GEPRC SPEEDX2 2809
| Stator | 2809 |
|---|---|
| KV options | 1280 |
| Weight | 71.4 g |
| Shaft | 5mm |
| Max cells | 6S |
| Configuration | 12N14P |
| Dimensions | Ø36.04x36.53 mm |
| Mount | 19x19mm (M3) |
| Winding resistance | 42 mOhm |
| Max thrust | 3502.1 g |
| Price (approx.) | 35.99 USD |
Best props for the SPEEDX2 2809
7-8 inch (GEPRC; bench-tested on Gemfan 7040-3 and Gemfan 8040-3)
Thrust data (GEPRC bench test)
| KV | Prop | Battery | Throttle | Current | RPM | Thrust | Efficiency |
|---|---|---|---|---|---|---|---|
| 1280 | Gemfan 7040-3 | 6S | 50 | 9.76 A | — | 862.8 g | 3.68 g/W |
| 1280 | Gemfan 7040-3 | 6S | 60 | 13.34 A | — | 1092.6 g | 3.42 g/W |
| 1280 | Gemfan 7040-3 | 6S | 70 | 19.32 A | — | 1405.1 g | 3.05 g/W |
| 1280 | Gemfan 7040-3 | 6S | 81 | 25.19 A | — | 1718.3 g | 2.88 g/W |
| 1280 | Gemfan 7040-3 | 6S | 90 | 36.23 A | — | 2251.5 g | 2.64 g/W |
| 1280 | Gemfan 7040-3 | 6S | 100 | 46.74 A | — | 2559.1 g | 2.35 g/W |
| 1280 | Gemfan 8040-3 | 6S | 50 | 14.28 A | — | 1226.7 g | 3.6 g/W |
| 1280 | Gemfan 8040-3 | 6S | 60 | 20.8 A | — | 1637.5 g | 3.3 g/W |
| 1280 | Gemfan 8040-3 | 6S | 70 | 31.08 A | — | 2186.2 g | 2.9 g/W |
| 1280 | Gemfan 8040-3 | 6S | 80 | 39.4 A | — | 2488.4 g | 2.7 g/W |
| 1280 | Gemfan 8040-3 | 6S | 92 | 54.41 A | — | 2980.1 g | 2.3 g/W |
| 1280 | Gemfan 8040-3 | 6S | 100 | 68.52 A | — | 3502.1 g | 2.2 g/W |
Manufacturer bench figures (GEPRC bench, 1280 KV at 6S, 6 throttle points (50-100%) on each of two props (Gemfan 7040-3, Gemfan 8040-3)); real-world thrust varies with ESC, battery sag and prop condition.
Thrust-to-weight with this motor
RPM & prop speed on this motor
Props in this motor's class
| Prop | Size | Blades | Weight |
|---|---|---|---|
| APC 7x4 SF-B4 2-Blade | 7.0x4.0 | 2 | 5.1 g |
| HQProp 7x5.5x2 | 7.0x5.5 | 2 | 6.4 g |
| Gemfan Cinelifter 7035 7x3.5x3 | 7.0x3.5 | 3 | 6.5 g |
| HQProp 7x4.5x2 Durable | 7.0x4.5 | 2 | 6.6 g |
| HQProp MacroQuad 7x4.5 Glass Fiber Nylon CCW | 7.0x4.5 | 2 | 6.8 g |
Where this data comes from
The rows are GEPRC's own bench table, published as an image in the description gallery of its product page on geprc.com - the seventh brand this dataset has read a manufacturer sheet from. This 2023 product uses a different template from the 2024 E series: its 'Motor Data Sheet' prints a MEASURED voltage per row (24.02 V down to 22.8 V as the pack sags), six throttle points rather than ten, two props named in full, and two odd steps - 81% on the 7040-3 run and 92% on the 8040-3 - which are the source's own. No per-row RPM. Every row reproduces its printed Power as Voltage x Current and its printed Efficiency as Thrust / Power. Identity with GEPRC's Specifications block is 1280 KV, a 28x9 mm stator, 12N14P, a Ø5 mm shaft, 25.2 V 6S and 71.4 g. **The block's Maximum power (1148.9 W) and Maximum current (49.35 A) do not land on this table**: they belong to a separate full-throttle run GEPRC advertises in another description image (23.28 V, 49.35 A, 1148.9 W, 2944 g, quoted as 3.08 g/W on the Gemfan 7040-3, 60 C after 10 s). That panel contradicts the sheet's own 7040-3 100% row (23.25 V, 46.74 A, 2559.1 g, 1086.8 W, 2.35 g/W) and it does not even reproduce itself - 2944 g / 1148.9 W is 2.56 g/W, not 3.08 - so the table is what is published here and the panel is recorded rather than merged. max_thrust_g is the table's own maximum, the Gemfan 8040-3 100% row. Sheet temperatures: 60 C on the 7040-3 run, 65 C on the 8040-3 run.