EMAX RSIII Series 2306

EMAX RSIII Series 2306
Image: racedayquads.com
Stator2306
KV options1800, 2100, 2500
Weight27.9 g (1800KV, cable excluded)
Max cells3-6S (1800/2100KV) / 3-4S (2500KV)
Configuration12N14P
Dimensions27.3x32 mm
Mount (bolt circle, mm)Ø16 (4-M3)
Winding resistance68 (1800KV) / 57 (2100KV) / 43 (2500KV) mOhm
Max thrust1980 g
Price (approx.)23.99 USD

At 27.9 g it is 4.8 g lighter than average across the 21 2306-class motors in our database (avg 32.7 g).

Best props for the RSIII Series 2306

5"-5.5"

Thrust data (EMAX bench test)

KVPropBatteryThrottleCurrentRPMThrustEfficiency
1800 DALPROP Cyclone 5040-3 6S — 2.9 A 15200 300 g 4.11 g/W
1800 DALPROP Cyclone 5040-3 6S — 5.6 A 19300 500 g 3.54 g/W
1800 DALPROP Cyclone 5040-3 6S — 9.0 A 22800 700 g 3.09 g/W
1800 DALPROP Cyclone 5040-3 6S 100% 27.9 A — 1680 g 2.39 g/W
1800 DALPROP Cyclone 5050-3 6S — 2.9 A 12600 300 g 4.11 g/W
1800 DALPROP Cyclone 5050-3 6S — 5.8 A 16500 500 g 3.42 g/W
1800 DALPROP Cyclone 5050-3 6S — 9.8 A 18900 700 g 2.83 g/W
1800 DALPROP Cyclone 5050-3 6S 100% 33.5 A — 1730 g 2.05 g/W
1800 DALPROP Cyclone 5046-3 6S — 3.0 A 13800 300 g 3.97 g/W
1800 DALPROP Cyclone 5046-3 6S — 5.8 A 17500 500 g 3.42 g/W
1800 DALPROP Cyclone 5046-3 6S — 9.6 A 20700 700 g 2.89 g/W
1800 DALPROP Cyclone 5046-3 6S 100% 32.5 A — 1700 g 2.08 g/W
1800 HQ 5x4.3x3 6S — 2.8 A 14300 300 g 4.25 g/W
1800 HQ 5x4.3x3 6S — 5.5 A 18500 500 g 3.61 g/W
1800 HQ 5x4.3x3 6S — 8.9 A 21800 700 g 3.12 g/W
1800 HQ 5x4.3x3 6S 100% 29.8 A — 1720 g 2.29 g/W
1800 HQ 5x4.8x3 6S — 2.8 A 13200 300 g 4.25 g/W
1800 HQ 5x4.8x3 6S — 5.6 A 17200 500 g 3.54 g/W
1800 HQ 5x4.8x3 6S — 9.2 A 20200 700 g 3.02 g/W
1800 HQ 5x4.8x3 6S 100% 34.1 A — 1780 g 2.07 g/W
1800 Gemfan 5045-3 6S — 2.8 A 15300 300 g 4.25 g/W
1800 Gemfan 5045-3 6S — 5.6 A 19300 500 g 3.54 g/W
1800 Gemfan 5045-3 6S — 9.0 A 22800 700 g 3.09 g/W
1800 Gemfan 5045-3 6S 100% 30.6 A — 1670 g 2.17 g/W
2100 DALPROP Cyclone 5040-3 6S — 3.1 A 15400 300 g 3.84 g/W
2100 DALPROP Cyclone 5040-3 6S — 5.9 A 19100 500 g 3.36 g/W
2100 DALPROP Cyclone 5040-3 6S — 9.7 A 22800 700 g 2.86 g/W
2100 DALPROP Cyclone 5040-3 6S 100% 36.1 A — 1820 g 2.0 g/W
2100 DALPROP Cyclone 5050-3 6S — 3.1 A 12800 300 g 3.84 g/W
2100 DALPROP Cyclone 5050-3 6S — 6.2 A 16300 500 g 3.2 g/W
