5-inch FPV freestyle motor
EMAX E3 2306
A 5-inch racing and freestyle motor: 2306 stator, single-strand windings, N52SH magnets, 29.4 g without leads, and up to 1,760 g of pull per motor on EMAX’s 6S bench (1900KV).
- 5-inch freestyle and racing
- 6S (1700KV, 1900KV) or 4S (2400KV)
- 5 to 5.5-inch props
The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 2306 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
- 1,760 g
- EMAX AVAN 5026 prop, 25.2 V
- Weight
- 29.4 g
- without leads; 1700KV 29.4 g, 2400KV 29.5 g
- Peak current
- 38.8 A
- full throttle
- Max power
- 978 W
- full throttle
from $14.99a motor at EMAX USA
A set of four: $59.96
Price seen Oct 19, 2026. Plain links: we earn nothing from them.
What you get for $14.99
1.76 kg of pull on 6S
On EMAX’s 25.2 V bench the 1900KV pulled 1,760 g at full throttle on an EMAX AVAN 5026, drawing 38.8 A.
Source: EMAX thrust tables
4.46 g/W at 200 g
Making 200 g of thrust on 6S, the 1700KV ran at 4.46 g/W on the AVAN 5026.
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, G1 bearings 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 36 A (1700KV) and 46 A (1900KV) on 6S, and 43 A (2400KV) on 4S. On its bench the 1900KV drew 38.8 A at full throttle. A 50 A ESC covers all three. (EMAX spec sheet, EMAX thrust tables)
- Props
- EMAX lists 5 to 5.5-inch props (5-inch for the 1900KV) and tested its own AVAN 5026 three-blade: 1,570 g (1700KV) and 1,760 g (1900KV) at full throttle on 6S, 1,250 g (2400KV) on 4S. (EMAX spec sheet, EMAX thrust tables)
- Battery
- 6S for the 1700KV and 1900KV, which EMAX rates for 3S–6S and tested at 25.2 V; 4S for the 2400KV, rated for 3S–4S and tested at 16.8 V. (EMAX spec sheet, EMAX thrust tables)
- Frame
- Four M3 holes on a 16 mm circle (16 × 16 mm). (EMAX spec sheet)
Where to buy
- EMAX USAthe maker’s US store; same price for every KV$14.99seen Oct 19, 2026Visit
- EMAX USA2100KV, Rainbow Limited Edition$15.99seen Oct 19, 2026Visit
- EMAXthe maker’s global store, as the ECOIII 2306$23.08seen Oct 19, 2026Visit
- Pyrodronechoose the KVprice on the store’s pageVisit
Plain links, not affiliate links. Prices change; the store’s page has the current one.
Full specs
| Spec | Value | Source |
|---|---|---|
| KV | 1,900 rpm/V (also 1700KV and 2400KV, and 2100KV as a Rainbow Limited Edition) | EMAX USA product page |
| Stator | 23 × 6 mm (2306) | EMAX USA product page, EMAX spec sheet |
| Configuration | 12N14P (12 stator slots, 14 magnet poles) | EMAX spec sheet |
| Battery | 3S–6S LiPo (1700KV, 1900KV); 3S–4S (2400KV) (EMAX’s E3 infographic says the 2306 supports up to 8S; the spec sheet rates the KVs it lists as given here) | EMAX spec sheet |
| Weight | 29.4 g (without leads; 1700KV 29.4 g, 2400KV 29.5 g) | EMAX spec sheet |
| Dimensions | φ28.9 × 31.8 mm (with shaft); 25 mm from the bottom of the bell to the shaft tip | EMAX spec sheet |
| Shaft | Hardened steel, M5 thread, protrudes 12.9 mm; 4 mm through the bearings | EMAX spec sheet, EMAX USA product page |
| Mounting | 4 × M3 holes on a 16 mm circle (16 × 16 mm) | EMAX spec sheet |
| Bell | 7075 aluminium | EMAX USA product page |
| 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 | 66 mΩ (1700KV 79 mΩ, 2400KV 47 mΩ) | EMAX spec sheet |
| Idle current | 1.3 A (at 10 V; 1700KV 1.1 A, 2400KV 1.7 A) | EMAX spec sheet |
| Peak current | 46 A (on 6S; 1700KV 36 A on 6S, 2400KV 43 A on 4S) | EMAX spec sheet |
| Max power | 1,160 W (on 6S; 1700KV 970 W on 6S, 2400KV 720 W on 4S) | EMAX spec sheet |
| Leads | 20 AWG, 120 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.
