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Cobra 8

Product #: 010-0172-03

USD $329.95 /EA
List Price: USD $403.95 /EA
  • Waterproof : Yes
  • Telemetry Capable : No
  • Data Logging : Yes
  • Auxiliary Wire : Yes
  • Minimum Input Voltage : 2S
  • Maximum Input Voltage : 6S
  • Sensored Capable : Yes
  • Recon G6 Certified ESC : No
  • ROAR Certified ESC : No
  • CRYO-DRIVE : Yes
  • B-Link Compatible : No
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  • Availability: This item is in stock.

 We're thrilled to introduce the Cobra 8, our next generation electronic speed controller (ESC) for surface applications. As the inaugural product in a new line, the Cobra 8 is engineered with cutting-edge technology tailored specifically for 1:8th scale vehicles weighing up to 15 lbs. 

The Cobra 8 boasts a state-of-the-art 32-bit, dual-core processor, ushering in a new era of precision and performance. Its enhanced data logging capabilities offer extended recording times, faster sampling rates, and a wealth of data points, enabling users to delve deeper into their vehicle's performance than ever before.

Crafted with a CNC aluminum bottom case, the Cobra 8 is engineered to endure the most rigorous conditions, ensuring reliability in every race or off-road adventure.

One of its defining features is our acclaimed CRYO-DRIVE™ technology, engineered to reduce operational temperatures, significantly prolonging the ESC's lifespan. Moreover, equipped with an impressive 8-amp BEC, the Cobra 8 can effortlessly power the most demanding servos, making it an indispensable ally in your high-performance setup.

We’ve packaged the Cobra 8 with three different Castle 4 -POLE 12-SLOT motor options to overpower a wide range of 1:8th scale vehicles, this combo includes a Castle 1515-2200Kv Sensored Motor. The 1515-2200KV combo is incredible in monster trucks with up to 6S LiPo packs (4S LiPo is the sweet spot), and works great in1:8 scale buggies, truggies and on-road vehicles as well as 1:10 scale monstertrucks weighing up to 15 lbs.


  • 32-Bit Processing power for smoother motor control and improved response time.
  • Enhanced Data Logging includes:
    • Double the maximum sample frequency of older generations.
    • 8x increased logging time of older generations.
    • Data point for ESC electrical motor timing.
    • Data point for acceleration via onboard accelerometer.
    • Looping feature prevents interruptions in data log recording.
    • Ability to download specific sessions.
  • Additional tuning features include:
    • Improved braking adjustability
    • Separate brake and reverse curves
    • Highly adjustable internal BEC. (5.0V - 8.0V adjustable in 0.1V increments)
  • Access to tuning options and firmware updates for free with Castle Link V4 USB programmer included with purchase. Now with USB-C connector! (Requires Windows 10 or higher)
  • Mounting holes located in bottom of aluminum case for installation into vehicle.

  • Input Voltage Range 6.0v - 25.2v (2s - 6s LiPo)
  • SmartSense™, Sensored Only and Brushed Motor Operation Modes
  • Powerful Integrated 8A Peak Adjustable BEC (5.00V - 8.0V)
  • CRYO-DRIVE™ Technology minimizes the amount of time the ESC’s electrical components spend generating heat, resulting in improved thermal performance during partial throttle operation where the majority of driving occurs
  • ESC is housed in a rugged CNC aluminum case and potted in waterproof epoxy to  protect the electronics and promote efficient heat transfer
  • Premium forged heatsink with elliptical fins for superior air flow and increased heat dissipation
  • Oversized factory equipped thermally controlled 30mm cooling fan
  • Waterproof design for all weather conditions
  • Data logging capability to capture and record performance data from your vehicle
  • Auxiliary wire functionality for "on-the-fly" adjustments using your transmitter
  • Audible alerts for easy diagnosis of common issues such as motor-over-temperature and low-voltage cutoff
  • Convenient transmitter programming for six common adjustable settings including cutoff voltage and drag brake
  • Includes Castle Link V4 USB adapter for Windows.
  • Cobra 8 is proudly designed and manufactured in Olathe, KS USA and backed by Castle Creations' 1-year warranty


