EMAX ECO II 3220

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

• 7.3 kg at 48 V

  At 47.32 V the 500KV pulled 7,323 g at full throttle on an HQ1050 three-blade, drawing 74.39 A (3,520.1 W).

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

• Three bearings

  EMAX carries the shaft on three precision bearings, with a 6 mm bearing shaft and an M5 prop thread.

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

• 5.7 g/W at 30% throttle

  On an HQ1145 at 32 V the 700KV made 716 g at 30% throttle, at 5.72 g/W.

  Source: EMAX spec sheet and bench tables

• One housing, three windings

  500KV for 12S and 700KV and 1000KV for 6S–8S, all in the same 171 g, φ39.1 × 55.8 mm 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’s peak currents are 74.4 A (500KV at 48 V), 82.8 A (700KV at 32 V) and 127.4 A (1000KV at 32 V on an 8-inch two-blade); at 24 V the 1000KV drew up to 117.76 A. The 500KV needs a 12S ESC rated for about 80 A, the 700KV about 90 A, and the 1000KV 130 A. (EMAX USA product page, EMAX spec sheet and bench tables)

Props

10 to 11-inch for the 500KV and 700KV, 8 to 10-inch for the 1000KV. EMAX tested the first two on 10 and 11-inch three-blades and the 1000KV on 9 and 10-inch three-blades and an 8-inch two-blade. (EMAX spec sheet and bench tables)

Battery

12S for the 500KV, 6S–8S for the 700KV and 1000KV; EMAX ran its tests at 48 V, 32 V and 24 V. (EMAX spec sheet and bench tables, EMAX USA product page)

Frame

Four M3 holes, 19 × 19 mm; four M3×10 screws and an M5 nylock nut come in the box. (EMAX spec sheet and bench tables, EMAX USA product page)

Where to buy

• EMAX USAthe maker’s US store; same price for every KV (all listed as sold out)
  $68.99seen Oct 19, 2026
  Visit
• EMAXthe maker’s global store; all three KVs (all listed as sold out)
  $92.38seen 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 thread (CW), stands 18 mm above the bell; 6 mm through the bearings. (EMAX spec sheet and bench tables, EMAX USA product page)
• Bell. Anodised. (EMAX spec sheet and bench tables, EMAX USA product page)
• Stator. The coils are wound on a stack of thin steel laminations: 32 × 20 mm (3220). (EMAX USA product page, EMAX spec sheet and bench tables)
• Winding. Multi-strand. (EMAX spec sheet and bench tables, EMAX USA product page)
• Bearings. Three precision bearings (EMAX gives no size). (EMAX spec sheet and bench tables, EMAX USA product page)
• Base. 4 × M3 holes, 19 × 19 mm. (EMAX spec sheet and bench tables, EMAX USA product page)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 700KV 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 32 × 20 mm stator, 39.1 mm bell, 37.8 mm height, 5 mm shaft, 19 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: EMAX ECO II 3220 Brushless Motor (product page, with the mechanical and electrical tables and each prop’s full-throttle bench row). Retrieved Oct 19, 2026.
2. EMAX: ECOII 3220 500KV/700KV/1000KV (product page on EMAX’s global store). Retrieved Oct 19, 2026.
3. EMAX: ECOII-3220 spec sheet and bench tables (one image on EMAX’s global product page): drawing, spec table for each KV, feature list, and tables by throttle, 30% to 100%, for the 500KV at 48 V, the 700KV at 32 V and the 1000KV at 24 V (four props) and 32 V (one), with the measured voltage on each row. The 700KV tables appear twice and are entered once; the 1000KV tables’ rpm column is left out (see the notes).. Retrieved Oct 19, 2026.