2100 DALPROP Cyclone 5050-3 6S — 10.1 A 19100 700 g 2.75 g/W
2100 DALPROP Cyclone 5050-3 6S 100% 46.5 A — 1920 g 1.64 g/W
2100 DALPROP Cyclone 5046-3 6S — 3.0 A 13600 300 g 3.97 g/W
2100 DALPROP Cyclone 5046-3 6S — 5.9 A 17200 500 g 3.36 g/W
2100 DALPROP Cyclone 5046-3 6S — 9.9 A 20300 700 g 2.81 g/W
2100 DALPROP Cyclone 5046-3 6S 100% 46.2 A — 1960 g 1.68 g/W
2100 HQ 5x4.8x3 6S — 2.9 A 13300 300 g 4.11 g/W
2100 HQ 5x4.8x3 6S — 5.9 A 17000 500 g 3.36 g/W
2100 HQ 5x4.8x3 6S — 9.7 A 20100 700 g 2.86 g/W
2100 HQ 5x4.8x3 6S 100% 41.8 A — 1980 g 1.88 g/W
2100 Gemfan 5045-3 6S — 3.0 A 15100 300 g 3.97 g/W
2100 Gemfan 5045-3 6S — 5.9 A 19300 500 g 3.36 g/W
2100 Gemfan 5045-3 6S — 9.6 A 22500 700 g 2.89 g/W
2100 Gemfan 5045-3 6S 100% 37.7 A — 1830 g 1.93 g/W
2500 DALPROP Cyclone 5040-3 4S — 4.4 A 15300 300 g 4.06 g/W
2500 DALPROP Cyclone 5040-3 4S — 8.7 A 19300 500 g 3.42 g/W
2500 DALPROP Cyclone 5040-3 4S — 13.6 A 22800 700 g 3.06 g/W
2500 DALPROP Cyclone 5040-3 4S 100% 35.1 A — 1410 g 2.39 g/W
2500 DALPROP Cyclone 5050-3 4S — 4.5 A 12900 300 g 3.97 g/W
2500 DALPROP Cyclone 5050-3 4S — 9.2 A 16500 500 g 3.23 g/W
2500 DALPROP Cyclone 5050-3 4S — 15.2 A 19400 700 g 2.74 g/W
2500 DALPROP Cyclone 5050-3 4S 100% 47.9 A — 1590 g 1.98 g/W
2500 DALPROP Cyclone 5046-3 4S — 4.5 A 13600 300 g 3.97 g/W
2500 DALPROP Cyclone 5046-3 4S — 8.9 A 17500 500 g 3.34 g/W
2500 DALPROP Cyclone 5046-3 4S — 14.3 A 20300 700 g 2.91 g/W
2500 DALPROP Cyclone 5046-3 4S 100% 43.1 A — 1580 g 2.18 g/W
2500 HQ 5x4.3x3 4S — 4.3 A 14500 300 g 4.15 g/W
2500 HQ 5x4.3x3 4S — 8.5 A 18400 500 g 3.5 g/W
2500 HQ 5x4.3x3 4S — 13.4 A 21800 700 g 3.11 g/W
2500 HQ 5x4.3x3 4S 100% 36.5 A — 1480 g 2.41 g/W
2500 HQ 5x4.8x3 4S — 4.4 A 13300 300 g 4.06 g/W
2500 HQ 5x4.8x3 4S — 8.7 A 17000 500 g 3.42 g/W
2500 HQ 5x4.8x3 4S — 13.9 A 20200 700 g 3.0 g/W
2500 HQ 5x4.8x3 4S 100% 41.9 A — 1580 g 2.24 g/W
2500 Gemfan 5045-3 4S — 4.3 A 15300 300 g 4.15 g/W
2500 Gemfan 5045-3 4S — 8.7 A 19300 500 g 3.42 g/W
2500 Gemfan 5045-3 4S — 13.7 A 22700 700 g 3.04 g/W
2500 Gemfan 5045-3 4S 100% 36.8 A — 1470 g 2.38 g/W

Manufacturer bench figures (6S, HQ 5x4.8x3, 100% throttle, 2100KV; manufacturer payload test at fixed thrust points (300/500/700 g) plus max; 2500KV tested on 4S); real-world thrust varies with ESC, battery sag and prop condition.