  • 4-POLE 12-SLOT sensored design that boasts exceptional efficiency and produces less heat
  • Proprietary stator winding produces low internal resistance for a cooler running motor
  • Dual sensor ports to ensure optimal installation in your large-scale vehicle
  • Oversized NMB bearings and vibration dampening system ensure the longest possible bearing life
  • High-strength, high-temperature grade neodymium sintered magnets combined with high-strength Kevlar wrap ensures the integrity of the rotor is not compromised during harsh running conditions and high RPMs

COBRA 8 / 1515-2200kv V2 COMBO COMES WITH:

  • Cobra 8 ESC
  • 1515-2200kv V2 Sensored Brushless motor
  • Castle Link V4 USB Adapter
  • 300mm Direct Connect Sensor Wire
  • Cobra Decals
  • ESC Quick Start Guide

Cobra User Guide
Cobra Quick Start
 Motor Quick Start
Transmitter Programming Audible Alert Reference Chart
ESC Calibration 1:8 scale ESC Comparison  ESC Mounting template

Media Content
Innovation RC
James McCoy

Technical Specs
Input Voltage Range: MIN: 2s LiPo
MAX:  6s LiPo (25.2V)
BEC Specifications: 5.0V - 8.0V adjustable in 0.1V increments; (8A Peak); default 5.5V
Operating Environment: Waterproof* design allows for use in nearly any environment.
 Running Modes:  SmartSense Brushless, Sensored Only, Brushed
Brake: Proportional
Reversible: Yes, but may be disabled for racing.
On/Off Switch: Yes, waterproof
Cooling Fan: Yes, factory equipped (30MM),** temperature controlled
Size: 60mm x 52mm x 43mm (2.36" x 2.04" x 1.69") 
Weight (with no battery connector): 5.84 oz. ( 165.6 grams)
Connectors: 6.5mm female bullets for motor connection, matching 6.5mm male bullets included with motor.
Items Needed for Operation: A high current connector designed for high-powered electric systems, rated for 120+ amps, such as Castle CC Bullet 6.5mm, CC Bullet 8.0mm, or 6.5mm Polarized Castle Connectors, soldered to the battery leads.
Product Use Statements: *Although the Cobra 8 ESC and Castle brushless motors are waterproof, they are not intended for operation while completely submerged in liquid. They can corrode when exposed to corrosive materials, such as salt water. Always rinse the ESC and motor with clean water after exposure to corrosives or dirt. While the motor and controller may be waterproof, we suggest users confirm that the rest of their vehicle, including the batteries, servos, radio and chassis are also waterproof before exposing them to liquids of any kind.

**The cooling fan must be removed prior to driving in wet conditions. It is not waterproof.
Application Guidelines:  Ideal for 1:8 scale buggies, truggies, on-road vehicles and 1:10 scale monster trucks up to 15lbs.
Not recommended for use in high speed 1/8th and larger applications 
(IE Arrma Infraction and Limitless, Traxxas XO-1)

Fully programmable Castle feature set using the included FREE Castle Link USB adapter and freely downloadable NEW Castle Link 2 Windows™ software.
Castle Link Mobile App: 
Not compatible at this time. 
Telemetry Link Capable:
Not Supported

Motor Specs
Input Voltage Range: 2S-6S LiPo
Kv: 2200
Max. RPM: 60,000
Size: Length: 75.4mm
Diameter: 40mm (41.4mm with fins)
Weight (w/wires): 426g (15.1oz) ; 380g without wires
Shaft Size: Length: 20mm
Diameter: 5mm
Mounting Hole Specifications: M3 and M4 @ 25mm
Cooling Fan: Optional
Connectors: 6.5mm male connectors on 10-gauge wire
Application Guidelines:
Ideal for 1:8 scale buggies, truggies, on-road vehicles and 1:10 scale monster trucks up to 15lbs.
Not recommended for use in high speed 1/8th and larger applications 
(IE Arrma Infraction and Limitless, Traxxas XO-1)
Tech Notes: 

Running modes: SMARTSENSE™, Sensored, Sensorless with Castle sensored capable ESCs.

Water Resistant Design: The sensor board is coated with silicone conformal coating to protect the sensors from moisture. The sensor connections are not water resistant; water can cause signal loss which could result in loss of sensored capabilities. Castle recommended applying dielectric grease to the outside of the sensor wire connections after installation of the wire. Routine maintenance is recommended after running in wet conditions. Please refer to this document for running and maintaining motors in wet environments.

