Overview

The EMAX RS1108 is a brushless motor for micro FPV racing quad builds, offered in 4500KV / 5200KV / 6000KV options. It uses a 9N12P framework and is intended for 2S setups with 2″3″ propellers.

Key Features

KV options: 4500KV / 5200KV / 6000KV
Framework: 9N12P
Supports 2S operation
Recommended propeller size: 2″3″
1.5 mm shaft diameter
Motor weight: 8.2 g (without silicone wire)
Max thrust: 266 g (on 2S)

For setup and compatibility assistance, contact [email protected] or visit https://rcdrone.top/.

Specifications

Model	EMAX RS1108
Framework	9N12P
KV	4500KV / 5200KV / 6000KV
Length	20.5MM
Diameter	14.2MM
No. of cells	2S
Max thrust	266 g (on 2S)
Shaft diameter	1.5 mm
Propeller	2″3″
Weight	8.2 g (W/O silicone wire)

Test Data

RS1108-4500KV (Single strand winding) Sample Test Report

Non-loaded: 8V, 0.6 A, 37500 rpm
Motor weight: 8.2 g (no included with silicone wire)
Silicone wire weight: 0.5 g
Silicone wire: 28AWG, 70 mm length

RS1108-4500KV @ 16V Propeller: RotorX RX3025

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	41	16.00	2.56	16200
2	80	32.00	2.50	22020
3	128	48.00	2.67	26470
4	163	64.00	2.55	30550
5	202	80.00	2.53	33980
6	235	96.00	2.45	36330
7	262	112.00	2.34	38310
8	300	128.00	2.34	39870
9	336	144.00	2.33	41500
10	353	160.00	2.21	42470
11	383	176.00	2.18	44100
12	400	192.00	2.08	45660
13.2	428	211.20	2.03	Max

RS1108-4500KV @ 16V Propeller: GF3020

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	44	16.00	2.75	17900
2	83	32.00	2.59	22450
3	126	48.00	2.63	28350
4	168	64.00	2.63	31630
5	195	80.00	2.44	34550
6	226	96.00	2.35	36930
7	250	112.00	2.23	38530
8	272	128.00	2.13	40790
9	295	144.00	2.05	42450
10	330	160.00	2.06	43270
11	366	176.00	2.08	44680
12	386	192.00	2.01	45340
13.6	430	217.60	1.98	Max

RS1108-4500KV @ 16V Propeller: EMAX T2345BN

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	39	16.00	2.44	16290
2	73	32.00	2.28	22040
3	101	48.00	2.10	25250
4	136	64.00	2.13	30290
5	160	80.00	2.00	32900
6	188	96.00	1.96	35350
7	210	112.00	1.88	37090
8	230	128.00	1.80	38990
9	247	144.00	1.72	40720
10	266	160.00	1.66	41830
11	290	176.00	1.65	43500
12	315	192.00	1.64	44900
13	346	208.00	1.66	Max

RS1108-4500KV @ 16V Propeller: GF3025

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	45	16.00	2.81	16240
2	86	32.00	2.69	22000
3	125	48.00	2.60	26440
4	169	64.00	2.64	30350
5	205	80.00	2.56	33490
6	235	96.00	2.45	35620
7	265	112.00	2.37	37480
8	297	128.00	2.32	39970
9	330	144.00	2.29	41800
10	350	160.00	2.19	42340
11	367	176.00	2.09	43640
12	395	192.00	2.06	44500
13.4	432	214.40	2.01	Max

RS1108-4500KV @ 12V Propeller: RotorX RX3025

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	43	12.00	3.58	16350
2	83	24.00	3.46	22280
3	120	36.00	3.33	26250
4	159	48.00	3.31	29950
5	190	60.00	3.17	32420
6	218	72.00	3.03	34130
7	242	84.00	2.88	36590
8	266	96.00	2.77	38310
9	299	108.00	2.77	Max

RS1108-4500KV @ 12V Propeller: GF3020

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	40	12.00	3.33	16120
2	77	24.00	3.21	21600
3	115	36.00	3.19	25730
4	152	48.00	3.17	28420
5	184	60.00	3.07	31710
6	211	72.00	2.93	33810
7	235	84.00	2.80	35380
8	254	96.00	2.65	36370
9.5	302	114.00	2.65	Max

RS1108-4500KV @ 12V Propeller: EMAX T2345BN

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	33	12.00	2.75	15180
2	62	24.00	2.58	20850
3	92	36.00	2.56	25680
4	122	48.00	2.54	29370
5	148	60.00	2.47	31570
6	171	72.00	2.38	34010
7	192	84.00	2.29	36130
8	206	96.00	2.15	37230
9	237	108.00	2.19	Max