RSIII Series 2306 vs other 2306 motors on 6S

The same thrust costs different power on different motors. Each line is one maker's own bench series (6S, its own prop), drawn as grams of thrust per watt against thrust, so a higher line makes that thrust for less battery current. Throttle percent is left out on purpose: it means something different on every maker's rig.

012340500100015002000 thrust, g g/W
MotorKVPropPeak thrust At 825 gAt 1650 g
EMAX RSIII Series 2306 2100 HQ 5x4.8x3 1980 g at 1053 W 323 W (2.55 g/W) 845 W (1.95 g/W)
T-Motor F40 Pro V 2306.8 2150 T-Motor T5147-3 2108 g at 1588 W 350 W (2.35 g/W) 968 W (1.7 g/W)
Axisflying AE V2 2306.5 1960 51466 1760 g at 1042 W 322 W (2.57 g/W) 880 W (1.87 g/W)
T-Motor F40 PRO IV 2306.5 1950 T-Motor T5150 Tri-Blade 1902 g at 1012 W 267 W (3.09 g/W) 850 W (1.94 g/W)
T-Motor Pacer V2 P2306 1950 T-Motor T5147 Tri-Blade 1701 g at 950 W 289 W (2.86 g/W) 870 W (1.9 g/W)
T-Motor VELOX V2 2306 1950 T-Motor T5150 1656 g at 850 W 307 W (2.68 g/W) 847 W (1.95 g/W)

Power at 825 g and 1650 g is read off each maker's curve, straight-line between its two nearest bench points; 1650 g is the highest thrust every motor here reached. Different props and rigs move these curves as much as the motor does, so compare rows on a similar prop. Peak thrust of every 2306 motor: 2306 motors compared. How to read a bench table: reading motor bench tables.

Thrust-to-weight with this motor

Four EMAX RSIII Series 2306 motors at 1980 g max thrust each give 7920 g: 2:1, the minimum to fly, up to 3960 g all-up; 4:1 (freestyle) up to 1980 g; 8:1 (racing) up to 990 g.

RPM & prop speed on this motor

Props in this motor's class

PropSizeBladesWeight
Gemfan Long Range 5126-2 Durable 1.5mm T-Mount 5.1x2.7 2 2.6 g
HQProp DP 5.1x2.5x3 5.1x2.5 3 3.1 g
HQProp Juicy J40 5.1x4.0 3 3.4 g
HQProp 5.2x3.2x3 5.2x3.2 3 3.5 g
HQProp ETHIX P3.3 5.1x3.3x3 5.1x3.3 3 3.5 g

Where this data comes from

Weight, body, winding and resistance from EMAX's own Specifications sheet (RSIII2306.png) on the maker's product page, read at full size 2026-10-20: one block per winding, each 12N14P, Φ27.3*32mm, 4 mm bearing shaft, 20#AWG 120 mm lead, internal resistance 68 / 57 / 43 mΩ (1800/2100/2500 KV), weight 27.9 g at 1800 KV, 27.8 g at 2100 KV, 27.7 g at 2500 KV, every one printed "(W/O Silicone Wire)", and the page's infographic repeats the 1800 KV figure "without wires". EMAX prints no weight with the cable, so weight_g keeps the maker's first-listed winding's figure, named on the page as cable excluded, rather than a with-cable figure nobody publishes; the retail listings' 27.9 / 27.8 / 27.7 g split is the three windings, not a disagreement. The drawing gives a Φ16 4-M3 bolt circle (mount_bolt_circle_mm) and an M5 prop thread.

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