Cobra C-2217/7 Motor Propeller Data
	Magnets	Motor Wind		Motor Kv		No-Load Current		Motor Resistance		I Max	P Max (4S)
	14-Pole	7-Turn Delta		2500 RPM/Volt		Io = 2.73 Amps @ 10v		Rm = 0.020 Ohms		50 Amps	740 W
	Stator	Outside Diameter		Body Length		Total Shaft Length		Shaft Diameter		Motor Weight
	12-Slot	27.8 mm,  1.094 in.		32.0 mm,  1.259 in.		47.0 mm,  1.850 in.		3.17 mm,  0.125 in.		74.0 gm,   2.61 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	1.956 A	2.252 A	2.726 A	2.862 A	2563 RPM/Volt @ 10v		0.0198 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	4.75x4.25	3	11.1	24.12	267.8	25,359	102.1	566	19.96	2.11
	APC	4.75x4.75	3	11.1	26.98	299.5	25,022	112.6	562	19.82	1.88
	APC	4.75x5.5-E	3	11.1	29.93	332.2	24,635	128.3	526	18.55	1.58
	APC	5x4.3-MR	3	11.1	34.19	379.5	24,170	98.4	983	34.67	2.59
	APC	5x4.5-MR	3	11.1	34.97	388.1	24,021	102.4	967	34.11	2.49
	APC	5x4.6-MR	3	11.1	35.46	393.6	23,969	104.4	1031	36.37	2.62
	APC	5x5-E	3	11.1	30.89	342.9	24,461	115.8	599	21.13	1.75
	APC	5.25x4.75-E	3	11.1	35.01	388.6	23,918	107.6	804	28.36	2.07
	APC	5.5x4.5-E	3	11.1	35.59	395.1	23,820	101.5	856	30.19	2.17
	APC	6x4-E	3	11.1	40.33	447.6	23,344	88.4	1134	40.00	2.53
	APC	6x4.3-MR	3	11.1	50.15	556.7	21,685	88.3	1499	52.87	2.69
	APC	6x4.5-MR	3	11.1	47.96	532.3	21,991	93.7	1504	53.05	2.83
	APC	6x5.5-E	3	11.1	48.38	537.0	21,903	114.1	1067	37.64	1.99
	HQ	4x4.5-BN	3	11.1	20.89	231.9	25,822	110.0	614	21.66	2.65
	HQ	5x4	3	11.1	20.29	225.3	25,925	98.2	768	27.09	3.41
	HQ	5x4.5	3	11.1	21.61	239.8	25,714	109.6	773	27.27	3.22
	HQ	5x4.5-BN	3	11.1	34.18	379.4	24,167	103.0	1053	37.14	2.78
	HQ	6x3	3	11.1	20.68	229.6	25,900	73.6	869	30.65	3.78
	HQ	6x4.5	3	11.1	41.04	455.5	23,313	99.3	1410	49.74	3.10
	HQ	6x4.5-BN	3	11.1	52.69	584.8	21,377	91.1	1536	54.18	2.63
	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	4x4.5-MR	4	14.8	31.21	461.9	32,783	139.7	850	29.98	1.84
	APC	4.1x4.1-E	4	14.8	24.16	357.5	33,728	131.0	623	21.98	1.74
	APC	4.5x4.1-E	4	14.8	31.25	462.5	32,705	127.0	866	30.55	1.87
	APC	4.75x4.25	4	14.8	37.91	561.1	31,882	128.3	897	31.64	1.60
	APC	4.75x4.75	4	14.8	42.14	623.7	31,320	140.9	886	31.25	1.42
	APC	4.75x5.5-E	4	14.8	45.68	676.0	30,850	160.7	823	29.03	1.22
	APC	5x4.3-MR	4	14.8	54.18	801.9	29,818	121.4	1505	53.09	1.88
	APC	5x5-E	4	14.8	47.66	705.4	30,538	144.6	917	32.35	1.30
	APC	5.25x4.75-E	4	14.8	55.34	819.1	29,571	133.0	1233	43.49	1.51
	HQ	4x4.5-BN	4	14.8	31.13	460.7	32,817	139.8	989	34.89	2.15
	HQ	5x4	4	14.8	31.11	460.5	32,850	124.4	1250	44.09	2.71
	HQ	5x4.5	4	14.8	33.76	499.6	32,447	138.3	1230	43.39	2.46
	HQ	5x4.5-BN	4	14.8	51.38	760.5	30,212	128.7	1640	57.85	2.16
	HQ	6x3	4	14.8	32.99	488.3	32,624	92.7	1449	51.11	2.97
	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
	584 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.