Cobra C2820/12 Motor Propeller Data
	Motor Wind		Motor Kv		No-Load Current		Motor Resistance		I Max	P Max (3S)
	12-Turn Delta		970 RPM/Volt		Io = 1.30 Amps @ 10v		Rm = 0.039 Ohms		40 Amps	440 W
	Outside Diameter		Body Length		Total Shaft Length		Shaft Diameter		Motor Weight
	35.0 mm,  1.38 in.		40.0 mm,  1.57 in.		60.0 mm,  2.36 in.		5.00 mm,  0.197 in.		138 gm,   4.87 oz
	Prop	Prop	Input	Motor	Watts	Prop	Pitch	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Voltage	Amps	Input	RPM	Speed	Grams	Ounces	Grams/W
	APC	8x8-E	11.1	20.58	228.5	9,352	70.8	774	27.30	3.39
	APC	9x6-E	11.1	17.02	188.9	9,617	54.6	984	34.71	5.21
	APC	9x7.5-E	11.1	25.32	281.0	8,998	63.9	1054	37.18	3.75
	APC	9x9-E	11.1	29.14	323.4	8,667	73.9	1031	36.37	3.19
	APC	10x5-E	11.1	20.77	230.5	9,344	44.2	1253	44.20	5.44
	APC	10x6-E	11.1	22.43	249.0	9,206	52.3	1321	46.60	5.30
	APC	10x7-E	11.1	25.95	288.0	8,957	59.4	1415	49.91	4.91
	APC	10x10-E	11.1	36.14	401.2	8,157	77.2	1225	43.21	3.05
	APC	11x5.5-E	11.1	27.94	310.1	8,803	45.8	1652	58.27	5.33
	APC	11x7-E	11.1	32.67	362.6	8,442	56.0	1725	60.85	4.76
	APC	11x8-E	11.1	34.98	388.2	8,267	62.6	1666	58.77	4.29
	APC	11x8.5-E	11.1	37.37	414.8	8,072	65.0	1655	58.38	3.99
	APC	11x10-E	11.1	42.62	473.1	7,663	72.6	1446	51.01	3.06
	APC	12x6-E	11.1	34.82	386.5	8,210	46.6	1952	68.85	5.05
	APC	13x4-E	11.1	28.58	317.3	8,743	33.1	1905	67.20	6.00
	APC	13x6.5-E	11.1	45.09	500.5	7,456	45.9	2239	78.98	4.47
	Prop	Prop	Input	Motor	Watts	Prop	Pitch	Thrust	Thrust	Thrust Eff.
	Manf.	Size	Voltage	Amps	Input	RPM	Speed	Grams	Ounces	Grams/W
	APC	7x6-E	14.8	14.93	221.0	13,284	75.5	902	31.82	4.08
	APC	8x4-E	14.8	16.84	249.2	13,105	49.6	1142	40.28	4.58
	APC	8x6-E	14.8	26.56	393.0	12,317	70.0	1341	47.30	3.41
	APC	8x8-E	14.8	34.08	504.4	11,695	88.6	1217	42.93	2.41
	APC	9x4.5-E	14.8	24.49	362.5	12,476	53.2	1652	58.27	4.56
	APC	9x6-E	14.8	27.99	414.3	12,126	68.9	1607	56.68	3.88
	APC	9x7.5-E	14.8	41.23	610.1	11,063	78.6	1621	57.18	2.66
	APC	9x9-E	14.8	45.22	669.3	10,671	90.9	1608	56.72	2.40
	APC	10x5-E	14.8	34.29	507.5	11,658	55.2	1969	69.45	3.88
	APC	10x6-E	14.8	36.42	539.0	11,488	65.3	2110	74.43	3.91
	APC	10x7-E	14.8	40.60	600.9	11,029	73.1	2193	77.36	3.65
	APC	11x5.5-E	14.8	44.68	661.3	10,749	56.0	2576	90.86	3.90
	APC	13x4-E	14.8	43.73	647.2	10,762	40.8	2932	103.42	4.53
	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	18.5	17.01	314.7	16,648	63.1	1229	43.35	3.91
	APC	7x5-E	18.5	21.71	401.5	16,201	76.7	1251	44.13	3.12
	APC	7x6-E	18.5	22.60	418.1	16,115	91.6	1346	47.48	3.22
	APC	8x4-E	18.5	26.19	484.4	15,781	59.8	1696	59.82	3.50
	APC	8x6-E	18.5	41.46	767.0	14,396	81.8	1868	65.89	2.44
	APC	8x8-E	18.5	50.28	930.2	13,443	101.8	1645	58.03	1.77
	APC	9x4.5-E	18.5	36.66	678.2	14,819	63.1	2445	86.24	3.60
	APC	9x6-E	18.5	41.55	768.7	14,284	81.2	2234	78.80	2.91
	APC	10x5-E	18.5	49.62	918.0	13,476	63.8	2640	93.12	2.88
	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.