7-inch FPV long-range motor
EMAX ECO III 2807
A 7-inch motor for long range, freestyle and cinematic rigs: 2807 stator, single-strand windings, 49.6 g without leads, and up to 2,580 g of pull per motor on EMAX’s 6S bench (1500KV).
- 7-inch long range and freestyle
- 6S (1300KV, 1500KV) or 4S (1700KV)
- 6 to 7-inch props
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 2807 motor drawn from EMAX’s published sizes, not its exact design. No-load speed is KV × 22.2 V, a nominal pack for this version. EMAX’s bench tables for it step by thrust rather than throttle, so they are in the bench data below, not on this readout.
- Max thrust
- 2,290 g
- EMAX Avia 7035 prop, 25.2 V
- Weight
- 49.6 g
- without leads; the same for all three KVs
- Peak current
- 32.4 A
- full throttle
- Max power
- 816 W
- full throttle
Plain links: we earn nothing from them.
What you get
2.6 kg of pull on 6S
On EMAX’s 25.2 V bench the 1500KV pulled 2,580 g at full throttle on an EMAX Avia 7040, drawing 51.3 A.
Source: EMAX thrust tables
5.78 g/W at 300 g
Making 300 g of thrust on 6S, the 1300KV ran at 5.78 g/W on an EMAX Avia 7035.
Source: EMAX thrust tables
Single-strand windings
EMAX winds the E3 series with single strands, which it says lowers electrical resistance and helps the motor shed heat.
Source: EMAX USA product page
7075 aluminium, hardened steel shaft
EMAX says the E3 series uses 7075 aluminium to stand up to repeated crashes, with a hardened steel shaft and N52SH arc magnets.
Source: EMAX USA product page
What to pair it with
Our reading of EMAX’s numbers, so your build matches what the motor was tested with.
- ESC
- EMAX rates the peak current at 55 A (1300KV, 6S), 63 A (1500KV, 6S) and 54 A (1700KV, 4S). On its bench the 1500KV drew 51.3 A at full throttle on 6S. A 55 A ESC covers the 1300KV and 1700KV; for the 1500KV on 6S, choose one rated for at least 63 A. (EMAX spec sheet, EMAX thrust tables)
- Props
- EMAX lists 6 to 7-inch props and tested its own three-blade Avias: on a 7035 the 1300KV pulled 2,290 g on 6S and the 1700KV 1,760 g on 4S; on a 7040 the 1500KV pulled 2,580 g on 6S. (EMAX spec sheet, EMAX thrust tables)
- Battery
- 6S for the 1300KV and 1500KV, which EMAX rates for 3S–6S and tested at 25.2 V; 4S for the 1700KV, rated for 3S–4S and tested at 16.8 V. (EMAX spec sheet, EMAX thrust tables)
- Frame
- Four M3 holes on a 19 mm circle (19 × 19 mm). (EMAX spec sheet)
Where to buy
- EMAX USAthe maker’s US store; same price for every KV (the 1300KV was listed as sold out)$19.99seen Oct 19, 2026Visit
- EMAXthe maker’s global store (the 1300KV was listed as sold out)$30.78seen Oct 19, 2026Visit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 1,300 rpm/V (also 1500KV and 1700KV) | EMAX USA product page |
| Stator | 28 × 7 mm (2807) | EMAX USA product page |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) | EMAX spec sheet |
| Battery | 3S–6S LiPo (1300KV, 1500KV); 3S–4S (1700KV) | EMAX spec sheet |
| Weight | 49.6 g (without leads; the same for all three KVs) | EMAX spec sheet |
| Dimensions | φ34.8 × 34.9 mm (with shaft); 28.4 mm from the bottom of the bell to the shaft tip | EMAX spec sheet |
| Shaft | Hardened steel, M5 thread, protrudes 14 mm; 5 mm through the bearings | EMAX spec sheet, EMAX USA product page |
| Mounting | 4 × M3 holes on a 19 mm circle (19 × 19 mm) | EMAX spec sheet |
| Magnets | N52SH arc magnets | EMAX USA product page |
| Bearings | G1 bearings (EMAX’s E3 infographic; it gives no size) | EMAX USA product page |
| Winding | Single-strand | EMAX USA product page |
| Internal resistance | 60 mΩ (1500KV 50 mΩ, 1700KV 40 mΩ) | EMAX spec sheet |
| Idle current | 1.4 A (at 10 V; 1500KV 1.8 A, 1700KV 2.1 A) | EMAX spec sheet |
| Peak current | 55 A (on 6S; 1500KV 63 A on 6S, 1700KV 54 A on 4S) | EMAX spec sheet |
| Max power | 1,390 W (on 6S; 1500KV 1590 W on 6S, 1700KV 907 W on 4S) | EMAX spec sheet |
| Leads | 18 AWG, 200 mm | EMAX spec sheet |
Bench data
Redrawn from EMAX’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.
