7- to 8-inch FPV motor
RCinPower EX2809 Plus
A 57.6 g 2809 in 1280KV that RCinPower tested on 7- and 8-inch three-blades at 24 V, pulling 2,612–3,480 g per motor at full throttle.
- 7- and 8-inch quads
- 4S–6S
- 7- and 8-inch three-blade props
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 2809 motor drawn from RCinPower’s published sizes, not its exact design. Thrust, current and power are RCinPower’s bench figures for the Gemfan 8040, 3-blade prop at 24 V, read straight across between its throttle steps. Its data starts at 25% throttle.
- Max thrust
- 3,480 g
- Gemfan 8040, 3-blade prop, 24 V
- Weight
- 57.6 g
- with 3 cm leads; RCinPower's scale photo shows 57.53 g (S4)
- Peak current
- 68.0 A
- full throttle
- Max power
- 1,632 W
- full throttle
from $29.99a motor at Pyrodrone
A set of four: $119.96
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What it pulls
RCinPower’s own bench test, one line per prop. Drag across the chart to move the throttle; the model above follows.
At 60% with the Gemfan 8040, 3-blade: 1,697 g of thrust, 24.5 A, 588 W, 3.10 g per watt.
On your quad
21.4 : 1
Thrust to weight at full throttle: four motors pull 13,920 g with the Gemfan 8040, 3-blade at 24 V.
At 60% throttle they pull 6,789 g, 10.4 times the quad’s weight.
All-up weight is the quad ready to fly, with its battery and camera. The thrust is the maker’s static bench figure; in the air it is lower.
What you get for $29.99
Bench data from 25% to full throttle
Two 7-inch and two 8-inch three-blades at 24 V, in four throttle steps, with the temperature after 5 s at full throttle.
Source: RCinPower spec sheet
Most efficient at low current
RCinPower gives over 85% efficiency at 5–10 A.
Source: RCinPower spec sheet
57.6 g
57.6 g with 3 cm leads in the spec table; RCinPower's scale photo shows 57.53 g.
What to pair it with
Our reading of RCinPower’s numbers, so your build matches what the motor was tested with.
- ESC
- At full throttle on 6S it drew 49.6–53.5 A on the 7-inch props and 66.3–68 A on the 8-inch props (83–85 °C; RCinPower marks the Gemfan 8040 run hot). RCinPower rates it at 68 A. An ESC rated for about 55 A per motor covers 7-inch props; 8-inch props need 70 A. (RCinPower spec sheet)
- Props
- The 8-inch Gemfan 8040 three-blade pulled the most, 3,480 g, and at full throttle was nearly as efficient as the 7-inch props; the HQProp 8045 was the least efficient. The 7-inch DALProp 7056 and Gemfan 7040 pulled 2,742 g and 2,612 g and ran cooler. (RCinPower spec sheet)
- Battery
- 4S–6S; RCinPower tested it on 6S. (RCinPower spec sheet)
- Frame
- Four M3 screws, opposite holes 19 mm apart. (RCinPower spec sheet)
Where to buy
- Pyrodrone1280KV$29.99seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 1,280 rpm/V | RCinPower spec sheet |
| Stator | 28 × 9 mm (2809) | RCinPower spec sheet |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) | RCinPower spec sheet |
| Battery | 4S–6S LiPo | RCinPower spec sheet |
| Weight | 57.6 g (with 3 cm leads; RCinPower's scale photo shows 57.53 g (S4)) | RCinPower spec sheet |
| Dimensions | φ33.3 × 23.1 mm (without the shaft) | RCinPower spec sheet |
| Shaft | 4 mm hollow; 5 mm across the thread, which stands 14.5 mm above the bell | RCinPower spec sheet |
| Mounting | 4 × M3 holes, opposite holes 19 mm apart (19 × 19) | RCinPower spec sheet, RCinPower spec sheet (mirror) |
| Internal resistance | 60 mΩ | RCinPower spec sheet |
| No-load current | 1.3 A (at 10 V) | RCinPower spec sheet |
| Max current | 68 A (RCinPower labels it 5S; it is the same as its highest bench reading (Gemfan 8040 three-blade at 24 V)) | RCinPower spec sheet |
| Max continuous power | 1,632 W (RCinPower labels it 5S; it is the same as its Gemfan 8040 reading at 24 V) | RCinPower spec sheet |
Bench data
Redrawn from RCinPower’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.
