GEPRC EM3215

What it pulls

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

What you get for $31.99

• 4.1 kg on 6S

  The 900KV pulled 4,120.7 g at full throttle on a GF1050x3 at about 23.5 V, drawing 73.9 A at 14,873 rpm.

  Source: GEPRC datasheet

• Two windings

  The 900KV is wound with single-strand copper and the 750KV with multi-strand copper; both weigh 122 g with wire.

  Source: GEPRC product page, GEPRC spec image

• M5 steel shaft

  A 5 mm steel shaft with an M5 thread, standing 17.2 mm above the bell, with an M5 flange nut in the box.

  Source: GEPRC product page, GEPRC spec image, GEPRC drawing

• 19 × 19 mm base

  Four M3 holes on a 19 mm circle, with 300 mm 18 AWG silicone leads.

  Source: GEPRC product page, GEPRC drawing

What to pair it with

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

ESC

GEPRC recommends a 60–80 A ESC. Its datasheet peaks at 73.9 A for the 900KV on the GF1050x3 and 60.5 A for the 750KV on the 10x5x3. (GEPRC product page, GEPRC datasheet)

Props

9 to 10-inch for the 900KV, which GEPRC tested on an HQProp 9x4.5x3 and a GF1050x3; 10-inch for the 750KV, tested on a Gemfan 10x5x3. (GEPRC product page, GEPRC spec image, GEPRC datasheet)

Battery

6S (25.2 V). (GEPRC product page, GEPRC spec image)

Frame

Four M3 holes on a 19 × 19 mm pattern, with M3×8 screws in the box; GEPRC made it for 9 to 10-inch long-range builds. (GEPRC product page, GEPRC drawing)

Where to buy

• GEPRCthe maker’s store; 900KV or 750KV, same price
  $31.99seen 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 GEPRC’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:

• Shaft. A high-strength 5 mm steel shaft with an M5 thread. (GEPRC product page, GEPRC drawing)
• Stator. 12N14P with N52H magnets; single-strand copper windings on the 900KV, multi-strand on the 750KV. (GEPRC product page, GEPRC spec image)
• Bearings. NMB bearings. (GEPRC product page, GEPRC spec image)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 900KV 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 GEPRC’s published sizes: the 32 × 15 mm stator, 38.6 mm bell, 30.7 mm height, 5 mm shaft, 19 mm mounting circle and 12 teeth and 14 magnets. Anything GEPRC 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. GEPRC: EM3215 900KV/750KV Motor (product page, with a spec list for each KV). Retrieved Oct 19, 2026.
2. GEPRC: EM3215 specifications for both KVs (image on the product page). Retrieved Oct 19, 2026.
3. GEPRC: EM3215 product diagram (image on the product page). Retrieved Oct 19, 2026.
4. GEPRC: EM3215 datasheet, 900KV on an HQProp 9x4.5x3 and a GF1050x3 and 750KV on a Gemfan 10x5x3 (printed “Gefan”), 10–100% throttle at about 24 V with rpm (image on the product page). Each row’s voltage is as measured; the table’s voltage is its 10% row. GEPRC gives one motor temperature per prop, without saying after how long.. Retrieved Oct 19, 2026.
5. GEPRC: EM3215 on a scale, 122.0 g with its leads (image on the product page). Retrieved Oct 19, 2026.
6. GEPRC: EM3215 with its 300 mm leads (image on the product page). Retrieved Oct 19, 2026.
7. GEPRC: EM3215 900KV product photo (first gallery image). Retrieved Oct 19, 2026.
8. GEPRC: EM3215 from above, showing the five-spoke top (image on the product page). Retrieved Oct 19, 2026.