Cobra C-2221-10 Motor Propeller Data
	Motor Wind		Motor Kv		No-Load Current		Motor Resistance		I Max	P Max (3S)
	10 Turn Delta		1500 RPM/Volt		Io = 1.37 Amps @ 10v		Rm = 37 Ohms		38 Amps	420 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	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Voltage	Amps	Input	RPM	Speed	Grams	Ounces	Grams/W
	APC	7x4-E	11.1	16.39	181.9	14,134	53.5	845	29.81	4.64
	APC	7x4-SF	11.1	17.20	190.9	14,019	53.1	833.4	29.40	4.37
	APC	7x5-E	11.1	20.44	226.9	13,559	64.2	841.7	29.69	3.71
	APC	7x5-SF	11.1	21.11	234.3	13,472	63.8	877.8	30.96	3.75
	APC	7x6-E	11.1	21.73	241.2	13,399	76.1	927.8	32.73	3.85
	APC	7x6-SF	11.1	24.86	276.0	12,948	73.6	834.3	29.43	3.02
	APC	8x3.8-SF	11.1	27.76	308.1	12,565	45.2	1268.9	44.76	4.12
	APC	8x4-E	11.1	23.86	264.8	13,097	49.6	1139.9	40.21	4.30
	APC	8x6-E	11.1	34.16	379.1	11,654	66.2	1214.3	42.83	3.20
	APC	8x6-SF	11.1	41.31	458.5	10,624	60.4	1225.9	43.24	2.67
	APC	8x8-E	11.1	40.89	453.9	10,673	80.9	1023.3	36.10	2.25
	APC	9x3.8-SF	11.1	35.06	389.2	11,543	41.5	1559.4	55.01	4.01
	APC	9x4.5-E	11.1	31.82	353.2	11,972	51.0	1512.4	53.35	4.28
	APC	9x4.7-SF	11.1	31.68	351.6	12,011	53.5	1537.5	54.23	4.37
	APC	9x6-E	11.1	36.06	400.3	11,378	64.6	1412.1	49.81	3.53
	APC	10x5-E	11.1	40.09	445.0	10,785	51.1	1694.8	59.78	3.81
	GEM	8x4.5	11.1	31.83	353.3	11,973	51.0	1395.5	49.22	3.95
	GEM	9x4.7	11.1	34.38	381.7	11,607	51.7	1587.4	55.99	4.16
	GEM	10x4.5	11.1	45.69	507.2	9,781	41.7	1831.8	64.61	3.61
	MAS	7x4x3	11.1	17.99	199.7	13,921	52.7	835.4	29.47	4.18
	MAS	8x6x3	11.1	31.92	354.3	11,978	68.1	1367.5	48.24	3.86
	MAS	9x7x3	11.1	43.33	481.0	10,284	68.2	1659.7	58.54	3.45
	MAS	10x5x3	11.1	40.33	447.7	10,657	50.5	1778	62.72	3.97
	Prop	Prop	Input	Motor	Watts	Prop	Pitch	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Voltage	Amps	Input	RPM	Speed	Grams	Ounces	Grams/W
	APC	6x4-E	14.8	16.51	244.3	19,345	73.3	830.7	29.30	3.40
	APC	6x5.5-E	14.8	21.46	317.6	18,546	96.6	776.1	27.38	2.44
	APC	7x4-E	14.8	27.88	412.6	17,516	66.3	1360.7	48.00	3.30
	APC	7x5-E	14.8	32.60	482.5	16,379	77.6	1303.1	45.97	2.70
	APC	7x6-E	14.8	33.84	500.8	16,226	92.2	1412.2	49.81	2.82
	APC	8x4-E	14.8	38.81	574.4	15,827	60.0	1693.7	59.74	2.95
	MAS	7x4x3	14.8	27.80	411.4	17,536	66.4	1347.8	47.54	3.28
	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.