1300KV on 6S, 25.2 V1 prop
| Prop | Step | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| EMAX Avia 7035 (3-blade) | 2.06 | 300 | 51.91 | 5.78 | |
| 3.91 | 500 | 98.53 | 5.07 | ||
| 6.46 | 730 | 162.79 | 4.48 | ||
| 9.92 | 1,050 | 249.98 | 4.2 | ||
| 14.2 | 1,320 | 357.84 | 3.69 | ||
| 19.1 | 1,610 | 481.32 | 3.34 | ||
| 25.2 | 1,950 | 635.04 | 3.07 | ||
| Max | 32.4 | 2,290 | 816.48 | 2.8 |
Source: EMAX thrust tables
1500KV on 6S, 25.2 V1 prop
| Prop | Step | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| EMAX Avia 7040 (3-blade) | 2.66 | 340 | 67.03 | 5.07 | |
| 5.2 | 590 | 131.04 | 4.5 | ||
| 8.75 | 870 | 220.5 | 3.95 | ||
| 13.7 | 1,230 | 345.24 | 3.56 | ||
| 20.2 | 1,595 | 509.04 | 3.13 | ||
| 28.5 | 1,990 | 718.2 | 2.77 | ||
| 38.1 | 2,270 | 960.12 | 2.36 | ||
| Max | 51.3 | 2,580 | 1292.76 | 2 |
Source: EMAX thrust tables
1700KV on 4S, 16.8 V1 prop
| Prop | Step | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| EMAX Avia 7035 (3-blade) | 2.2 | 225 | 36.96 | 6.09 | |
| 4.23 | 380 | 71.06 | 5.35 | ||
| 6.84 | 560 | 114.91 | 4.87 | ||
| 10.2 | 750 | 171.36 | 4.38 | ||
| 14.6 | 980 | 245.28 | 4 | ||
| 20.1 | 1,230 | 337.68 | 3.64 | ||
| 26.2 | 1,480 | 440.16 | 3.36 | ||
| Max | 33.4 | 1,760 | 561.12 | 3.14 |
Source: EMAX thrust tables
Inside the motor
A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:
- Shaft. Hardened steel, M5 thread, protrudes 14 mm; 5 mm through the bearings. (EMAX spec sheet, EMAX USA product page)
- Magnets. N52SH arc magnets. (EMAX USA product page)
- Stator. The coils are wound on a stack of thin steel laminations: 28 × 7 mm (2807). (EMAX USA product page)
- Winding. Single-strand. (EMAX USA product page)
- Bearings. G1 bearings (EMAX’s E3 infographic; it gives no size). (EMAX USA product page)
- Base. 4 × M3 holes on a 19 mm circle (19 × 19 mm). (EMAX spec sheet)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 1300KV 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 | 19,240 | 2,245 Hz | 13,468 |
| 4S full | 16.8 | 21,840 | 2,548 Hz | 15,288 |
| 6S nominal | 22.2 | 28,860 | 3,367 Hz | 20,202 |
| 6S full | 25.2 | 32,760 | 3,822 Hz | 22,932 |
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 EMAX’s published sizes: the 28 × 7 mm stator, 34.8 mm bell, 20.9 mm height, 5 mm shaft, 19 mm mounting circle and 12 teeth and 14 magnets. Anything EMAX 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
- EMAX USA: E3 Series 2807 Brushless Motor (product page, with its spec table and EMAX’s E3 infographics). Retrieved Oct 19, 2026.
- EMAX: ECOIII series 2807 1300KV 1500KV 1700KV (product page on EMAX’s global store). Retrieved Oct 19, 2026.
- EMAX: ECOIII-2807 spec sheet (dimension drawing and spec table for each KV; image on EMAX’s product page). Retrieved Oct 19, 2026.
- EMAX: ECOIII-2807 thrust tables, 1300KV and 1500KV at 25.2 V, 1700KV at 16.8 V (image on EMAX’s product page). Steps of thrust, then “Max” at full throttle; EMAX’s rpm column is left out because it has no figure at full throttle.. Retrieved Oct 19, 2026.
