BrotherHobby VY 1507

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 $17.99

• 879 g on a 3-inch prop

  On BrotherHobby’s 24 V bench the 3100KV pulled 879 g at full throttle on an HQ 3 × 4 × 3, drawing 27.4 A.

  Source: BrotherHobby 3100KV test report

• M5 shaft

  The 5 mm shaft takes an M5 prop nut and stands 12 mm above the bell.

  Source: BrotherHobby 3100KV test report

• NSK bearings, N52H magnets

  Japanese NSK 5 × 2 × 2.5 mm bearings and N52H arc magnets, 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 product page

What to pair it with

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

ESC

BrotherHobby suggests a 30 A ESC for the 3100KV (6S) and 4150KV (4S), and 15 A for the 1550KV (6S) and 1900KV (4S). Its bench peaks were 27.4 A and 29.6 A, and 13.5 A and 14.9 A. (BrotherHobby setup suggestions, BrotherHobby 1550KV test report, BrotherHobby 1900KV test report, BrotherHobby 3100KV test report, BrotherHobby 4150KV test report)

Props

3-inch tri-blades for the 3100KV and 4150KV (879 g and 695 g on an HQ 3 × 4 × 3); 5-inch tri-blades for the 1550KV and 1900KV (762 g on a GF 5143, 617 g on an HQ 5141). (BrotherHobby 1550KV test report, BrotherHobby 1900KV test report, BrotherHobby 3100KV test report, BrotherHobby 4150KV test report)

Battery

6S for the 1550KV and 3100KV, 4S for the 1900KV and 4150KV. (BrotherHobby product page)

Frame

Four M2 holes on a 12 mm circle (12 × 12 mm). Four M2 screws and an M5 nut come in the box. (BrotherHobby product page, BrotherHobby 3100KV test report, BrotherHobby packing list)

Where to buy

• BrotherHobbythe maker’s store; same price for every KV
  $17.99seen Oct 19, 2026
  Visit
• RaceDayQuads4150KV
  price on the store’s page
  Visit
• Pyrodrone3100KV
  price on the store’s page
  Visit
• GetFPVchoose the KV
  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. 7075 aluminium bell cap, φ19.4 mm. (BrotherHobby product page)
• Stator. 15 × 7 mm with 12 slots, in 0.15 mm Nippon Steel silicon steel. (BrotherHobby product page)
• Magnets. N52H arc magnets, 14 poles. (BrotherHobby product page)
• Bearings. NSK, 5 × 2 × 2.5 mm. (BrotherHobby product page)
• Winding. Copper wire rated to 260 °C; 24 AWG leads, 160 mm. (BrotherHobby product page)
• Base. 7075 aluminium, with four M2 holes on a 12 mm circle. (BrotherHobby product page)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 3100KV 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 15 × 7 mm stator, 19.4 mm bell, 16.1 mm height, 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: VY 1507 Motor (product page on BrotherHobby’s store, with its spec list and photos). Retrieved Oct 19, 2026.
2. BrotherHobby: VY 1507 1550KV test report, 2020 (drawing, spec table and load test on a GF 5143 × 3 at 24 V; image on the product page’s Tech Specs tab). Retrieved Oct 19, 2026.
3. BrotherHobby: VY 1507 1900KV test report, 2020 (spec table and load test on an HQ 5141 × 3 at 16 V; image on the Tech Specs tab). Retrieved Oct 19, 2026.
4. BrotherHobby: VY 1507 3100KV test report, 2019 (drawing, spec table and load test on an HQ 3 × 4 × 3 at 24 V; image on the Tech Specs tab). Retrieved Oct 19, 2026.
5. BrotherHobby: VY 1507 4150KV test report, 2019 (spec table and load test on an HQ 3 × 4 × 3 at 16 V; image on the Tech Specs tab). Retrieved Oct 19, 2026.
6. BrotherHobby: VY 1507 setup suggestions, one per KV with prop, voltage and ESC (image on the product page). Retrieved Oct 19, 2026.
7. BrotherHobby: VY 1507 packing list (image on the product page). Retrieved Oct 19, 2026.