Cobra CM-2820/24 490Kv Motor Propeller Data
	Magnets	Motor Wind		Motor Kv		No-Load Current		Motor Resistance		I Max	P Max (6S)
	14-Pole	24-Turn Delta		490 RPM/Volt		Io = 0.53 Amps @ 15v		Rm = 0.111 Ohms		27 Amps	600 W
	Stator	Outside Diameter		Body Length		Total Shaft Length		Shaft Diameter		Motor Weight
	12-Slot	35.0 mm,  1.378 in.		46.4 mm,  1.827 in.		52.6 mm,  2.071 in.		5.00 mm,  0.197 in.		146 gm,   5.15 oz
	Test Data From		Input	12.0 V	15.0 V	18.0V	21.0V	Measured Kv value		Measured Rm Value
	Sample Motor		Io Value	0.47 A	0.53 A	0.58 A	0.63 A	490 RPM/Volt @ 15V		0.111 Ohms
	Prop	Prop	Li-Po	Input	Motor	Input	Prop	Pitch Speed	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Cells	Voltage	Amps	Watts	RPM	in MPH	Grams	Ounces	Grams/W
	APC	12x4.5-MR	4	14.8	9.41	139.3	6,351	27.1	1111	39.19	7.98
	APC	14x5.5-MR	4	14.8	15.34	227.0	5,827	30.3	1641	57.88	7.23
	APC	16x5.5-MR	4	14.8	21.30	315.2	5,277	27.5	2141	75.52	6.79
	APC	18x5.5-MR	4	14.8	25.96	384.2	4,767	24.8	2453	86.53	6.38
	GemFan	14x4.5-MR-W	4	14.8	13.02	192.7	6,025	25.7	1454	51.29	7.55
	GemFan	15x4.5-MR-W	4	14.8	14.08	208.4	5,919	25.2	1545	54.50	7.41
	GemFan	16x4.5-MR-W	4	14.8	18.53	274.2	5,533	23.6	1918	67.65	6.99
	RC-Timer	12x5.5-CF	4	14.8	11.44	169.3	6,189	32.2	1143	40.32	6.75
	RC-Timer	13x5.5-CF	4	14.8	14.97	221.6	5,850	30.5	1412	49.81	6.37
	RC-Timer	14x5.5-CF	4	14.8	19.53	289.0	5,392	28.1	1633	57.60	5.65
	RC-Timer	15x5.5-CF	4	14.8	25.05	370.7	4,891	25.5	1889	66.63	5.10
	RC-Timer	16x5.5-CF	4	14.8	27.77	411.0	4,588	23.9	2041	71.99	4.97
	Prop	Prop	Li-Po	Input	Motor	Input	Prop	Pitch Speed	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Cells	Voltage	Amps	Watts	RPM	in MPH	Grams	Ounces	Grams/W
	APC	11x4.5-MR	5	18.5	10.68	197.6	7,963	33.9	1316	46.42	6.66
	APC	12x4.5-MR	5	18.5	13.88	256.8	7,650	32.6	1651	58.24	6.43
	APC	14x5.5-MR	5	18.5	21.81	403.5	6,893	35.9	2366	83.46	5.86
	APC	16x5.5-MR	5	18.5	28.89	534.5	6,080	31.7	2850	100.53	5.33
	GemFan	12x4-MR-W	5	18.5	12.53	231.8	7,780	29.5	1516	53.47	6.54
	GemFan	13x4.5-MR-W	5	18.5	15.60	288.6	7,480	31.9	1812	63.92	6.28
	GemFan	14x4.5-MR-W	5	18.5	18.16	336.0	7,208	30.7	2070	73.02	6.16
	GemFan	15x4.5-MR-W	5	18.5	19.99	369.8	7,048	30.0	2251	79.40	6.09
	GemFan	16x4.5-MR-W	5	18.5	25.48	471.4	6,476	27.6	2656	93.69	5.63
	RC-Timer	11x5.5-CF	5	18.5	10.85	200.7	7,949	41.4	1211	42.72	6.03
	RC-Timer	12x5.5-CF	5	18.5	16.84	311.5	7,364	38.4	1682	59.33	5.40
	RC-Timer	13x5.5-CF	5	18.5	21.84	404.0	6,872	35.8	2031	71.64	5.03
	RC-Timer	14x5.5-CF	5	18.5	27.42	507.3	6,235	32.5	2234	78.80	4.40
	Prop	Prop	Li-Po	Input	Motor	Input	Prop	Pitch Speed	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Cells	Voltage	Amps	Watts	RPM	in MPH	Grams	Ounces	Grams/W
	APC	10x4.5-MR	6	22.2	11.66	258.9	9,571	40.8	1461	51.53	5.64
	APC	11x4.5-MR	6	22.2	14.72	326.8	9,247	39.4	1825	64.37	5.58
	APC	12x4.5-MR	6	22.2	18.80	417.4	8,834	37.6	2242	79.08	5.37
	APC	14x5.5-MR	6	22.2	28.46	631.8	7,794	40.6	3045	107.41	4.82
	GemFan	11x4-MR-W	6	22.2	12.62	280.2	9,473	35.9	1640	57.85	5.85
	GemFan	12x4-MR-W	6	22.2	16.68	370.3	9,049	34.3	2072	73.09	5.60
	GemFan	13x4.5-MR-W	6	22.2	20.61	457.5	8,631	36.8	2427	85.61	5.30
	GemFan	14x4.5-MR-W	6	22.2	24.03	533.5	8,255	35.2	2775	97.88	5.20
	GemFan	15x4.5-MR-W	6	22.2	26.35	585.0	7,994	34.1	2984	105.26	5.10
	GemFan	16x4.5-MR-W	6	22.2	32.05	711.5	7,235	30.8	3332	117.53	4.68
	RC-Timer	10x5.5-CF	6	22.2	9.88	219.3	9,773	50.9	1253	44.20	5.71
	RC-Timer	11x5.5-CF	6	22.2	14.98	332.6	9,220	48.0	1684	59.40	5.06
	RC-Timer	12x5.5-CF	6	22.2	22.83	506.8	8,408	43.8	2258	79.65	4.46
	RC-Timer	13x5.5-CF	6	22.2	28.79	639.1	7,703	40.1	2594	91.50	4.06
	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, at an altitude of
	512 feet above sea level.  The test voltages used are based on the standard output of a Li-Po battery under load, which is 3.70 volts
	per cell.  If you are using a battery that is larger in capacity than normal, or has a very high C-rating, then your actual voltages will
	be higher than those shown in the chart, and this will result in a higher current and power value for every prop used.  You should
	always test your actual power system with a watt meter before flying your model to make sure that you are not exceeding the
	recommended current and power ratings of the motor being used.  The prop recommendations in this chart assume that the motor
	receives adequate cooling throughout its operation.  If your motor is being used inside a cowl or fuselage, you must ensure that
	the motor receives sufficient airflow, and does not get too hot during operation.  It is always best to use a prop size that pulls no
	more than 80% of the motors maximum recommended current value to ensure safe operation under all conditions.