BrotherHobby Special Edition V4 32.5-12

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 $33.99

• 4.2 kg on a 10-inch prop

  On BrotherHobby’s 6S bench the 950KV pulled 4,183 g at full throttle on an HQ 10 × 5 × 3, drawing 64.4 A.

  Source: BrotherHobby 950KV test report, BrotherHobby parameters

• Efficient on a 13-inch prop

  The 580KV on a Gemfan 13 × 8 × 3 made 918 g at 30% throttle for 107.93 W (8.51 g/W) and 3,881 g at full throttle (4.14 g/W).

  Source: BrotherHobby 580KV test report

• Hard-anodised 7075

  Bell cap and base in hard-anodised 7075 aluminium, hollowed out to save weight and help cooling.

  Source: BrotherHobby infographic, BrotherHobby drawing

• TU1 wire, N52H magnets

  TU1 enamelled wire with a high slot fill, and N52H arc magnets at a consistent air gap.

  Source: BrotherHobby infographic, BrotherHobby drawing

• Balanced to 3 mg

  Each test report gives a dynamic-balance standard of 3 mg or less, insulation resistance of at least 0.5 MΩ and a passed coil test.

  Source: BrotherHobby 580KV test report, BrotherHobby 950KV test report, BrotherHobby 1050KV 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 45 A ESC for the 580KV, 6S 65 A for the 950KV and 6S 80 A for the 1050KV; their full-throttle peaks were 37.5 A, 64.4 A and 70.5 A. (BrotherHobby parameters, BrotherHobby 580KV test report, BrotherHobby 950KV test report, BrotherHobby 1050KV test report)

Props

A Gemfan 13 × 8 × 3 for the 580KV (3,881 g at full throttle), an HQ 10 × 5 × 3 for the 950KV (4,183 g) and an HQ 9 × 5 × 3 for the 1050KV (3,986 g). (BrotherHobby infographic, BrotherHobby 580KV test report, BrotherHobby 950KV test report, BrotherHobby 1050KV test report)

Battery

6S for all three KVs. (BrotherHobby product page, BrotherHobby parameters)

Frame

Four M3 holes on a 19 mm circle (19 × 19 mm); the shaft takes an M5 prop nut. (BrotherHobby product page, BrotherHobby drawing)

Where to buy

• BrotherHobbythe maker’s store; same price for every KV
  $33.99seen Oct 19, 2026
  Visit
• GetFPV580KV or 950KV
  price on the store’s page
  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. Hard-anodised 7075 aluminium, φ38.2 mm, with five spokes round a textured hub 14.2 mm across. (BrotherHobby infographic, BrotherHobby drawing)
• Shaft. Hollow titanium alloy, 5 mm with an M5 thread, standing 18 mm above the bell. (BrotherHobby product page, BrotherHobby drawing)
• Magnets. N52H arc magnets, 14 poles. (BrotherHobby product page, BrotherHobby drawing)
• Stator. 32.5 × 12 mm with 12 slots, in thin non-oriented silicon steel, wound with TU1 enamelled wire. (BrotherHobby drawing, BrotherHobby 950KV test report)
• Bearings. NMB, 12 × 6 × 4 mm. (BrotherHobby product page)
• Base. 7075 aluminium, with four M3 holes on a 19 mm circle and 16 AWG leads 250 mm long. (BrotherHobby product page, BrotherHobby drawing)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 950KV 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 32.5 × 12 mm stator, 38.2 mm bell, 27.7 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: Special Edition V4 32512 580KV/950KV/1050KV Motor (CW) (product page on BrotherHobby’s store, with its spec list, photos and Test Data tab). Retrieved Oct 19, 2026.
2. BrotherHobby: Special Edition V4 32.5-12 introduction, KVs and the prop for each (image on the product page). Retrieved Oct 19, 2026.
3. BrotherHobby: Special Edition V4 32.5-12 bell, winding and magnets (image on the product page). Retrieved Oct 19, 2026.
4. BrotherHobby: Special Edition V4 32.5-12 exploded view with materials and the dimension drawing (image on the product page). Retrieved Oct 19, 2026.
5. BrotherHobby: Special Edition V4 32512 parameters: KVs, maximum thrust, weight, ESCs, battery, size and props (image on the product page). Retrieved Oct 19, 2026.
6. BrotherHobby: V4 32512 580KV test report on 6S with a Gemfan 13 × 8 × 3, 2022 bench (image on the Test Data tab). Retrieved Oct 19, 2026.
7. BrotherHobby: V4 32512 950KV test report on 6S with an HQ 10 × 5 × 3, 2022 bench (image on the Test Data tab). Retrieved Oct 19, 2026.
8. BrotherHobby: V4 32512 1050KV test report on 6S with an HQ 9 × 5 × 3, 2022 bench (image on the Test Data tab). Retrieved Oct 19, 2026.