Cobra C4120/12 Motor Propeller Data
	Motor Wind		Motor Kv		No-Load Current		Motor Resistance		I Max	P Max (4S)
	12-Turn Delta		850 RPM/Volt		Io = 2.77 Amps @ 14v		Rm = 0.014 Ohms		75 Amps	1110 W
	Outside Diameter		Body Length		Total Shaft Length		Shaft Diameter		Motor Weight
	49.8 mm,  1.96 in.		51.8 mm,  2.04 in.		74.5 mm,  2.93 in.		6.00 mm,  0.236 in.		293 gm,   10.34 oz
	Prop	Prop	Input	Motor	Watts	Prop	Pitch	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Voltage	Amps	Input	RPM	Speed	Grams	Ounces	Grams/W
	APC	11x8.5-E	11.1	34.03	377.7	8,058	64.9	1668	58.84	4.42
	APC	11x10-E	11.1	40.48	449.3	7,873	74.6	1528	53.90	3.40
	APC	12x6-E	11.1	32.26	358.1	8,157	46.3	1986	70.05	5.55
	APC	12x8-E	11.1	40.73	452.1	7,866	59.6	1832	64.62	4.05
	APC	12x10-E	11.1	48.42	537.4	7,633	72.3	2002	70.62	3.73
	APC	12x12-E	11.1	54.92	609.6	7,392	84.0	1814	63.99	2.98
	APC	13x6.5-E	11.1	44.59	494.9	7,736	47.6	2497	88.08	5.05
	APC	13x8-E	11.1	48.36	536.8	7,614	57.7	2484	87.62	4.63
	APC	13x10-E	11.1	63.20	701.5	7,135	67.6	2274	80.21	3.24
	APC	14x7-E	11.1	55.33	614.1	7,410	49.1	2947	103.95	4.80
	APC	14x8.5-E	11.1	57.50	638.3	7,299	58.8	2998	105.75	4.70
	APC	14x10-E	11.1	57.12	634.0	7,326	69.4	2938	103.63	4.63
	APC	14x12-E	11.1	76.89	853.5	6,506	73.9	2268	80.00	2.66
	APC	15x4-E	11.1	44.15	490.0	7,740	29.3	2902	102.36	5.92
	APC	15x6-E	11.1	57.68	640.2	7,310	41.5	3327	117.36	5.20
	APC	15x8-E	11.1	60.37	670.1	7,224	54.7	3265	115.17	4.87
	APC	15x10-E	11.1	80.62	894.8	6,546	62.0	3322	117.18	3.71
	APC	16x8-E	11.1	85.13	944.9	6,397	48.5	3826	134.96	4.05
	MAS	12x6x3	11.1	35.83	397.7	8,075	45.9	2120	74.78	5.33
	MAS	12x8x3	11.1	49.91	554.0	7,604	57.6	2655	93.65	4.79
	MAS	13x8x3	11.1	55.17	612.3	7,420	56.2	2944	103.85	4.81
	MAS	14x7x3	11.1	62.99	699.2	7,152	47.4	3350	118.17	4.79
	MAS	14x9x3	11.1	70.84	786.3	6,743	57.5	3525	124.34	4.48
	MAS	15x7x3	11.1	76.03	843.9	6,760	44.8	3862	136.23	4.58
	Prop	Prop	Input	Motor	Watts	Prop	Pitch	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Voltage	Amps	Input	RPM	Speed	Grams	Ounces	Grams/W
	APC	10x6-E	14.8	30.46	450.8	11,016	62.6	1903	67.13	4.22
	APC	10x7-E	14.8	36.39	538.5	10,774	71.4	1985	70.02	3.69
	APC	10x10-E	14.8	54.46	805.9	10,269	97.2	1858	65.54	2.31
	APC	11x5.5-E	14.8	40.96	606.3	10,755	56.0	2638	93.05	4.35
	APC	11x7-E	14.8	47.52	703.2	10,365	68.7	2743	96.76	3.90
	APC	11x8-E	14.8	53.91	797.9	10,297	78.0	2620	92.42	3.28
	APC	11x8.5-E	14.8	58.31	862.9	10,139	81.6	2665	94.00	3.09
	APC	11x10-E	14.8	66.28	981.0	9,851	93.3	2452	86.49	2.50
	APC	12x6-E	14.8	55.54	822.0	10,248	58.2	3339	117.78	4.06
	APC	12x8-E	14.8	66.81	988.8	9,844	74.6	2927	103.25	2.96
	APC	12x10-E	14.8	79.83	1181.5	9,349	88.5	2965	104.59	2.51
	APC	13x4-E	14.8	46.35	686.0	10,577	40.1	3329	117.43	4.85
	APC	13x6.5-E	14.8	75.26	1113.9	9,550	58.8	3888	137.14	3.49
