2–3-inch toothpick FPV motor

EMAX RS1108

An 8.2 g micro racing motor for 2 to 3-inch props: 11 × 8 mm stator, 9N12P, single-strand windings, 2S–4S, and up to 436 g of pull on EMAX’s 16 V bench (5200KV, GF3020).

2 to 3-inch micro racing
4S (4500KV, 5200KV) or 2S (6000KV)

Drawing the 3D model…

Throttle60%

The spin is an illustration: the model turns at 1/600 of the no-load speed, and it is a generic 1108 motor drawn from EMAX’s published sizes, not its exact design. No-load speed is KV × 14.8 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.

Version

4500KV2S–4S5200KV2S–4S6000KV2S–4S

EMAX tested it at 16 V and 12 V on 2 to 3-inch props.

Max thrust: 436 g; GF3020 prop, 16 V
Weight: 8.2 g; without leads; the leads add 0.5 g
Peak current: 17.5 A; full throttle
Max power: 280 W; full throttle

Plain links: we earn nothing from them.

What you get

436 g at 16 V
At 16 V the 5200KV pulled 436 g at full throttle on a GF3020, drawing 17.5 A; the 4500KV pulled 432 g on a GF3025 at 13.4 A.
Source: EMAX 5200KV test report, EMAX 4500KV test report
A longer RS1106
EMAX built the RS1108 as a step up from the RS1106 on its Babyhawk R quads, for its AVAN 2 to 3-inch props.
Source: EMAX USA product page (5200KV), EMAX product page
4.1 g/W on 2S
At 8 V on an AVAN Mini the 6000KV made 33 g at 1 A (4.13 g/W) and 266 g at full throttle, EMAX’s quoted maximum on 2S.
Source: EMAX 6000KV test report, EMAX USA product page (5200KV)

What to pair it with

Our reading of EMAX’s numbers, so your build matches what the motor was tested with.

ESC: On EMAX’s bench the motors drew up to 17.5 A at 16 V (5200KV, GF3020), 13.7 A at 12 V and 14.9 A at 8 V; a 20 A ESC covers all three KVs. (EMAX 4500KV test report, EMAX 5200KV test report, EMAX 6000KV test report)
Props: 2 to 3-inch props, per EMAX; it tested them on Gemfan, RotorX and HGLRC props and on its own AVAN Mini and T2345. (EMAX USA product page (5200KV), EMAX 4500KV test report, EMAX 5200KV test report, EMAX 6000KV test report)
Battery: 2S–4S per EMAX USA (its global page says 2S); EMAX tested the 4500KV and 5200KV at 12 and 16 V and the 6000KV at 8 V. (EMAX USA product page (5200KV), EMAX product page, EMAX 4500KV test report, EMAX 5200KV test report, EMAX 6000KV test report)

Where to buy

EMAX USAthe maker’s US store; 5200KV (listed as sold out)
$10.99seen Oct 19, 2026
Visit
EMAX USAthe maker’s US store; 4500KV (listed as sold out)
$10.99seen Oct 19, 2026
Visit
EMAX USAthe maker’s US store; 6000KV (listed as sold out)
$10.99seen Oct 19, 2026
Visit
EMAXthe maker’s global store; all three KVs (all listed as sold out)
$10.78seen Oct 19, 2026
Visit

Plain links, not affiliate links. Prices change; the store’s page has the current one.

Full specs

Spec	Value	Source
KV	5,200 rpm/V (also 4500KV and 6000KV)	EMAX USA product page (5200KV), EMAX product page
Stator	11 × 8 mm (1108)	EMAX USA product page (5200KV), EMAX product page
Configuration	9N12P (9 stator slots, 12 magnet poles)	EMAX USA product page (5200KV), EMAX product page
Battery	2S–4S LiPo (EMAX’s global page says 2S; EMAX tested the 4500KV and 5200KV at 12 and 16 V and the 6000KV at 8 V)	EMAX USA product page (5200KV), EMAX USA product page (4500KV), EMAX USA product page (6000KV)
Weight	8.2 g (without leads; the leads add 0.5 g)	EMAX USA product page (5200KV), EMAX 5200KV test report
Dimensions	φ14.2 × 20.5 mm (EMAX’s diameter and length)	EMAX USA product page (5200KV), EMAX product page
Shaft	1.5 mm	EMAX USA product page (5200KV), EMAX product page
Winding	Single-strand	EMAX 4500KV test report, EMAX 5200KV test report, EMAX 6000KV test report
Idle current	0.66 A (at 8 V, turning 42,700 rpm unloaded; 4500KV 0.6 A at 8 V (37,500 rpm), 6000KV 0.68 A at 7 V (43,000 rpm))	EMAX 5200KV test report
Leads	28 AWG silicone wire, 70 mm	EMAX 4500KV test report, EMAX 5200KV test report, EMAX 6000KV test report

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.

