AMAXinno Competition 2004

What it pulls

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

What you get for $23.00

• 1,063 g on 6S (2600KV)

  On AMAX's 6S bench the 2600KV pulled 1,063 g at full throttle on a 3.5 × 2 prop, drawing 21 A.

  Source: AMAX 6S table (2600KV)

• 20 g

  20 g with its 150 mm leads, 18 g without.

  Source: AMAX specs

• Eight KVs, one price

  Sold in 1650, 1850, 2050, 2200, 2400, 2600, 2850 and 3100KV, with bench tables for all but the 2050KV.

  Source: AMAX product page, AMAX 2S tables, AMAX 3S tables, AMAX 4S tables (3100KV, 2850KV), AMAX 4S tables (2200KV, 1650KV), AMAX 6S table (3100KV), AMAX 6S table (2600KV), AMAX 6S table (2200KV), AMAX 6S table (1850KV)

• One-piece Lock-Bell

  AMAX's Competition motors use a one-piece 7075 aluminium bell with no parting line, a hidden top bearing sealed to IP54 and a half-hollow titanium shaft.

  Source: AMAX Competition highlights

What to pair it with

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

ESC

AMAX's bench tops out at 21 A for the 2600KV (6S, 3.5 × 2 prop) and at 28 A across all its tables (2400KV, 3S, 7 × 4). A 30 A ESC covers them. (AMAX 6S table (2600KV), AMAX 3S tables)

Props

AMAX tested 3 to 7-inch props: 3 × 2 and 3.5 × 2 on 6S, 4 × 2.5 and 5 × 2 on 4S and 6S, and 6 × 3 and 7 × 4 on 2S to 4S. (AMAX 2S tables, AMAX 3S tables, AMAX 4S tables (3100KV, 2850KV), AMAX 4S tables (2200KV, 1650KV), AMAX 6S table (3100KV), AMAX 6S table (2600KV), AMAX 6S table (2200KV), AMAX 6S table (1850KV))

Battery

AMAX's tables run the 1850KV, 2200KV, 2600KV and 3100KV on 6S; the 1650KV, 2200KV, 2850KV and 3100KV on 4S; the 2400KV and 3100KV on 3S; and the 2850KV and 3100KV on 2S. (AMAX 2S tables, AMAX 3S tables, AMAX 4S tables (3100KV, 2850KV), AMAX 4S tables (2200KV, 1650KV), AMAX 6S table (3100KV), AMAX 6S table (2600KV), AMAX 6S table (2200KV), AMAX 6S table (1850KV))

Frame

Four M2 holes on a 12 mm circle (12 × 12 mm). (AMAX drawing)

Where to buy

• AMAXshopthe maker's store; single motor, any KV
  $23.00seen 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 AMAXinno’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:

• Bell. One-piece 7075 aluminium Lock-Bell, dynamically balanced, with an electroplated surface. (AMAX Competition highlights)
• Base. Extra-thick 7075 aluminium base with longer thread holes and cooling fins. (AMAX Competition highlights)
• Stator. Thin laminations made by Kawasaki in Japan. (AMAX Competition highlights)
• Shaft. Half-hollow titanium, fixed with a screw; the prop seat has anti-slip spikes. (AMAX Competition highlights)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 2600KV 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 AMAXinno’s published sizes: the 20 × 4 mm stator, 25.6 mm bell, 13 mm height, 5 mm shaft, 12 mm mounting circle and 12 teeth and 14 magnets. Anything AMAXinno 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. AMAX: Brushless Motor 2004 Competition (product page on AMAXshop, AMAXinno's own store: KV options, price, photos; the spec, drawing and bench images below are on it). Retrieved Oct 19, 2026.
2. AMAX: 2004 Competition specifications (image on the product page). Retrieved Oct 19, 2026.
3. AMAX: 2004 Competition spec icons, giving the 470 W peak power for under 10 s and the 350 W continuous power for over 10 s (image on the product page). Retrieved Oct 19, 2026.
4. AMAX: 2004 Competition dimension drawing in mm (image on the product page). Retrieved Oct 19, 2026.
5. AMAX: 2004 Competition bench tables, 2S: 3100KV on a 6 × 3 prop and 2850KV on a 7 × 4 (image on the product page): 30% to 100% throttle with current, thrust, power and efficiency. AMAX's temperature column is one figure per table (after 10 s at full throttle), so it is left out. Retrieved Oct 19, 2026.
6. AMAX: 2004 Competition bench tables, 3S: 3100KV on a 6 × 3 prop and 2400KV on a 7 × 4 (image on the product page): 30% to 100% throttle with current, thrust, power and efficiency. AMAX's temperature column is one figure per table (after 10 s at full throttle), so it is left out. Retrieved Oct 19, 2026.
7. AMAX: 2004 Competition bench tables, 4S: 3100KV on a 4 × 2.5 prop and 2850KV on a 5 × 2 (image on the product page): 30% to 100% throttle with current, thrust, power and efficiency. AMAX's temperature column is one figure per table (after 10 s at full throttle), so it is left out. Retrieved Oct 19, 2026.
8. AMAX: 2004 Competition bench tables, 4S: 2200KV on a 6 × 3 prop and 1650KV on a 7 × 4 (image on the product page): 30% to 100% throttle with current, thrust, power and efficiency. AMAX's temperature column is one figure per table (after 10 s at full throttle), so it is left out. Retrieved Oct 19, 2026.
9. AMAX: 2004 Competition bench tables, 6S: 3100KV on a 3 × 2 prop (image on the product page): 30% to 100% throttle with current, thrust, power and efficiency. AMAX's temperature column is one figure per table (after 10 s at full throttle), so it is left out. Retrieved Oct 19, 2026.
10. AMAX: 2004 Competition bench tables, 6S: 2600KV on a 3.5 × 2 prop (image on the product page): 30% to 100% throttle with current, thrust, power and efficiency. AMAX's temperature column is one figure per table (after 10 s at full throttle), so it is left out. Retrieved Oct 19, 2026.
11. AMAX: 2004 Competition bench tables, 6S: 2200KV on a 4 × 2.5 prop (image on the product page): 30% to 100% throttle with current, thrust, power and efficiency. AMAX's temperature column is one figure per table (after 10 s at full throttle), so it is left out. Retrieved Oct 19, 2026.
12. AMAX: 2004 Competition bench tables, 6S: 1850KV on a 5 × 2 prop (image on the product page): 30% to 100% throttle with current, thrust, power and efficiency. AMAX's temperature column is one figure per table (after 10 s at full throttle), so it is left out. Retrieved Oct 19, 2026.
13. AMAX: Highlights of Competition Motors (page linked from the product page; covers the whole Competition range: bell, base, magnets, stator, windings, bearings, shaft). Retrieved Oct 19, 2026.
14. AMAX: 2004 Competition main product photo (first image on the product page), used for finish. Retrieved Oct 19, 2026.
15. AMAX: 2004 Competition photo of the base (second image on the product page), used for the base colour. Retrieved Oct 19, 2026.
16. AMAXinno: home page as archived by the Wayback Machine on 2021-10-28, whose SHOP links go to amaxshop.com (amaxinno.com no longer resolves). Retrieved Oct 19, 2026.
17. AMAX: Brushless Motor 2004T Competition (product page on AMAXshop: the T-mount version, with the same spec and bench images). Retrieved Oct 19, 2026.