1700KV on 6S, 25.2 V1 prop
| Prop | Step | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| EMAX AVAN 5026 (3-blade) | 1.78 | 200 | 44.86 | 4.46 | |
| 3.51 | 350 | 88.45 | 3.96 | ||
| 5.9 | 520 | 148.68 | 3.5 | ||
| 9.23 | 700 | 232.6 | 3.01 | ||
| 13.2 | 920 | 332.64 | 2.77 | ||
| 18.3 | 1,150 | 461.16 | 2.49 | ||
| 23.7 | 1,320 | 597.24 | 2.21 | ||
| Max | 30.5 | 1,570 | 768.6 | 2.04 |
Source: EMAX thrust tables
1900KV on 6S, 25.2 V1 prop
| Prop | Step | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| EMAX AVAN 5026 (3-blade) | 2.32 | 250 | 58.46 | 4.28 | |
| 4.54 | 420 | 114.41 | 3.67 | ||
| 7.76 | 610 | 195.55 | 3.12 | ||
| 11.6 | 830 | 292.32 | 2.84 | ||
| 16.9 | 1,050 | 425.88 | 2.47 | ||
| 23.3 | 1,260 | 587.16 | 2.15 | ||
| 29.7 | 1,500 | 748.44 | 2 | ||
| Max | 38.8 | 1,760 | 977.76 | 1.8 |
Source: EMAX thrust tables
2400KV on 4S, 16.8 V1 prop
| Prop | Step | Current (A) | Thrust (g) | Power (W) | Efficiency (g/W) |
|---|---|---|---|---|---|
| EMAX AVAN 5026 (3-blade) | 2.06 | 165 | 34.61 | 4.77 | |
| 4.07 | 286 | 68.38 | 4.18 | ||
| 6.62 | 410 | 111.22 | 3.69 | ||
| 10.2 | 570 | 171.36 | 3.33 | ||
| 14.6 | 734 | 245.28 | 2.99 | ||
| 19.9 | 900 | 334.32 | 2.69 | ||
| 26.3 | 1,060 | 441.84 | 2.4 | ||
| Max | 33.4 | 1,250 | 561.12 | 2.23 |
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 12.9 mm; 4 mm through the bearings. (EMAX spec sheet, EMAX USA product page)
- Bell. 7075 aluminium. (EMAX USA product page)
- Magnets. N52SH arc magnets. (EMAX USA product page)
- Stator. The coils are wound on a stack of thin steel laminations: 23 × 6 mm (2306). (EMAX USA product page, EMAX spec sheet)
- 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 16 mm circle (16 × 16 mm). (EMAX spec sheet)
How fast it spins
KV is the motor’s no-load speed per volt. With nothing on the shaft, the 1900KV 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 | 28,120 | 3,281 Hz | 19,684 |
| 4S full | 16.8 | 31,920 | 3,724 Hz | 22,344 |
| 6S nominal | 22.2 | 42,180 | 4,921 Hz | 29,526 |
| 6S full | 25.2 | 47,880 | 5,586 Hz | 33,516 |
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 23 × 6 mm stator, 28.9 mm bell, 18.9 mm height, 5 mm shaft, 16 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 2306 Brushless Motor (product page, with its spec table and EMAX’s E3 infographics). Retrieved Oct 19, 2026.
- EMAX: ECOIII series 2306 1700KV 1900KV 2400KV (product page on EMAX’s global store). Retrieved Oct 19, 2026.
- EMAX: ECOIII-2306 spec sheet (dimension drawing and spec table for each KV; image on EMAX’s product page). Retrieved Oct 19, 2026.
- EMAX: ECOIII-2306 thrust tables, 1700KV and 1900KV at 25.2 V, 2400KV at 16.8 V, on EMAX’s AVAN 5026 three-blade (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.
- EMAX USA: E3 Series 2306 2100kv Rainbow Limited Edition Brushless Motor (product page). Retrieved Oct 19, 2026.