RS1108-4500KV @ 12V Propeller: GF3025

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	40	12.00	3.33	16090
2	80	24.00	3.33	21610
3	119	36.00	3.31	26010
4	159	48.00	3.31	30080
5	189	60.00	3.15	32550
6	213	72.00	2.96	34890
7	240	84.00	2.86	36620
8	267	96.00	2.78	38050
9	303	108.00	2.81	Max

RS1108-4500KV @ 12V Propeller: AVAN mini

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	46	12.00	3.83	12130
2	79	24.00	3.29	15550
3	108	36.00	3.00	18360
4	133	48.00	2.77	19980
5	155	60.00	2.58	21620
6	171	72.00	2.38	22720
7	190	84.00	2.26	24430
8	212	96.00	2.21	25680
9	234	108.00	2.17	26910
10	247	120.00	2.06	27510
11	258	132.00	1.95	28230
12	269	144.00	1.87	28670
13.7	336	164.40	2.04	Max

RS1108-5200KV (Single strand winding) Sample Test Report

Non-loaded: 8V, 0.66 A, 42700 rpm
Motor weight: 8.2 g (no included with silicone wire)
Silicone wire weight: 0.5 g
Silicone wire: 28AWG, 70 mm length

RS1108-5200KV @ 16V Propeller: RotorX RX2535B

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	32	16.00	2.00	16780
2	56	32.00	1.75	22330
3	95	48.00	1.98	28950
4	132	64.00	2.06	33760
5	166	80.00	2.08	37890
6	183	96.00	1.91	39840
7	221	112.00	1.97	43980
8	250	128.00	1.95	46620
9	273	144.00	1.90	48630
10	292	160.00	1.83	50500
11	313	176.00	1.78	51860
12	323	192.00	1.68	53720
13.5	360	216.00	1.67	Max

RS1108-5200KV @ 16V Propeller: HGLRC 2030 Tri-Blade

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	24	16.00	1.50	19470
2	48	32.00	1.50	23730
3	84	48.00	1.75	36410
4	121	64.00	1.89	44740
5	161	80.00	2.01	51980
6	192	96.00	2.00	58520
7	222	112.00	1.98	64290
7.9	250	126.40	1.98	Max

RS1108-5200KV @ 16V Propeller: HGLRC 2035 5-Blade

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	25	16.00	1.56	17110
2	49	32.00	1.53	22730
3	78	48.00	1.63	29700
4	105	64.00	1.64	34730
5	132	80.00	1.65	39880
6	160	96.00	1.67	43650
7	189	112.00	1.69	46900
8	210	128.00	1.64	49960
9	232	144.00	1.61	52760
10	253	160.00	1.58	54960
11	268	176.00	1.52	56160
12	294	192.00	1.53	Max

RS1108-5200KV @ 16V Propeller: GF3020

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	45	16.00	2.81	16920
2	80	32.00	2.50	22080
3	106	48.00	2.21	25570
4	149	64.00	2.33	30250
5	182	80.00	2.28	32870
6	209	96.00	2.18	35070
7	235	112.00	2.10	37080
8	272	128.00	2.13	39650
9	292	144.00	2.03	40970
10	315	160.00	1.97	42270
11	331	176.00	1.88	43610
12	353	192.00	1.84	44670
13	369	208.00	1.77	45360
14	383	224.00	1.71	46010
15	395	240.00	1.65	46670
16	409	256.00	1.60	47190
17.5	436	280.00	1.56	Max

RS1108-5200KV @ 16V Propeller: EMAX T2345BN

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	39	16.00	2.44	16460
2	62	32.00	1.94	20850
3	87	48.00	1.81	24850
4	120	64.00	1.88	29070
5	141	80.00	1.76	31820
6	160	96.00	1.67	33740
7	182	112.00	1.63	36200
8	200	128.00	1.56	37120
9	232	144.00	1.61	38380
10	253	160.00	1.58	39380
11	271	176.00	1.54	40270
12	283	192.00	1.47	41080
13	295	208.00	1.42	41930
14	313	224.00	1.40	42760
15	338	240.00	1.41	43620
16	360	256.00	1.41	44800
17	382	272.00	1.40	Max

RS1108-5200KV @ 12V Propeller: RotorX RX3025

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	38	12.00	3.17	15640
2	71	24.00	2.96	20830
3	104	36.00	2.89	24870
4	148	48.00	3.08	29300
5	178	60.00	2.97	31770
6	203	72.00	2.82	34200
7	231	84.00	2.75	35990
8	256	96.00	2.67	37690
9	278	108.00	2.57	39600
10	294	120.00	2.45	40900
11.1	351	133.20	2.64	Max

