EMAX RSIII Series 2207

Stator	2207
KV options	1800, 2100, 2500
Weight	29.3 g (1800KV, cable excluded)
Max cells	3-6S (1800/2100KV) / 3-4S (2500KV)
Configuration	12N14P
Dimensions	26.9x33 mm
Mount (bolt circle, mm)	Ø16 (4-M3)
Winding resistance	72 (1800KV) / 54 (2100KV) / 42 (2500KV) mOhm
Max thrust	2220 g
Price (approx.)	23.99 USD

At 29.3 g it is 3.9 g lighter than average across the 39 2207-class motors in our database (avg 33.2 g).

Best props for the RSIII Series 2207

5"-5.5"

Thrust data (EMAX bench test)

KV	Prop	Battery	Throttle	Current	RPM	Thrust	Efficiency
1800	DALPROP Cyclone 5040	6S	—	2.9 A	15600	300 g	4.11 g/W
1800	DALPROP Cyclone 5040	6S	—	5.7 A	19800	500 g	3.48 g/W
1800	DALPROP Cyclone 5040	6S	—	8.9 A	23100	700 g	3.12 g/W
1800	DALPROP Cyclone 5040	6S	100%	28.3 A	—	1630 g	2.29 g/W
1800	DALPROP Cyclone 5050	6S	—	2.9 A	12800	300 g	4.11 g/W
1800	DALPROP Cyclone 5050	6S	—	5.8 A	16300	500 g	3.42 g/W
1800	DALPROP Cyclone 5050	6S	—	9.4 A	19100	700 g	2.96 g/W
1800	DALPROP Cyclone 5050	6S	100%	42.6 A	—	1930 g	1.8 g/W
1800	DALPROP Cyclone 5046	6S	—	2.9 A	13600	300 g	4.11 g/W
1800	DALPROP Cyclone 5046	6S	—	5.8 A	17400	500 g	3.42 g/W
1800	DALPROP Cyclone 5046	6S	—	9.3 A	20100	700 g	2.99 g/W
1800	DALPROP Cyclone 5046	6S	100%	38.1 A	—	1920 g	2.0 g/W
1800	HQ 5x4.3x3	6S	—	2.9 A	14500	300 g	4.11 g/W
1800	HQ 5x4.3x3	6S	—	5.5 A	18400	500 g	3.61 g/W
1800	HQ 5x4.3x3	6S	—	8.8 A	21800	700 g	3.16 g/W
1800	HQ 5x4.3x3	6S	100%	30.1 A	—	1730 g	2.28 g/W
1800	HQ 5x4.8x3	6S	—	2.9 A	13500	300 g	4.11 g/W
1800	HQ 5x4.8x3	6S	—	5.6 A	17900	500 g	3.54 g/W
1800	HQ 5x4.8x3	6S	—	9.0 A	20300	700 g	3.09 g/W
1800	HQ 5x4.8x3	6S	100%	35.3 A	—	1920 g	2.16 g/W
1800	Gemfan 5045-3	6S	—	2.9 A	15300	300 g	4.11 g/W
1800	Gemfan 5045-3	6S	—	5.6 A	19300	500 g	3.54 g/W
1800	Gemfan 5045-3	6S	—	8.9 A	22500	700 g	3.12 g/W
1800	Gemfan 5045-3	6S	100%	31.0 A	—	1720 g	2.2 g/W
2100	DALPROP Cyclone 5040	6S	—	3.0 A	13700	300 g	3.97 g/W
2100	DALPROP Cyclone 5040	6S	—	5.8 A	19400	500 g	3.42 g/W
2100	DALPROP Cyclone 5040	6S	—	9.3 A	22700	700 g	2.99 g/W
2100	DALPROP Cyclone 5040	6S	100%	40.2 A	—	1980 g	1.95 g/W
2100	DALPROP Cyclone 5046	6S	—	3.0 A	13400	300 g	3.97 g/W
2100	DALPROP Cyclone 5046	6S	—	6.1 A	17100	500 g	3.25 g/W
2100	DALPROP Cyclone 5046	6S	—	9.9 A	20300	700 g	2.81 g/W
2100	DALPROP Cyclone 5046	6S	100%	50.3 A	—	2210 g	1.74 g/W
2100	HQ 5x4.3x3	6S	—	3.1 A	14500	300 g	3.84 g/W
2100	HQ 5x4.3x3	6S	—	5.9 A	18400	500 g	3.36 g/W
2100	HQ 5x4.3x3	6S	—	9.4 A	21800	700 g	2.96 g/W
2100	HQ 5x4.3x3	6S	100%	41.2 A	—	2030 g	1.96 g/W
2100	HQ 5x4.8x3	6S	—	3.1 A	13300	300 g	3.84 g/W
2100	HQ 5x4.8x3	6S	—	6.1 A	17100	500 g	3.25 g/W
2100	HQ 5x4.8x3	6S	—	9.6 A	20100	700 g	2.89 g/W
2100	HQ 5x4.8x3	6S	100%	47.9 A	—	2220 g	1.84 g/W
2100	Gemfan 5045-3	6S	—	3.0 A	15000	300 g	3.97 g/W
2100	Gemfan 5045-3	6S	—	6.1 A	19300	500 g	3.25 g/W
2100	Gemfan 5045-3	6S	—	9.6 A	22000	700 g	2.89 g/W
2100	Gemfan 5045-3	6S	100%	42.8 A	—	2030 g	1.88 g/W
2500	DALPROP Cyclone 5040	4S	—	4.8 A	15500	300 g	3.72 g/W
2500	DALPROP Cyclone 5040	4S	—	9.1 A	18400	500 g	3.27 g/W
2500	DALPROP Cyclone 5040	4S	—	13.9 A	22900	700 g	3.0 g/W
2500	DALPROP Cyclone 5040	4S	100%	36.5 A	—	1480 g	2.41 g/W
2500	DALPROP Cyclone 5046	4S	—	4.6 A	13800	300 g	3.88 g/W
2500	DALPROP Cyclone 5046	4S	—	9.0 A	17000	500 g	3.31 g/W
2500	DALPROP Cyclone 5046	4S	—	14.1 A	20200	700 g	2.96 g/W
2500	DALPROP Cyclone 5046	4S	100%	44.9 A	—	1630 g	2.16 g/W
2500	HQ 5x4.3x3	4S	—	4.6 A	14400	300 g	3.88 g/W
2500	HQ 5x4.3x3	4S	—	8.8 A	18400	500 g	3.38 g/W
2500	HQ 5x4.3x3	4S	—	13.8 A	21700	700 g	3.02 g/W
2500	HQ 5x4.3x3	4S	100%	37.3 A	—	1490 g	2.38 g/W
2500	HQ 5x4.8x3	4S	—	4.6 A	13300	300 g	3.88 g/W
2500	HQ 5x4.8x3	4S	—	8.9 A	17400	500 g	3.34 g/W
2500	HQ 5x4.8x3	4S	—	14.6 A	20300	700 g	2.85 g/W
2500	HQ 5x4.8x3	4S	100%	43.1 A	—	1630 g	2.25 g/W
2500	Gemfan 5045-3	4S	—	4.6 A	15400	300 g	3.88 g/W
2500	Gemfan 5045-3	4S	—	9.1 A	19500	500 g	3.27 g/W
2500	Gemfan 5045-3	4S	—	14.1 A	22800	700 g	2.96 g/W
2500	Gemfan 5045-3	4S	100%	37.3 A	—	1460 g	2.33 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 2207 vs other 2207 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.

