Cobra C-2221-12 Motor Propeller Data
	Motor Wind		Motor Kv		No-Load Current		Motor Resistance		I Max	P Max (3S)
	12 Turn Delta		1250 RPM/Volt		Io = 0.99 Amps @ 10v		Rm = 50 Ohms		32 Amps	360 W
	Outside Diameter		Body Length		Total Shaft Length		Shaft Diameter		Motor Weight
	27.65 mm, 1.089 in.		37.00 mm, 1.457 in.		54.00 mm,  2.126 in.		4.00 mm,  0.157 in.		88 gm,   3.10 oz
	Prop	Prop	Input	Motor	Watts	Prop	Pitch Speed	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Voltage	Amps	Input	RPM	MPH	Grams	Ounces	Grams/W
	APC	7x6-E	11.1	14.66	162.8	11,989	68.1	734.4	25.90	4.51
	APC	7x6-SF	11.1	15.54	172.5	11,391	64.7	644.3	22.73	3.73
	APC	8x3.8-SF	11.1	17.46	193.8	11,141	40.1	970.9	34.25	5.01
	APC	8x4-E	11.1	16.05	178.2	11,781	44.6	883	31.15	4.96
	APC	8x6-E	11.1	23.29	258.5	10,744	61.0	1010.7	35.65	3.91
	APC	8x6-SF	11.1	27.73	307.8	9,706	55.1	1030.7	36.36	3.35
	APC	8x8-E	11.1	29.16	323.6	9,957	75.4	892.5	31.48	2.76
	APC	9x3.8-SF	11.1	22.75	252.5	10,406	37.4	1234.3	43.54	4.89
	APC	9x4.5-E	11.1	22.10	245.3	10,919	46.5	1230.7	43.41	5.02
	APC	9x4.7-SF	11.1	21.24	235.8	10,594	47.2	1216.9	42.92	5.16
	APC	9x6-E	11.1	25.35	281.4	10,467	59.5	1200.1	42.33	4.27
	APC	10x3.8-SF	11.1	32.73	363.3	8,975	32.3	1576.3	55.60	4.34
	APC	10x4.7-SF	11.1	33.60	372.9	8,814	39.2	1564.6	55.19	4.20
	APC	10x5-E	11.1	28.67	318.2	10,066	47.7	1430.7	50.47	4.50
	APC	10x6-E	11.1	31.27	347.1	9,649	54.8	1469.4	51.83	4.23
	APC	10x7-E	11.1	32.42	359.8	9,061	60.1	1362.9	48.07	3.79
	APC	11x5.5-E	11.1	36.43	404.3	8,942	46.6	1769.9	62.43	4.38
	GEM	8x4.5	11.1	20.87	231.6	10,656	45.4	1099.1	38.77	4.75
	GEM	9x4.7	11.1	23.27	258.3	10,313	45.9	1273.2	44.91	4.93
	GEM	10x4.5	11.1	31.83	353.3	9,091	38.7	1553.6	54.80	4.40
	GWS	8x4x3-DD	11.1	14.09	156.4	11,591	43.9	855	30.16	5.47
	GWS	9x5-DD	11.1	20.00	222.0	10,783	51.1	1200.7	42.35	5.41
	GWS	9x5x3-DD	11.1	24.75	274.7	10,137	48.0	1279.9	45.15	4.66
	GWS	10x6-DD	11.1	25.64	284.6	10,012	56.9	1391.2	49.07	4.89
	GWS	10x6x3-DD	11.1	31.26	347.0	9,188	52.2	1572.2	55.46	4.53
	MAS	7x4x3	11.1	11.51	127.7	11,973	45.4	590.2	20.82	4.62
	MAS	8x6x3	11.1	21.18	235.1	10,627	60.4	1055	37.21	4.49
	MAS	9x7x3	11.1	29.90	331.9	9,364	62.1	1375.2	48.51	4.14
	MAS	10x5x3	11.1	27.56	305.9	9,708	46.0	1454.5	51.31	4.76
	MAS	10x7x3	11.1	35.17	390.4	8,513	56.4	1561.9	55.09	4.00
	Prop	Prop	Input	Motor	Watts	Prop	Pitch Speed	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Voltage	Amps	Input	RPM	MPH	Grams	Ounces	Grams/W
	APC	6x5.5-E	14.8	13.24	196.0	15,945	83.0	579.8	20.45	2.96
	APC	7x4-E	14.8	16.61	245.9	15,409	58.4	1030.1	36.34	4.19
	APC	7x5-E	14.8	20.74	307.0	14,756	69.9	1033.3	36.45	3.37
	APC	7x6-E	14.8	21.57	319.2	14,635	83.2	1119.2	39.48	3.51
	APC	8x4-E	14.8	24.02	355.5	14,238	53.9	1378.8	48.64	3.88
	APC	8x6-E	14.8	33.26	492.2	12,741	72.4	1411.8	49.80	2.87
	APC	9x4.5-E	14.8	31.88	471.8	13,020	55.5	1851.3	65.30	3.92
	APC	9x6-E	14.8	35.62	527.2	12,338	70.1	1678.6	59.21	3.18
	MAS	7x4x3	14.8	17.52	259.2	15,257	57.8	1006.3	35.50	3.88
	MAS	8x6x3	14.8	31.31	463.4	13,090	74.4	1644.7	58.01	3.55
	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.