For support, frequently asked questions, technical documents, and more, visit our support site.

Castle Creations, Inc. warrants this product to be free from manufacturing defects for a period of one year from date of purchase.

This is a high power product with the potential to be very dangerous. Please read the safety information before use. This product may contain chemicals known to the State of California to cause cancer and or birth defects or other reproductive harm.

U.S. Patent # 7400103, 7492122, 7579796, 7740516, 8287328, 8678875, and 8905814 B2 - Other patents pending.

Controller designed, and circuit boards manufactured in Olathe, KS. USA
Controller assembled in Olathe, KS. USA

Motor designed in Olathe, KS. USA
Motor made in China. 

      Product Features
        Castle’s newest software technology, CRYO-DRIVE™ minimizes the amount of time the ESC's electrical components spend generating heat by optimally controlling which components are being used while driving the motor. This is happening thousands of times per second, which greatly reduces the rate at which the ESC heats up.  This results in significantly improved thermal performance during partial throttle operation where the majority of driving occurs. Your setup will be able to handle higher gear ratios, in heavier vehicles, with longer runs.

      When paired with a Castle 4-POLE 12-SLOT SENSORED MOTOR SmartSense™ software, enabled by default in the Castle Link Programming Suite, will use the motor’s sensors to provide smooth starts, excellent torque, and low-speed drivability.  Once the motor is turning, it seamlessly transitions to Castle’s ULTRA-EFFICIENT sensorless mode with electric timing. Smooth sensored startups and high-efficiency sensorless running makes the COBRA 8 system produce more power and less heat. QUIETSENSE™ is an innovative advancement in the design of sensored motors to deliver the highest precision and most efficient startup.

      The COBRA 8 allows “on-the-fly” adjustments to be made through the AUX wire once enabled in Castle Link. Once you have selected an AUX wire function, that setting can then be tuned from your transmitter while driving. Torque control, max throttle, max brake and drag brake adjustments are a sampling of the available modes. This real-time tuning allows you to quickly and easily fine-tune your system. . Click here for additional information.


      • Double the maximum sample frequency of older generations.
      • 8x increased logging time of older generations.
      • Data point for ESC electrical motor timing.
      • Data point for acceleration via onboard accelerometer.
      • Looping feature prevents interruptions in data log recording.

      You can view a detailed turn-by-turn record of what your ESC actually experienced during the run. You will be able to record real-time data such as motor RPM, battery current and voltage, ESC and motor temperature, throttle input, and more. Download and analyze the collected data via Castle Link and make adjustments to maximize both performance and battery life.

      For over 25 years Castle engineers have been setting the bar for industry leading software functionality. The Castle Link Programming Suite is your ticket to creating the perfect setup. To gain access to the host of tuning parameters download the BRAND NEW  simple to install software from our website and you are ready to personalize your controller's settings. Requires Windows 10 or higher.

      The COBRA 8 is housed in a rugged CNC-machined aluminum case and then potted in waterproof epoxy. This not only protects the electronics but ensures any heat generated in the controller can easily be dissipated through the case.
      COBRA 8 features Audible Alerts that will notify you, via audible chimes, of possible issues with calibrations and error conditions to help diagnose problems. 

      The COBRA 8 is proudly designed and manufactured in Olathe, Kansas USA and is backed by Castle Creations’ 1-year warranty and unparalleled "make-it-right" customer support. Call us, email us, or walk in our front door – we’re here to help. Click here for additional information about our Tier 1 and Tier II warranty.


      Optional Accessories
      Direct Connect Sensor Wire
      Castle Link Quick Connect (or Quick Connect Duo)
      Quick Field Programmer, Surface Version
      6.5mm Polarized Connectors-Male/Female Single Pk
      6.5mm Polarized Connectors-Male Multi-Pack
      Polarized Castle Connectors - 6.5mm Female Multi-Pack
      CC BULLET 6.5MM
      6.5mm Male/Female Connector Set (3ea)
      CC BULLET 8.0MM
      8.0mm Male/Female Connector Set (3ea)
      CC BEC 2.0 15A Max Ouput, 14S (58.8 Volts), Waterproof
      Castle Capacitor Pack, 8S MAX (35V)

      Service Parts
      TBD TBD                                            
       TBD TBD
       TBD TBD


      COBRA 8 FAQ'S: 

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