Motor	KV	Prop	Peak thrust	At 875 g	At 1750 g
EMAX RSIII Series 2207	2100	HQ 5x4.8x3	2220 g at 1207 W	353 W (2.48 g/W)	909 W (1.93 g/W)
Axisflying AE2207 V2 2207	2100	51466	1798 g at 1091 W	298 W (2.93 g/W)	1028 W (1.7 g/W)
VCI HOBBY VCI Spark 2207 Pro	2100	GF F3-3B	1970 g at 1088 W	352 W (2.49 g/W)	930 W (1.88 g/W)
Axisflying Blackbird V3 2207	2125	GF 51466	1951 g at 1289 W	380 W (2.3 g/W)	1050 W (1.67 g/W)
RUSHFPV Reactor Racing 2207.5	2060	GF 51433	2050 g at 1238 W	288 W (3.04 g/W)	878 W (1.99 g/W)
RUSHFPV Reactor Training 2207	2060	GF 51433	2050 g at 1238 W	288 W (3.04 g/W)	878 W (1.99 g/W)

Power at 875 g and 1750 g is read off each maker's curve, straight-line between its two nearest bench points; 1750 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 2207 motor: 2207 motors compared. How to read a bench table: reading motor bench tables.

Thrust-to-weight with this motor

Four EMAX RSIII Series 2207 motors at 2220 g max thrust each give 8880 g: 2:1, the minimum to fly, up to 4440 g all-up; 4:1 (freestyle) up to 2220 g; 8:1 (racing) up to 1110 g.

RPM & prop speed on this motor

Props in this motor's class

Prop	Size	Blades	Weight
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 (RSIII2207.png) on the maker's product page, read at full size 2026-10-20: one block per winding, each 12N14P, Φ26.9*33mm, 4 mm bearing shaft, 20#AWG 120 mm lead, internal resistance 72 / 54 / 42 mΩ (1800/2100/2500 KV), weight 29.3 g at 1800 KV, 29.4 g at 2100 and 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' 29.3 / 29.4 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.