4500KV on 2S–4S9 props

Prop	Step	Current (A)	Thrust (g)	Power (W)	Efficiency (g/W)
GF3025at 16 V		1	45	16	2.81
		2	86	32	2.69
		3	125	48	2.6
		4	169	64	2.64
		5	205	80	2.56
		6	235	96	2.45
		7	265	112	2.37
		8	297	128	2.32
		9	330	144	2.29
		10	350	160	2.19
		11	367	176	2.09
		12	395	192	2.06
	Max	13.4	432	214.4	2.01
GF3020at 16 V		1	44	16	2.75
		2	83	32	2.59
		3	126	48	2.63
		4	168	64	2.63
		5	195	80	2.44
		6	226	96	2.35
		7	250	112	2.23
		8	272	128	2.13
		9	295	144	2.05
		10	330	160	2.06
		11	366	176	2.08
		12	386	192	2.01
	Max	13.6	430	217.6	1.98
RotorX RX3025at 16 V		1	41	16	2.56
		2	80	32	2.5
		3	128	48	2.67
		4	163	64	2.55
		5	202	80	2.53
		6	235	96	2.45
		7	262	112	2.34
		8	300	128	2.34
		9	336	144	2.33
		10	353	160	2.21
		11	383	176	2.18
		12	400	192	2.08
	Max	13.2	428	211.2	2.03
EMAX T2345BNat 16 V		1	39	16	2.44
		2	73	32	2.28
		3	101	48	2.1
		4	136	64	2.13
		5	160	80	2
		6	188	96	1.96
		7	210	112	1.88
		8	230	128	1.8
		9	247	144	1.72
		10	266	160	1.66
		11	290	176	1.65
		12	315	192	1.64
	Max	13	346	208	1.66
EMAX AVAN Miniat 12 V		1	46	12	3.83
		2	79	24	3.29
		3	108	36	3
		4	133	48	2.77
		5	155	60	2.58
		6	171	72	2.38
		7	190	84	2.26
		8	212	96	2.21
		9	234	108	2.17
		10	247	120	2.06
		11	258	132	1.95
		12	269	144	1.87
	Max	13.7	336	164.4	2.04
GF3025at 12 V		1	40	12	3.33
		2	80	24	3.33
		3	119	36	3.31
		4	159	48	3.31
		5	189	60	3.15
		6	213	72	2.96
		7	240	84	2.86
		8	267	96	2.78
	Max	9	303	108	2.81
GF3020at 12 V		1	40	12	3.33
		2	77	24	3.21
		3	115	36	3.19
		4	152	48	3.17
		5	184	60	3.07
		6	211	72	2.93
		7	235	84	2.8
		8	254	96	2.65
	Max	9.5	302	114	2.65
RotorX RX3025at 12 V		1	43	12	3.58
		2	83	24	3.46
		3	120	36	3.33
		4	159	48	3.31
		5	190	60	3.17
		6	218	72	3.03
		7	242	84	2.88
		8	266	96	2.77
	Max	9	299	108	2.77
EMAX T2345BNat 12 V		1	33	12	2.75
		2	62	24	2.58
		3	92	36	2.56
		4	122	48	2.54
		5	148	60	2.47
		6	171	72	2.38
		7	192	84	2.29
		8	206	96	2.15
	Max	9	237	108	2.19