1280KV on 4S–6S, 24 V4 props
| Prop | Throttle | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| Gemfan 8040, 3-blade (GF8040*3)motor at 85 °C | 25% | 4.5 | 605 | 108 | 5.602 |
| 50% | 14.8 | 1,230 | 355.2 | 3.463 | |
| 75% | 39 | 2,398 | 936 | 2.562 | |
| 100% | 68 | 3,480 | 1632 | 2.132 | |
| HQProp 8045, 3-blade (HQ8045*3)motor at 83 °C | 25% | 4.6 | 598 | 110.4 | 5.417 |
| 50% | 15.9 | 1,219 | 381.6 | 3.194 | |
| 75% | 39 | 2,250 | 936 | 2.404 | |
| 100% | 66.3 | 3,079 | 1591.2 | 1.935 | |
| DALProp 7056, 3-blade (DAL7056*3)motor at 77 °C | 25% | 4.4 | 564 | 105.6 | 5.341 |
| 50% | 10.7 | 1,054 | 256.8 | 4.104 | |
| 75% | 27.6 | 1,809 | 662.4 | 2.731 | |
| 100% | 53.5 | 2,742 | 1284 | 2.136 | |
| Gemfan 7040, 3-blade (GF7040*3)motor at 76 °C | 25% | 4.2 | 538 | 100.8 | 5.337 |
| 50% | 10.2 | 1,004 | 244.8 | 4.101 | |
| 75% | 26.1 | 1,723 | 626.4 | 2.751 | |
| 100% | 49.6 | 2,612 | 1190.4 | 2.194 |
Source: RCinPower spec sheet
Inside the motor
A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:
- Shaft. 4 mm hollow; 5 mm across the thread, which stands 14.5 mm above the bell. (RCinPower spec sheet)
- Stator. The coils are wound on a stack of thin steel laminations: 28 × 9 mm (2809). (RCinPower spec sheet)
- Base. 4 × M3 holes, opposite holes 19 mm apart (19 × 19). (RCinPower spec sheet, RCinPower spec sheet (mirror))
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 1280KV 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.
| Battery | Volts | No-load rpm (KV × V) | Electrical frequency | ESC steps per second |
|---|---|---|---|---|
| 4S nominal | 14.8 | 18,944 | 2,210 Hz | 13,261 |
| 4S full | 16.8 | 21,504 | 2,509 Hz | 15,053 |
| 6S nominal | 22.2 | 28,416 | 3,315 Hz | 19,891 |
| 6S full | 25.2 | 32,256 | 3,763 Hz | 22,579 |
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 RCinPower’s published sizes: the 28 × 9 mm stator, 33.3 mm bell, 23.1 mm height, 5 mm shaft, 19 mm mounting circle and 12 teeth and 14 magnets. Anything RCinPower 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
- RCinPower: EX2809 Plus (product page; its content is four images with photos, the spec table, dimension drawing and bench data). Retrieved Oct 19, 2026.
- RCinPower: EX2809 Plus photos (first image on the product page, with the main product photo), used for finish. Retrieved Oct 19, 2026.
- RCinPower: EX2809 Plus photos (second image on the product page: the 1280KV on a quad, the stator, and the base with its leads). Retrieved Oct 19, 2026.
- RCinPower: EX2809 Plus photos (third image on the product page, with a scale photo at 57.53 g). Retrieved Oct 19, 2026.
- RCinPower: EX2809 Plus spec sheet (fourth image on the product page: the EX-2809 1280KV spec table, drawing and bench tables at 24 V from 25% to 100% throttle, with temperatures after 5 s at full throttle). Retrieved Oct 19, 2026.
- RCinPower: EX-2809 1280KV spec sheet at a higher resolution (RCinPower's own sheet, the same as S5, mirrored on Pyrodrone's Shopify CDN), used to read the drawing's small labels. Retrieved Oct 19, 2026.
