GEPRC SPEEDX2 1303.5

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

• About 390 g on 6S

  The 3800KV pulled 392 g at full throttle on a GF3016*3 at 22.2 V, drawing 6.3 A; the 5500KV pulled 361 g on the same prop at 14.8 V, at 8.7 A.

  Source: GEPRC data table, GEPRC test infographic

• 6.5 g with leads

  A one-piece 7075-T aluminium bell with a largely open top keeps it to 6.5 g with 90 mm leads.

  Source: GEPRC product page, GEPRC weight image

• Raised prop platform

  The prop sits on a platform 1.9 mm above the bell, which GEPRC says suits inverted props and keeps high-pitch props off the top of the rotor.

  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 35 A ESC and ran its full-throttle tests with a 45 A ESC; its tables peak at 8.8 A for the 5500KV and 6.3 A for the 3800KV. (GEPRC product page, GEPRC data table, GEPRC test infographic)

Props

GEPRC tested GF2540, GF3016*2, GF3016*3 and HQ 3*2.5*3 props, and says the 1.5 mm shaft takes the usual 2 to 2.5-inch props. (GEPRC product page, GEPRC data table)

Battery

4S for the 5500KV (rated 2S–4S), 6S for the 3800KV (rated 4S–6S). (GEPRC product page, GEPRC spec image, GEPRC test infographic)

Frame

Four M2 holes on a 9 × 9 mm pattern, with M2×6 and M2×8 screws in the box. (GEPRC product page, GEPRC drawing)

Where to buy

• GEPRCthe maker’s store; 3800KV or 5500KV, same price; the 5500KV in stock, the 3800KV out of stock when checked
  $15.99seen 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:

• Bell. One-piece 7075-T aluminium with a bladed, largely open top that GEPRC says lets in more air and keeps the motor cooler, and a raised platform for the prop. (GEPRC product page)
• Stator. 9N12P with N52H arc magnets and what GEPRC calls a low internal loss stator. (GEPRC product page, GEPRC features image)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 5500KV 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 12-pole rotor has 6 pole pairs, so every turn of the shaft is 6 electrical cycles, and a six-step ESC switches the phases 36 times per turn.

About the 3D model

A generic outrunner drawn from GEPRC’s published sizes: the 13 × 3.5 mm stator, 17.35 mm bell, 11.7 mm height, 1.5 mm shaft, 9 mm mounting circle and 9 teeth and 12 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: SPEEDX2 1303.5 3800KV/5500KV Motor (product page, with the spec list for each KV). Retrieved Oct 19, 2026.
2. GEPRC: SPEEDX2 1303.5 product drawing (image on the product page). Retrieved Oct 19, 2026.
3. GEPRC: SPEEDX2 1303.5 specifications for each KV (image on the product page). Retrieved Oct 19, 2026.
4. GEPRC: SPEEDX2 1303.5 motor data table, 3800KV at 14.8 V and 22.2 V and 5500KV at 7.4 V, 11.1 V and 14.8 V on four 2.5 to 3-inch props, 50% and 100% throttle (image on the product page). The table gives the temperatures after 3 s at full throttle; GEPRC marks 83 °C and above as hot.. Retrieved Oct 19, 2026.
5. GEPRC: SPEEDX2 1303.5 full-throttle results on a GF3016*3 with an F45A ESC, 5500KV at 14.8 V and 3800KV at 22.2 V, 84 °C and 83 °C after 5 s, ambient 25 °C; GEPRC suggests 6S for the 3800KV and 4S for the 5500KV (infographic on the product page). Retrieved Oct 19, 2026.
6. GEPRC: SPEEDX2 1303.5 weight, 6.5 g with wire (image on the product page). Retrieved Oct 19, 2026.
7. GEPRC: SPEEDX2 1303.5 efficiency (N52H magnets, low-loss stator; image on the product page). Retrieved Oct 19, 2026.
8. GEPRC: SPEEDX2 1303.5 product photo, two motors (first gallery image). Retrieved Oct 19, 2026.
9. GEPRC: SPEEDX2 1303.5 from above, showing the five blades of the top (gallery image). Retrieved Oct 19, 2026.
10. GEPRC: SPEEDX2 1303.5 sizes: 1.5 mm shaft, 16.4 mm overall, 17.4 mm across, 90 mm leads (gallery image). Retrieved Oct 19, 2026.