VCI Spark 1504

What it pulls

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

What you get for $12.00

• 450 g on 4S

  On VCI’s 16 V bench the 4000KV pulled 450 g on a GF 3016-3 at 13.85 A; at 24 V the 2900KV pulled 471 g on the same prop at 10.76 A.

  Source: VCI spec sheet

• Four KVs

  VCI sells it in 2450KV and 2900KV for 6S, and 3550KV and 4000KV for 4S.

  Source: VCI product page, VCI spec sheet

• About 11 g

  VCI gives 10.8 g to 10.9 g with the cable, depending on the KV.

  Source: VCI spec sheet

What to pair it with

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

ESC

VCI’s peak currents run from 9.44 A (2450KV) to 15.32 A (4000KV on a GF D63-3 at 16 V); pick an ESC rated above that per motor. (VCI spec sheet)

Props

VCI tested 63 mm ducted Gemfan props (D63-3 and D63-5) and a GF 3016-3; the GF 3016-3 made the most thrust. (VCI spec sheet)

Battery

6S for the 2450KV and 2900KV, 4S for the 3550KV and 4000KV, as VCI rates them. (VCI spec sheet)

Frame

Four M2 screws on a 12 × 12 mm pattern. (VCI drawing)

Where to buy

• VCI Hobbythe maker’s store; any KV
  $12.00seen 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 VCI’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:

• Magnets. N52SH arc magnets. (VCI spec sheet)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 4000KV 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 VCI’s published sizes: the 15 × 4 mm stator, 19 mm bell, 13.4 mm height, 1.5 mm shaft, 12 mm mounting circle and 12 teeth and 14 magnets. Anything VCI 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. VCI Hobby: VCI SPARK 1504 MOTOR-2450KV/2900KV/3550KV/4000KV (product page). Retrieved Oct 19, 2026.
2. VCI Hobby: Spark 1504 drawing (image on the product page’s Specifications tab). Retrieved Oct 19, 2026.
3. VCI Hobby: Spark 1504 spec sheets and testing data for the 2450KV and 2900KV at 24 V and the 3550KV and 4000KV at 16 V, on Gemfan props (image on the product page’s Specifications tab). VCI’s temperature is the shaft’s after a run from 0 to 100% throttle; its voltage column, the same on every row of a table, is left out.. Retrieved Oct 19, 2026.
4. VCI Hobby: Spark 1504 2450KV product photo (first gallery image). Retrieved Oct 19, 2026.
5. VCI Hobby: Spark 1504 top-view photo (second gallery image). Retrieved Oct 19, 2026.