RS1108-5200KV @ 12V Propeller: GF3020

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	38	12.00	3.17	15410
2	71	24.00	2.96	20410
3	104	36.00	2.89	24380
4	148	48.00	3.08	28340
5	175	60.00	2.92	30580
6	202	72.00	2.81	32570
7	225	84.00	2.68	34210
8	247	96.00	2.57	35860
9	269	108.00	2.49	37050
10	281	120.00	2.34	37970
11	294	132.00	2.23	38630
12.2	358	146.40	2.45	Max

RS1108-5200KV @ 12V Propeller: EMAX T2345BN

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	31	12.00	2.58	14900
2	58	24.00	2.42	19960
3	82	36.00	2.28	24220
4	117	48.00	2.44	28060
5	138	60.00	2.30	30690
6	158	72.00	2.19	33410
7	182	84.00	2.17	35240
8	201	96.00	2.09	37100
9	221	108.00	2.05	38020
10	233	120.00	1.94	39470
11.7	276	140.40	1.97	Max

RS1108-5200KV @ 12V Propeller: GF3025

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	39	12.00	3.25	15260
2	74	24.00	3.08	20590
3	108	36.00	3.00	24580
4	152	48.00	3.17	28870
5	181	60.00	3.02	31380
6	208	72.00	2.89	33870
7	233	84.00	2.77	35860
8	259	96.00	2.70	37140
9	282	108.00	2.61	38500
10	295	120.00	2.46	39670
11.8	358	141.60	2.53	Max

RS1108-6000KV (Single Strand Winding) Sample Test Report

Non-loaded: 7V, 0.68 A, 43000 rpm
Motor weight: 8.2 g (no included with silicone wire)
Silicone wire weight: 0.5 g
Silicone wire: 28AWG, 70 mm length

RS1108-6000KV @ 8V Propeller: GF3020

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	28	8.00	3.50	13440
2	57	16.00	3.56	18380
3	89	24.00	3.71	21890
4	114	32.00	3.56	25100
5	143	40.00	3.58	27710
6	166	48.00	3.46	29520
7	186	56.00	3.32	31300
8	205	64.00	3.20	32530
9	217	72.00	3.01	33540
9.8	237	78.40	3.02	Max

RS1108-6000KV @ 8V Propeller: EMAX T2345BN

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	25	8.00	3.13	13250
2	48	16.00	3.00	17810
3	73	24.00	3.04	21580
4	93	32.00	2.91	24830
5	112	40.00	2.80	28010
6	133	48.00	2.77	29820
7	149	56.00	2.66	31270
8	167	64.00	2.61	33025
9.6	187	76.80	2.43	Max

RS1108-6000KV @ 8V Propeller: GF3025

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	30	8.00	3.75	13630
2	58	16.00	3.63	18420
3	90	24.00	3.75	22210
4	118	32.00	3.69	25230
5	148	40.00	3.70	28170
6	172	48.00	3.58	30150
7	190	56.00	3.39	31960
8	210	64.00	3.28	33650
9.5	240	76.00	3.16	Max

RS1108-6000KV @ 8V Propeller: AVAN mini

Current (A)	Thrust (G)	Power (W)	Efficiency (G/W)	Speed (RPM)
1	33	8.00	4.13	10410
2	59	16.00	3.69	13530
3	83	24.00	3.46	15860
4	102	32.00	3.19	17530
5	122	40.00	3.05	18970
6	139	48.00	2.90	20430
7	155	56.00	2.77	21680
8	167	64.00	2.61	22310
9	182	72.00	2.53	23240
10	192	80.00	2.40	23980
11	204	88.00	2.32	24680
12	215	96.00	2.24	25030
13	226	104.00	2.24	26280
14.9	266	119.20	2.23	Max

Applications

Micro FPV racing quad builds using 2″3″ propellers
2S micro quad configurations

Details

Test data summarizes RS1108 performance with different 2″3″ propellers, including thrust, current draw, and efficiency.

4500KV measurements at 12V provide a quick reference for prop selection and expected amperage on lightweight racing setups.

5200KV test results compare several prop options so you can balance top-end RPM against efficiency.

No-load information and additional 12V runs help confirm baseline motor behavior before tuning your build.

Prop-by-prop results highlight how thrust and g/W efficiency change between common 3″ blades.

6000KV data focuses on higher-RPM output, with side-by-side prop tests to guide setup choices.

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EMAX RS1108 4500KV/5200KV/6000KV Brushless Motor for Micro FPV Racing Quad, 2S 9N12P