Cobra CM-2208/20 Motor Propeller Data
	Magnets	Motor Wind		Motor Kv		No-Load Current		Motor Resistance		I Max	P Max (3S)
	14-Pole	20-Turn Delta		2000 RPM/Volt		Io = 0.77 Amps @ 10v		Rm = 0.076 Ohms		20 Amps	220 W
	Stator	Outside Diameter		Body Length		Total Shaft Length		Shaft Diameter		Motor Weight
	12-Slot	27.7 mm,  1.091 in.		24.0 mm,  0.945 in.		45.2 mm,  1.780 in.		3.17 mm,  0.125 in.		44.2 gm,   1.56 oz
	Test Data From		Input	6.0 V	8.0 V	10.0V	12.0V	Measured Kv value		Measured Rm Value
	Sample Motor		Io Value	0.59 A	0.67 A	0.77 A	0.87 A	1988 RPM/Volt @ 10v		0.076 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	5.25x4.75-E	3	11.1	13.34	148.1	17,507	78.7	451	15.91	3.05
	APC	5.5x4.5-E	3	11.1	13.67	151.7	17,388	74.1	456	16.08	3.01
	APC	6x4-E	3	11.1	14.87	165.1	17,003	64.4	630	22.22	3.82
	APC	7x4-SF	3	11.1	21.82	242.2	13,985	53.0	840	29.63	3.47
	APC	7x5-E	3	11.1	24.02	266.6	13,272	62.8	797	28.11	2.99
	FC	5x4.5	3	11.1	8.66	96.1	19,061	81.2	428	15.10	4.45
	FC	5x4.5x3	3	11.1	12.38	137.4	17,825	76.0	534	18.84	3.89
	FC	6x4.5	3	11.1	15.47	171.7	16,792	71.6	721	25.43	4.20
	GemFan	5x3	3	11.1	6.67	74.0	19,801	56.3	374	13.19	5.05
	HQ	5x4	3	11.1	7.13	79.1	18,182	68.9	373	13.16	4.71
	HQ	5x4x3	3	11.1	9.25	102.7	17,401	65.9	449	15.84	4.37
	HQ	5x4.5-BN	3	11.1	11.17	124.0	16,902	72.0	487	17.18	3.93
	HQ	6x3	3	11.1	7.34	81.5	18,128	51.5	419	14.78	5.14
	HQ	6x4.5	3	11.1	13.53	150.2	16,206	69.1	645	22.75	4.29
	HQ	6x4.5x3	3	11.1	17.60	195.4	15,137	64.5	762	26.88	3.90
	HQ	7x4	3	11.1	20.71	229.9	14,250	54.0	850	29.98	3.70
	HQ	7x4.5	3	11.1	20.31	225.4	14,351	61.2	865	30.51	3.84
	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	5.25x4.75-E	4	14.8	17.29	255.9	20,560	92.5	603	21.27	2.36
	APC	5.5x4.5-E	4	14.8	17.87	264.5	20,436	87.1	635	22.40	2.40
	APC	6x4-E	4	14.8	20.15	298.2	19,829	75.1	837	29.52	2.81
	FC	5x4.5	4	14.8	10.89	161.2	22,511	95.9	588	20.74	3.65
	FC	5x4.5x3	4	14.8	16.43	243.2	20,828	88.8	718	25.33	2.95
	FC	6x4.5	4	14.8	20.09	297.3	19,809	84.4	998	35.20	3.36
	HQ	4x4.5-BN	4	14.8	10.45	154.7	22,661	96.6	477	16.83	3.08
	HQ	5x3	4	14.8	6.88	101.8	23,580	67.0	442	15.59	4.34
	HQ	5x4	4	14.8	10.22	151.3	22,739	86.1	589	20.78	3.89
	HQ	5x4x3	4	14.8	13.26	196.2	21,763	82.4	710	25.04	3.62
	HQ	5x4.5-BN	4	14.8	16.10	238.3	20,899	89.1	744	26.24	3.12
	HQ	6x3	4	14.8	11.06	163.7	22,512	64.0	679	23.95	4.15
	HQ	6x4.5	4	14.8	19.62	290.4	19,948	85.0	982	34.64	3.38
	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.