Cobra C2203/52 Motor Propeller Data
Motor Wind Motor Kv No-Load Current Motor Resistance I Max P Max (2S)
52-Turn Delta 1540 RPM/Volt Io = 0.36 Amps @ 8v Rm = 0.238 Ohms 7 Amps 55 W
 
Outside Diameter Body Length Total Shaft Length Shaft Diameter Motor Weight
26.8 mm,  1.06 in. 11.4mm,  0.45 in. 19.6 mm,  0.77 in. 3.0 mm,  0.118 in. 17.5 gm,   0.62 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-SF 7.4 4.95 36.6 8,070 30.6 258 9.10 7.04
APC 7x5-SF 7.4 5.60 41.4 7,620 36.1 259 9.14 6.25
APC 7x6-SF 7.4 6.51 48.2 7,040 40.0 244 8.61 5.06
APC 8x3.8-SF 7.4 6.73 49.8 6,830 24.6 324 11.43 6.51
GWS 7x3.5-DD 7.4 3.36 24.9 9,180 30.4 205 7.23 8.24
GWS 8x4-DD 7.4 5.45 40.3 7,700 29.2 305 10.76 7.56
GWS 8x4.3-SF 7.4 6.93 51.3 6,740 27.4 328 11.57 6.40
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.