EMAX E3 1407

What it pulls

EMAX’s own bench test, one line per prop. Drag across the chart to move the throttle; the model above follows.

What you get for $30.78

• 691 g on 4S

  On EMAX’s 16 V bench the 3300KV pulled 691 g at full throttle on an HQ 4 × 3 three-blade, drawing 22.52 A (360.3 W).

  Source: EMAX spec sheet and bench tables

• 4.42 g/W at 121 g

  At 40% throttle on 16 V the 2800KV made 121 g on an HQ 4 × 4.3 three-blade at 4.42 g/W, drawing 1.71 A.

  Source: EMAX spec sheet and bench tables

• M5 shaft on a micro motor

  A steel shaft with an M5 thread, standing 12 mm above the bell, takes nut-on props; EMAX includes an aluminium M5 nylock nut.

  Source: EMAX spec sheet and bench tables, EMAX USA product page

• N52SH magnets, single-strand windings

  EMAX uses N52SH arc magnets, single-strand windings and NSK bearings in an anodised 7075 aluminium housing.

  Source: EMAX spec sheet and bench tables, 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 on 4S at 16.5 A (2800KV), 22.5 A (3300KV) and 25.8 A (4100KV); the most its bench tests drew was 25.81 A (4100KV on a GF3052 at 16 V). A 30 A ESC covers all three. (EMAX spec sheet and bench tables)

Props

EMAX lists 3 to 4-inch props. On its 16 V bench the 3300KV pulled most on an HQ 4 × 3 (691 g) and the GF4023 (668 g); the 2800KV and 3300KV were also tested on 85 mm ducted props, and the 2800KV on a 76 mm eight-blade duct. (EMAX spec sheet and bench tables)

Battery

4S for the 2800KV; 3S–4S for the 3300KV and 4100KV. EMAX gives every KV’s peak figures on 4S. (EMAX spec sheet and bench tables)

Frame

Four M2 holes on a 12 mm circle (12 × 12 mm); M2 screws in 5 and 6 mm lengths come in the box. (EMAX spec sheet and bench tables)

Where to buy

• EMAX USAthe maker’s US store; same price for every KV (all three were listed as sold out)
  $19.99seen Oct 19, 2026
  Visit
• EMAXthe maker’s global store; 2800KV, 3300KV and 4100KV
  $30.78seen 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:

• Shaft. Steel, M5 prop thread (CW) standing 12 mm above the bell; 2 mm through the bearings. (EMAX spec sheet and bench tables, EMAX USA product page)
• Bell. 7075 aluminium, anodised; one-piece outer rotor. (EMAX spec sheet and bench tables, EMAX USA product page)
• Magnets. N52SH arc magnets. (EMAX spec sheet and bench tables)
• Stator. The coils are wound on a stack of thin steel laminations: 14 × 7 mm (1407). (EMAX USA product page, EMAX spec sheet and bench tables)
• Winding. Single-strand. (EMAX spec sheet and bench tables)
• Bearings. NSK precision bearings (EMAX gives no size). (EMAX spec sheet and bench tables)
• Base. 4 × M2 holes on a 12 mm circle (12 × 12 mm). (EMAX spec sheet and bench tables)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 3300KV 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 12-pole rotor has 6 pole pairs, so every turn of the shaft is 6 electrical cycles, and a six-step ESC switches the phases 36 times per turn.

About the 3D model

A generic outrunner drawn from EMAX’s published sizes: the 14 × 7 mm stator, 19.1 mm bell, 16.4 mm height, 5 mm shaft, 12 mm mounting circle and 9 teeth and 12 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: EMAX E3 1407 Brushless Motor (product page, with its spec and per-KV electrical tables and EMAX’s E3 infographics). Retrieved Oct 19, 2026.
2. EMAX: E3 1407 2800KV 3300KV 4100KV brushless motor (product page on EMAX’s global store). Retrieved Oct 19, 2026.
3. EMAX: E3-1407 motor specifications V1.0 (image on EMAX’s global product page): dimension drawing, spec table for each KV, feature list and bench tables (2800KV at 16 V; 3300KV at 16 V and, on a ducted prop, 12 V; 4100KV at 16 and 12 V), one table per prop with current, thrust, power, efficiency and rpm at 40, 60 and 80% then “Max”. Retrieved Oct 19, 2026.