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⚠️ ⚠️ WARNING: THIS IS AN EXTREMELY POWERFUL BRUSHLESS MOTOR SYSTEM. WE STRONGLY
RECOMMEND REMOVING THE PINION GEAR FROM THE MOTOR FOR YOUR OWN SAFETY AND THE
SAFETY OF THOSE AROUND YOU BEFORE PERFORMING CALIBRATION AND PROGRAMMING
FUNCTIONS. Please keep your hands, hair, feet, pets, fuzzy purple shorts, and garden gnomes clear
from the gear train, axle shafts, wheels, and tires of an armed high-performance system
⚠️ ⚠️ WARNING: DO NOT HOLD THE VEHICLE IN THE AIR AND RUN IT UP TO FULL THROTTLE. Rubber
tires will "grow" to extreme size in a high-speed vehicle. Tire failures at speed can cause serious injury!
Make sure your tires are securely glued to the wheels and check them often.
⚠️ ⚠️ WARNING: ALWAYS DISCONNECT THE BATTERY FROM THE ESC WHEN YOU ARE FINISHED
ENJOYING YOUR VEHICLE. The switch on the ESC controls the power that is delivered to the receiver
and servo(s). The controller will always draw current when it is connected to the battery and will
completely discharge batteries if they are connected for long durations. This may cause failure of your
batteries. Castle Creations is not responsible for any damage as a result of batteries left plugged in to
your ESC. Your Castle ESC is programmed to sound a tone every ten seconds to remind you that it is
still powered.
THE COBRA 5 ESC IS NOT INTENDED FOR DRAG RACING OR HIGH-SPEED APPLICATIONS. USE OF THE
ESC IN SUCH APPLICATIONS WILL VOID THE PRODUCT WARRANTY AND WILL NOT BE COVERED.
PLEASE READ THIS GUIDE COMPLETELY TO
GET THE MOST FROM YOUR CASTLE ESC.
© CASTLE CREATIONS 2025
PAGE | 1
DOC031125-1 Cobra 5 DEG.docx
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Summary of Contents for Castle Creations COBRA 5
- Page 1 This may cause failure of your batteries. Castle Creations is not responsible for any damage as a result of batteries left plugged in to your ESC. Your Castle ESC is programmed to sound a tone every ten seconds to remind you that it is still powered.
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Page 2: Table Of Contents
TUNING WITH CASTLE LINK™ ...................... 9 TRANSMITTER PROGRAMMING ....................10 TROUBLESHOOTING ......................... 12 CASTLE TECHNICAL SUPPORT ....................13 WARRANTY INFO ........................13 TRANSMITTER PROGRAMMING REFERENCE ................14 AUDIBLE ALERT REFERENCE..................... 14 © CASTLE CREATIONS 2025 PAGE | 2 DOC031125-1 Cobra 5 DEG.docx... -
Page 3: Getting Started
(-) connects to negative (-) when you plug in your battery! If reverse polarity is applied to your ESC from the battery, it WILL damage your ESC. This will not be covered under warranty © CASTLE CREATIONS 2025 PAGE | 3 DOC031125-1 Cobra 5 DEG.docx... -
Page 4: Motor Wiring
Connect the three wires coming from the motor to the ESC’s motor connections in any order. If you are using a motor other than a Castle Creations motor, you may need to either solder the included bullet plugs to your motor or solder the ESC wires directly to the motor wires. -
Page 5: Radio Connection
The AUX wire function is programmable via Castle Link. This must be plugged into the receiver to obtain the full 20-amp peak capability of the Cobra 5’s BEC. Castle ESC receiver plugs are designed to work with any current receiver, but you will need to make sure the polarity is correct when connected to the receiver. - Page 6 See “Motor Wiring” sections. Closely monitor your ESC and motor temperatures during the first run to ensure they stay within the safe operating limits. © CASTLE CREATIONS 2025 PAGE | 6 DOC031125-1 Cobra 5 DEG.docx...
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Page 7: Audible Alerts
AUDIBLE ALERTS The Cobra 5 provides you with audible alerts that notify you of various issues and error conditions to help you diagnose problems in your setup. These alerts only occur when the vehicle is stopped, and the ESC is in neutral. They repeat every five seconds until the ESC’s power is cycled. -
Page 8: Data Logging
*Only available when using a sensored motor with the sensor wiring connected. DATA LOGGING The Cobra 5 can measure and record important power system information during your race, turn-by- turn. After your run, you can download and analyze this log using Castle Link. You will be able to inspect many parameters including battery voltage, motor RPM, ESC temperature, motor temperature*, ESC timing, Acceleration, and more. -
Page 9: Tuning With Castle Link
Disconnect the RX (Orange/Red/Brown) wire from your receiver and connect it to the Castle Link USB adapter. Castle ESCs may also be programmed using your transmitter and receiver (see Transmitter Programming) © CASTLE CREATIONS 2025 PAGE | 9 DOC031125-1 Cobra 5 DEG.docx... -
Page 10: Transmitter Programming
2 beeps followed by 2 beeps. This means the ESC is still at setting 2 but is now asking if you would like to accept option 2 (None). © CASTLE CREATIONS 2025 PAGE | 10 DOC031125-1 Cobra 5 DEG.docx... - Page 11 3. Brake Amount - Sets what percentage of available braking power is applied with full brake. Option 1: 25% Power Option 2: 50% Power (Default) Option 3: 75% Power Option 4: 100% Power © CASTLE CREATIONS 2025 PAGE | 11 DOC031125-1 Cobra 5 DEG.docx...
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Page 12: Troubleshooting
If you’re still having difficulties with your Castle ESC after trying the suggestions offered here, please contact Castle Creations technical support at the email or phone number listed in the next section. Problem: My Castle ESC may or may not arm, but it will not calibrate to my transmitter. -
Page 13: Castle Technical Support
CASTLE TECHNICAL SUPPORT You may contact our world-class technical support department via e-mail anytime, or by phone. Please visit Castle Creations’ website for technical support hours or view our Product Support/Technical Support self-help options by clicking the click below. Website: https://home.castlecreations.com/tech-support... -
Page 14: Transmitter Programming Reference
* Not available on all Cobra Series ESC models. See the Quick Start Guide for clarification. ** Only available if enabled and using a sensored motor with sensor wiring connected. © CASTLE CREATIONS 2025 PAGE | 14 DOC031125-1 Cobra 5 DEG.docx...
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