BrotherHobby TC 2004

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 $19.99

• 977 g from 14.9 g

  On BrotherHobby’s 24 V bench the 1950KV pulled 977 g at full throttle on a GF T-mount 51 × 25 × 3, drawing 18.8 A; the 3150KV pulled 1,036 g on 16 V.

  Source: BrotherHobby 1950KV and 2100KV load tests, BrotherHobby 3150KV load test

• For sub-250 g 5-inch

  BrotherHobby calls it an ultralight motor for sub-250 g 5-inch racing.

  Source: BrotherHobby title image

• NMB 7 × 3 × 3 bearings

  Japanese NMB bearings, 7 × 3 × 3 mm, in a 7075 aluminium bell and base.

  Source: BrotherHobby product page

• Wire rated to 260 °C

  BrotherHobby says its winding wire resists 260 °C.

  Source: BrotherHobby spec sheet

What to pair it with

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

ESC

BrotherHobby gives no ESC rating. Its bench peaks were 18.8 A (1950KV on 6S), 13.4 A (2100KV on 4S) and 32.5 A (3150KV on 4S), so the 3150KV needs much more ESC than the others. (BrotherHobby 1950KV and 2100KV load tests, BrotherHobby 3150KV load test)

Props

5-inch tri-blades on a 1.5 mm T-mount: on a GF 51 × 25 × 3 the 1950KV pulled 977 g on 24 V, the 2100KV 670 g and the 3150KV 1,036 g on 16 V. (BrotherHobby spec sheet, BrotherHobby 1950KV and 2100KV load tests, BrotherHobby 3150KV load test)

Battery

6S for the 1700KV and 1950KV, 4S for the 2100KV and 3150KV. (BrotherHobby spec sheet)

Frame

Four M2 holes on a 12 mm circle (12 × 12 mm). Four M2 × 6 base screws and two M2 × 7 prop screws come in the box. (BrotherHobby product page, BrotherHobby drawing, BrotherHobby packing list)

Where to buy

• BrotherHobbythe maker’s store; same price for every KV
  $19.99seen 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, φ24.6 mm. (BrotherHobby product page)
• Stator. 20 × 4 mm with 12 slots, in 0.15 mm Nippon silicon steel. (BrotherHobby product page)
• Magnets. N52H arc magnets, 14 poles. (BrotherHobby product page)
• Shaft. SUS420 stainless steel, 1.5 mm. (BrotherHobby product page)
• Bearings. NMB, 7 × 3 × 3 mm. (BrotherHobby product page)
• Base. 7075 aluminium, with four M2 holes on a 12 mm circle; 24 AWG leads, 16 cm. (BrotherHobby product page)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 1950KV 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 20 × 4 mm stator, 24.6 mm bell, 13.4 mm height, 1.5 mm shaft, 12 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: TC 2004 Ultralight Motor (product page on BrotherHobby’s store, with its spec list and photos). Retrieved Oct 19, 2026.
2. BrotherHobby: TC 2004 specification (image on the product page). Retrieved Oct 19, 2026.
3. BrotherHobby: TC 2004 dimension drawing (image on the product page). Retrieved Oct 19, 2026.
4. BrotherHobby: TC 2004 1950KV (24 V) and 2100KV (16 V) load test data on a GF T-mount 51 × 25 × 3 tri-blade (image on the product page). Copper temperatures are after two minutes at full throttle.. Retrieved Oct 19, 2026.
5. BrotherHobby: TC 2004 3150KV load test data on the same prop at 16 V (image on the product page). Retrieved Oct 19, 2026.
6. BrotherHobby: TC 2004 title image, "Ultralite powerful design for sub-250g 5" racing" (image on the product page). Retrieved Oct 19, 2026.
7. BrotherHobby: TC 2004 packing list (image on the product page). Retrieved Oct 19, 2026.