BrotherHobby VY 1504.5

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 $15.99

• 454 g at 13.2 A

  On BrotherHobby’s 16 V bench the 3950KV pulled 454 g at full throttle on a GF 3016 tri-blade, drawing 13.2 A.

  Source: BrotherHobby 3950KV test report

• 12 g with leads

  BrotherHobby weighs it at 12 g with 160 mm leads.

  Source: BrotherHobby product page

• 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, BrotherHobby spec sheet

• 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 suggests a 15 A ESC for all three versions (4S for the 2650KV and 3950KV, 6S for the 2950KV); its bench peaks were 11.9–14.6 A. (BrotherHobby 2650KV test report, BrotherHobby 2950KV test report, BrotherHobby 3950KV test report)

Props

3-inch tri-blades for the 2950KV and 3950KV (563 g on 6S and 454 g on 4S on a GF 3016); a 5-inch tri-blade for the 2650KV (619 g on a GF 5125 on 4S). (BrotherHobby 2650KV test report, BrotherHobby 2950KV test report, BrotherHobby 3950KV test report)

Battery

4S for the 2650KV and 3950KV, 6S for the 2950KV. (BrotherHobby product page, BrotherHobby 2950KV test report)

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 3950KV test report, BrotherHobby packing list)

Where to buy

• BrotherHobbythe maker’s store (this listing is titled CW); same price for every KV
  $15.99seen Oct 19, 2026
  Visit
• Pyrodrone3950KV
  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, φ19.2 mm. (BrotherHobby product page)
• Stator. 15 × 4.5 mm with 12 slots, in 0.15 mm Nippon Steel silicon steel. (BrotherHobby product page)
• Magnets. N52H arc magnets, 14 poles. (BrotherHobby spec sheet)
• Bearings. NSK, 5 × 2 × 2.5 mm. (BrotherHobby product page)
• Base. 7075 aluminium, with four M2 holes on a 12 mm circle; 24 AWG leads, 160 mm. (BrotherHobby product page)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 3950KV 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 × 4.5 mm stator, 19.2 mm bell, 14 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: VY 1504.5 Motor (CW) (product page on BrotherHobby’s store, with its spec list and photos). Retrieved Oct 19, 2026.
2. BrotherHobby: VY 1504.5 2650KV test report, 2020 (drawing, spec table and load test on a GF 5125 tri-blade at 16 V; image on the product page’s Tech Specs tab). Retrieved Oct 19, 2026.
3. BrotherHobby: VY 1504.5 2950KV test report, 2020 (drawing, spec table and load test on a GF 3016 tri-blade at 24 V; image on the Tech Specs tab). Retrieved Oct 19, 2026.
4. BrotherHobby: VY 1504.5 3950KV test report, 2020 (drawing, spec table and load test on a GF 3016 tri-blade at 16 V; image on the Tech Specs tab). Retrieved Oct 19, 2026.
5. BrotherHobby: VY 1504.5 specification and drawing (image on the product page). Retrieved Oct 19, 2026.
6. BrotherHobby: VY 1504.5 packing list (image on the product page). Retrieved Oct 19, 2026.