 mm). (EMAX spec sheet)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 2100KV 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 22 × 7 mm stator, 26.9 mm bell, 20.1 mm height, 5 mm shaft, 16 mm mounting circle 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 USA: RSIII Brushless FPV Racing Motor (product page for the 2207 and 2306, with its materials list). Retrieved Oct 19, 2026.
2. EMAX: RSIII 2207 FPV Racing motor, 1800KV 2100KV 2500KV (product page on EMAX’s global store, with EMAX’s RSIII infographics). Retrieved Oct 19, 2026.
3. EMAX: RSIII-2207 spec sheet (dimension drawing and spec table for each KV; image on EMAX’s product page). Retrieved Oct 19, 2026.
4. EMAX: RSIII2207 1800KV payload test at 25.2 V, six props (image on EMAX’s product page). Steps of 300, 500 and 700 g, then “Max” at full throttle; EMAX’s rpm column is left out because it has no figure at full throttle.. Retrieved Oct 19, 2026.
5. EMAX: RSIII2207 2100KV payload test at 25.2 V, five props (image on EMAX’s product page). Steps of 300, 500 and 700 g, then “Max” at full throttle; EMAX’s rpm column is left out because it has no figure at full throttle.. Retrieved Oct 19, 2026.
6. EMAX: RSIII2207 2500KV payload test at 16.8 V, five props (image on EMAX’s product page). Steps of 300, 500 and 700 g, then “Max” at full throttle; EMAX’s rpm column is left out because it has no figure at full throttle.. Retrieved Oct 19, 2026.