Cobra C-2221-8 Motor Propeller Data
	Motor Wind		Motor Kv		No-Load Current		Motor Resistance		I Max	P Max (3S)
	8 Turn Delta		1860 RPM/Volt		Io = 1.90 Amps @ 10v		Rm = 33 Ohms		45 Amps	500 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	7x5-E	7.4	18.39	136.0	11,525	54.6	601.9	21.23	4.42
	APC	7x6-E	7.4	19.58	144.9	11,386	64.7	662.3	23.36	4.57
	APC	7x6-SF	7.4	22.41	165.8	11,051	62.8	601.3	21.21	3.63
	APC	8x3.8-SF	7.4	24.81	183.6	10,759	38.7	897.6	31.66	4.89
	APC	8x4-E	7.4	21.44	158.7	11,162	42.3	806.7	28.46	5.08
	APC	8x6-E	7.4	30.60	226.5	10,065	57.2	894.1	31.54	3.95
	APC	8x6-SF	7.4	37.58	278.1	9,219	52.4	911	32.13	3.28
	APC	8x8-E	7.4	37.24	275.6	9,254	70.1	760.7	26.83	2.76
	APC	9x3.8-SF	7.4	31.56	233.5	9,910	35.7	1113.4	39.27	4.77
	APC	9x4.5-E	7.4	28.71	212.4	10,288	43.8	1077.1	37.99	5.07
	APC	9x4.7-SF	7.4	29.62	219.2	10,176	45.3	1103.3	38.92	5.03
	APC	9x6-E	7.4	32.97	244.0	9,776	55.5	1033.6	36.46	4.24
	APC	9x7.5-SF	7.4	42.34	313.3	8,617	61.2	977.3	34.47	3.12
	APC	10x3.8-SF	7.4	43.64	323.0	8,445	30.4	1375	48.50	4.26
	APC	10x4.7-SF	7.4	44.87	332.1	8,293	36.9	1361.9	48.04	4.10
	APC	10x5-E	7.4	36.52	270.2	9,342	44.2	1245.1	43.92	4.61
	APC	10x6-E	7.4	39.74	294.1	8,956	50.9	1264.7	44.61	4.30
	APC	10x7-E	7.4	43.64	322.9	8,452	56.0	1205.7	42.53	3.73
	APC	11x5.5-E	7.4	45.62	337.6	8,247	43.0	1451.3	51.19	4.30
	GEM	8x4.5	7.4	29.26	216.5	10,220	43.6	1000.8	35.30	4.62
	GEM	9x4.7	7.4	32.13	237.8	9,876	44.0	1145.2	40.40	4.82
	GEM	10x4.5	7.4	43.09	318.8	8,528	36.3	1363	48.08	4.27
	GWS	8x4x3-DD	7.4	20.40	151.0	11,306	42.8	816.4	28.80	5.41
	GWS	9x5-DD	7.4	27.92	206.6	10,378	49.1	1087.2	38.35	5.26
	GWS	9x5x3-DD	7.4	33.65	249.0	9,725	46.0	1136.4	40.08	4.56
	GWS	10x6-DD	7.4	35.07	259.5	9,521	54.1	1229	43.35	4.74
	GWS	10x6x3-DD	7.4	42.19	312.2	8,624	49.0	1381.7	48.74	4.43
	MAS	7x4x3	7.4	18.62	137.8	11,527	43.7	380.1	13.41	2.76
	MAS	8x6x3	7.4	29.53	218.5	10,196	57.9	962	33.93	4.40
	MAS	9x7x3	7.4	40.79	301.8	8,808	58.4	1191.2	42.02	3.95
	MAS	10x5x3	7.4	37.75	279.3	9,167	43.4	1289	45.47	4.61
	MAS	10x7x3	7.4	47.07	348.3	7,935	52.6	1349	47.58	3.87
	Prop	Prop	Input	Motor	Watts	Prop	Pitch Speed	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Voltage	Amps	Input	RPM	MPH	Grams	Ounces	Grams/W
	APC	6x4-E	11.1	18.43	204.6	18,129	68.7	737.9	26.03	3.61
	APC	6x5.5-E	11.1	23.78	263.9	17,350	90.4	687.1	24.24	2.60
	APC	7x4-E	11.1	29.95	332.4	16,461	62.4	1189	41.94	3.58
	APC	7x5-E	11.1	36.24	402.2	15,406	72.9	1113.2	39.27	2.77
	APC	7x6-E	11.1	36.55	405.7	15,365	87.3	1239.5	43.72	3.05
	APC	8x3.8-SF	11.1	45.93	509.8	13,988	50.3	1634.8	57.67	3.21
	APC	8x4-E	11.1	40.07	444.8	14,875	56.3	1474.2	52.00	3.31
	APC	9x4.5-E	11.1	50.81	564.0	13,250	56.5	1909	67.34	3.39
	MAS	7x4x3	11.1	30.96	343.6	16,325	61.8	1153.5	40.69	3.36
	Prop	Prop	Input	Motor	Watts	Prop	Pitch Speed	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Voltage	Amps	Input	RPM	MPH	Grams	Ounces	Grams/W
	APC	5x4.5-E	14.8	26.24	388.4	23,284	99.2	832.5	29.37	2.14
	APC	5x5-E	14.8	22.50	333.0	23,934	113.3	582.6	20.55	1.75
	APC	6x4-E	14.8	29.92	442.8	22,679	85.9	1127.6	39.77	2.55
	APC	6x5.5-E	14.8	36.23	536.2	21,632	112.7	1061.9	37.46	1.98
	APC	7x4-E	14.8	47.39	701.4	19,743	74.8	1781	62.82	2.54
	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.