	APC	15x4-E	14.8	74.55	1103.4	9,540	36.1	4742	167.27	4.30
	MAS	10x5x3	14.8	28.50	421.8	11,271	53.4	1986	70.05	4.71
	MAS	10x7x3	14.8	41.60	615.7	10,754	71.3	2536	89.45	4.12
	MAS	11x7x3	14.8	50.25	743.7	10,438	69.2	3022	106.60	4.06
	MAS	11x8x3	14.8	54.70	809.6	10,281	77.9	3055	107.76	3.77
	MAS	12x6x3	14.8	56.60	837.7	10,213	58.0	3476	122.61	4.15
	MAS	12x8x3	14.8	75.06	1110.8	9,360	70.9	4110	144.97	3.70
	Prop	Prop	Input	Motor	Watts	Prop	Pitch	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Voltage	Amps	Input	RPM	Speed	Grams	Ounces	Grams/W
	APC	9x7.5-E	18.5	56.20	1039.7	13,061	92.8	2265	79.89	2.18
	APC	9x9-E	18.5	61.16	1131.5	12,858	109.6	2290	80.78	2.02
	APC	10x5-E	18.5	43.62	807.0	13,501	63.9	2622	92.49	3.25
	APC	10x6-E	18.5	47.89	886.0	13,321	75.7	2739	96.61	3.09
	APC	10x7-E	18.5	56.48	1044.8	12,979	86.0	2902	102.36	2.78
	APC	10x10-E	18.5	79.55	1471.6	12,118	114.8	2603	91.82	1.77
	APC	11x5.5-E	18.5	63.29	1170.8	12,760	66.5	3776	133.19	3.23
	APC	11x7-E	18.5	75.53	1397.2	12,305	81.6	3795	133.86	2.72
	APC	12x6-E	18.5	85.71	1585.7	11,930	67.8	4543	160.25	2.86
	APC	13x4-E	18.5	70.95	1312.6	12,467	47.2	4885	172.31	3.72
	MAS	9x7x3	18.5	45.97	850.4	13,467	89.3	2922	103.07	3.44
	MAS	10x5x3	18.5	41.33	764.7	13,665	64.7	2977	105.01	3.89
	MAS	10x7x3	18.5	59.73	1105.0	12,919	85.6	3741	131.96	3.39
	MAS	11x7x3	18.5	71.53	1323.3	12,476	82.7	4319	152.35	3.26
	MAS	11x8x3	18.5	79.50	1470.8	12,157	92.1	4268	150.55	2.90
	MAS	12x6x3	18.5	80.50	1489.2	12,116	68.8	4950	174.60	3.32
	Propeller Chart Color Code Explanation
		The prop is to small to get good performance from the motor. (Less than 50% power)
		The prop is sized right to get good power from the motor. (50 to 80% power)
		The prop can be used, but full throttle should be kept to short bursts. (80 to 100% power)
		The prop is too big for the motor and should not be used. (Over 100% power)
	PLEASE NOTE:
	The data contained in this prop chart is based on actual measurements taken in a controlled test
	environment.  The test voltages used are based on a properly sized Li-Po battery for the current
	draw of the motor being tested.  If you are using a larger than normal capacity battery, or a very
	high C-Rated battery, your actual voltages will be higher than those shown in this chart, and this
	will result in higer current draw for each prop used.  You should always test your power system
	with a watt meter whenever a prop is used to ensure that you are not exceeding the recommended
	rating of the motor being used.  The prop recommendations in this chart are based on the motor
	receiving adequate cooling throughout its operation.  If your motor is being used inside a cowl, you
	must provide adequate cooling to the motor and make sure that the motor is not getting too hot
	during operation.