EMAX E3 1303

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 $26.01

• 306 g on 3S

  On EMAX’s 12 V bench the 8000KV pulled 306 g at full throttle on a GF3018 two-blade, drawing 18.8 A (225.6 W).

  Source: EMAX bench tables

• 6.6 g with leads

  EMAX weighs the motor at 6.6 g with its 80 mm, 24 AWG leads; the bell is anodised 7075 aluminium.

  Source: EMAX drawing and spec list, EMAX USA product page

• N52SH magnets, single-strand windings

  EMAX uses high-temperature N52SH arc magnets, which it says keep their strength under load, and single-strand windings to keep resistance and heat down.

  Source: EMAX USA product page

• NSK bearings, steel shaft

  A steel shaft runs in NSK precision bearings, which EMAX says cut noise and vibration at high rpm.

  Source: 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 10.7 A (5000KV on 4S), 18.8 A (8000KV on 3S) and 21.6 A (11000KV on 2S); its bench tests peaked at 21.62 A (11000KV, GF3016, 7.4 V). An ESC rated for at least 22 A per motor covers all three. (EMAX USA product page, EMAX bench tables)

Props

EMAX lists 2 to 3.5-inch props for the 5000KV and 2 to 3-inch for the 8000KV and 11000KV. On its bench the 8000KV pulled most on the GF3018 two-blade (306 g at 12 V), the 5000KV on the AVAN 2.5-inch three-blade (255 g at 16 V) and the 11000KV on the GF3016 (245 g at 7.4 V). (EMAX USA product page, EMAX bench tables)

Battery

2S–4S for the 5000KV, 2S–3S for the 8000KV and 1S–2S for the 11000KV. (EMAX USA product page, EMAX drawing and spec list)

Frame

Four M2 holes on a 9 mm circle; 5 mm and 6.5 mm M2 screws come in the box. (EMAX drawing and spec list)

Where to buy

• EMAX USAthe maker’s US store; same price for every KV (all three were listed as sold out)
  $16.89seen Oct 19, 2026
  Visit
• EMAXthe maker’s global store; 5000KV, 8000KV and 11000KV
  $26.01seen 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, 1.5 mm prop shaft standing 3.5 mm above the bell; 2 mm through the bearings. (EMAX drawing and spec list, EMAX USA product page)
• Bell. 7075 aluminium, anodised; one-piece outer rotor. (EMAX USA product page)
• Magnets. N52SH arc magnets. (EMAX USA product page)
• Stator. The coils are wound on a stack of thin steel laminations: 13 × 3 mm (1303). (EMAX USA product page, EMAX drawing and spec list)
• Winding. Single-strand. (EMAX USA product page)
• Bearings. NSK precision bearings (EMAX gives no size). (EMAX USA product page)
• Base. 4 × M2 holes on a 9 mm circle (9 × 9 mm). (EMAX drawing and spec list, EMAX product page)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 8000KV 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 13 × 3 mm stator, 17.3 mm bell, 10.6 mm height, 1.5 mm shaft, 9 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 1303 Brushless Motor (product page, with per-KV electrical specs and EMAX’s E3 infographics). Retrieved Oct 19, 2026.
2. EMAX: E3-1303 dimension drawing and spec list (image on EMAX USA’s product page). Retrieved Oct 19, 2026.
3. EMAX: E3 1303 5000KV 8000KV 11000KV brushless motor (product page on EMAX’s global store). Retrieved Oct 19, 2026.
4. EMAX: E3-1303 bench tables (image on EMAX’s global product page): 5000KV at 8.4, 12 and 16 V, 8000KV at 8 and 12 V, 11000KV at 4.2 and 7.4 V, one table per prop with current, thrust, power, efficiency and rpm at 40, 60 and 80% then “Max” (50 and 75% then “Max” for the 11000KV). The image cuts off the top of the 11000KV’s 4.2 V section.. Retrieved Oct 19, 2026.