Source: EMAX 4500KV test report

5200KV on 2S–4S9 props

Prop	Step	Current (A)	Thrust (g)	Power (W)	Efficiency (g/W)
GF3020at 16 V		1	45	16	2.81
		2	80	32	2.5
		3	106	48	2.21
		4	149	64	2.33
		5	182	80	2.28
		6	209	96	2.18
		7	235	112	2.1
		8	272	128	2.13
		9	292	144	2.03
		10	315	160	1.97
		11	331	176	1.88
		12	353	192	1.84
		13	369	208	1.77
		14	383	224	1.71
		15	395	240	1.65
		16	409	256	1.6
	Max	17.5	436	280	1.56
EMAX T2345BNat 16 V		1	39	16	2.44
		2	62	32	1.94
		3	87	48	1.81
		4	120	64	1.88
		5	141	80	1.76
		6	160	96	1.67
		7	182	112	1.63
		8	200	128	1.56
		9	232	144	1.61
		10	253	160	1.58
		11	271	176	1.54
		12	283	192	1.47
		13	295	208	1.42
		14	313	224	1.4
		15	338	240	1.41
		16	360	256	1.41
	Max	17	382	272	1.4
RotorX RX2535Bat 16 V		1	32	16	2
		2	56	32	1.75
		3	95	48	1.98
		4	132	64	2.06
		5	166	80	2.08
		6	183	96	1.91
		7	221	112	1.97
		8	250	128	1.95
		9	273	144	1.9
		10	292	160	1.83
		11	313	176	1.78
		12	323	192	1.68
	Max	13.5	360	216	1.67
GF3020at 12 V		1	38	12	3.17
		2	71	24	2.96
		3	104	36	2.89
		4	148	48	3.08
		5	175	60	2.92
		6	202	72	2.81
		7	225	84	2.68
		8	247	96	2.57
		9	269	108	2.49
		10	281	120	2.34
		11	294	132	2.23
	Max	12.2	358	146.4	2.45
GF3025at 12 V		1	39	12	3.25
		2	74	24	3.08
		3	108	36	3
		4	152	48	3.17
		5	181	60	3.02
		6	208	72	2.89
		7	233	84	2.77
		8	259	96	2.7
		9	282	108	2.61
		10	295	120	2.46
	Max	11.8	358	141.6	2.53
RotorX RX3025at 12 V		1	38	12	3.17
		2	71	24	2.96
		3	104	36	2.89
		4	148	48	3.08
		5	178	60	2.97
		6	203	72	2.82
		7	231	84	2.75
		8	256	96	2.67
		9	278	108	2.57
		10	294	120	2.45
	Max	11.1	351	133.2	2.64
HGLRC 2035 (5-blade)at 16 V		1	25	16	1.56
		2	49	32	1.53
		3	78	48	1.63
		4	105	64	1.64
		5	132	80	1.65
		6	160	96	1.67
		7	189	112	1.69
		8	210	128	1.64
		9	232	144	1.61
		10	253	160	1.58
		11	268	176	1.52
	Max	12	294	192	1.53
EMAX T2345BNat 12 V		1	31	12	2.58
		2	58	24	2.42
		3	82	36	2.28
		4	117	48	2.44
		5	138	60	2.3
		6	158	72	2.19
		7	182	84	2.17
		8	201	96	2.09
		9	221	108	2.05
		10	233	120	1.94
	Max	11.7	276	140.4	1.97
HGLRC 2030 (3-blade)at 16 V		1	24	16	1.5
		2	48	32	1.5
		3	84	48	1.75
		4	121	64	1.89
		5	161	80	2.01
		6	192	96	2
		7	222	112	1.98
	Max	7.9	250	126.4	1.98

Source: EMAX 5200KV test report

6000KV on 2S–4S, 8 V4 props

Prop	Step	Current (A)	Thrust (g)	Power (W)	Efficiency (g/W)
EMAX AVAN Mini		1	33	8	4.13
		2	59	16	3.69
		3	83	24	3.46
		4	102	32	3.19
		5	122	40	3.05
		6	139	48	2.9
		7	155	56	2.77
		8	167	64	2.61
		9	182	72	2.53
		10	192	80	2.4
		11	204	88	2.32
		12	215	96	2.24
		13	226	104	2.17
	Max	14.9	266	119.2	2.23
GF3025		1	30	8	3.75
		2	58	16	3.63
		3	90	24	3.75
		4	118	32	3.69
		5	148	40	3.7
		6	172	48	3.58
		7	190	56	3.39
		8	210	64	3.28
	Max	9.5	240	76	3.16
GF3020		1	28	8	3.5
		2	57	16	3.56
		3	89	24	3.71
		4	114	32	3.56
		5	143	40	3.58
		6	166	48	3.46
		7	186	56	3.32
		8	205	64	3.2
		9	217	72	3.01
	Max	9.8	237	78.4	3.02
EMAX T2345BN		1	25	8	3.13
		2	48	16	3
		3	73	24	3.04
		4	93	32	2.91
		5	112	40	2.8
		6	133	48	2.77
		7	149	56	2.66
		8	167	64	2.61
	Max	9.6	187	76.8	2.43

Source: EMAX 6000KV test report

Inside the motor

A brushless outrunner: the coils stand still in the middle and the magnets spin around them. From the top down:

Shaft. 1.5 mm. (EMAX USA product page (5200KV), EMAX product page)
Stator. The coils are wound on a stack of thin steel laminations: 11 × 8 mm (1108). (EMAX USA product page (5200KV), EMAX product page)
Winding. Single-strand. (EMAX 4500KV test report, EMAX 5200KV test report, EMAX 6000KV test report)

How fast it spins

KV is the motor’s no-load speed per volt. With nothing on the shaft, the 5200KV 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	76,960	7,696 Hz	46,176
4S full	16.8	87,360	8,736 Hz	52,416
6S nominal	22.2	115,440	11,544 Hz	69,264
6S full	25.2	131,040	13,104 Hz	78,624

A 12-pole rotor has 6 pole pairs, so every turn of the shaft is 6 electrical cycles, and a six-step ESC switches the phases 36 times per turn.

About the 3D model

A generic outrunner drawn from EMAX’s published sizes: the 11 × 8 mm stator, 14.2 mm bell, 1.5 mm shaft and 9 teeth and 12 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.