BrotherHobby SE 2812

What it pulls

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

What you get for $21.00

• 3 kg on a 9-inch prop

  On BrotherHobby’s 6S bench the 900KV pulled 3,054 g at full throttle on an HQ 9 × 5 × 3, drawing 45.3 A.

  Source: BrotherHobby 900KV test report, BrotherHobby thrust summary

• 2.6 kg on a 7-inch prop

  The 1115KV pulled 2,640 g on an HQ 7 × 4 × 3 at 25.2 V, drawing 42.6 A.

  Source: BrotherHobby 1115KV test report

• Hard-anodised 7075

  Bell cap and base in 7075 aluminium with a hard-anodised finish, on a SUS420 heat-treated steel shaft.

  Source: BrotherHobby product page, BrotherHobby infographic and drawing

• Balanced to 3 mg

  The test reports give a dynamic-balance standard of 3 mg or less, insulation resistance of 0.5 MΩ or more and a passed coil test.

  Source: BrotherHobby 900KV test report, BrotherHobby 1115KV test report

What to pair it with

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

ESC

BrotherHobby lists a 6S 50 A ESC for both KVs; full-throttle peaks were 45.3 A (900KV) and 42.6 A (1115KV). (BrotherHobby 900KV test report, BrotherHobby 1115KV test report, BrotherHobby thrust summary)

Props

BrotherHobby pairs it with 9-inch props: the 900KV pulled 3,054 g on an HQ 9 × 5 × 3. It tested the 1115KV on an HQ 7 × 4 × 3: 2,640 g. (BrotherHobby prop image, BrotherHobby 900KV test report, BrotherHobby 1115KV test report)

Battery

6S for both KVs. (BrotherHobby product page, BrotherHobby 900KV test report, BrotherHobby 1115KV test report)

Frame

Four M3 holes on a 19 mm circle (19 × 19 mm); four M3 × 8 screws and an M5 flange nut come in the box. (BrotherHobby product page, BrotherHobby infographic and drawing, BrotherHobby packing list)

Where to buy

• BrotherHobbythe maker’s store; same price for both KVs
  $21.00seen 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 BrotherHobby’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. 7075 aluminium bell cap, φ33.9 mm, hard anodised, with five spokes. (BrotherHobby product page, BrotherHobby infographic and drawing)
• Shaft. SUS420 heat-treated steel with an M5 thread, standing 16 mm above the bell. (BrotherHobby product page, BrotherHobby infographic and drawing)
• Magnets. N52H arc magnets, 14 poles. (BrotherHobby product page, BrotherHobby infographic and drawing)
• Stator. 28 × 12 mm with 12 slots, in 0.2 mm Kawasaki silicon steel, wound with TU1-grade enamelled wire. (BrotherHobby product page, BrotherHobby infographic and drawing, BrotherHobby 900KV test report)
• Bearings. NMB, 12 × 6 × 4 mm. (BrotherHobby product page)
• Base. 7075 aluminium, with four M3 holes on a 19 mm circle and 18 AWG leads 250 mm long. (BrotherHobby product page, BrotherHobby infographic and drawing)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 900KV 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 BrotherHobby’s published sizes: the 28 × 12 mm stator, 33.9 mm bell, 26.25 mm height, 5 mm shaft, 19 mm mounting circle and 12 teeth and 14 magnets. Anything BrotherHobby 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. BrotherHobby: SE 2812 900KV Motor (CW) (product page on BrotherHobby’s store, with its spec list, photos and Test Data tab; it sells 900KV and 1115KV). Retrieved Oct 19, 2026.
2. BrotherHobby: SE 2812 weight, maximum thrust and 900KV full-throttle summary, with the ESC (image on the product page). Retrieved Oct 19, 2026.
3. BrotherHobby: SE 2812 “paired with 9 inch prop” (image on the product page). Retrieved Oct 19, 2026.
4. BrotherHobby: SE 2812 exploded view (shaft, caps, magnets, bearings, wire, stator steel) and dimension drawing (image on the product page). Retrieved Oct 19, 2026.
5. BrotherHobby: SE 2812 packing list (image on the product page). Retrieved Oct 19, 2026.
6. BrotherHobby: SE 2812-900KV test report on 6S with an HQ 9 × 5 × 3, 2022 bench, with drawing and spec table (image on the Test Data tab). The copper temperature is after two minutes at full throttle.. Retrieved Oct 19, 2026.
7. BrotherHobby: SE 2812-1115KV test report at 25.2 V with an HQ 7 × 4 × 3 glass-fibre nylon prop, 2022 bench, with drawing and spec table (image on the Test Data tab). Retrieved Oct 19, 2026.