Castle Creations Cobra 5 ESC & 1721 1260KV Motor Combo
Castle Creations Cobra 5 ESC & 1721 1260KV Motor Combo
Low stock
Couldn't load pickup availability
The Cobra 5 & 1721 1260KV Combo is built for drivers who want the perfect balance between raw torque and blistering speed. The Cobra 5 ESC ensures smooth, programmable throttle response and superior thermal control, while the Castle 1721 1260KV motor delivers explosive acceleration and consistent power for 1/5- and 1/7-scale RC applications up to 8S LiPo. An excellent upgrade for the Traxxas® X-Maxx™, Traxxas® XRT™, and Redcat Vigilante™, delivering smooth low-end control while maintaining full power, punch, and top speed.
📦 What’s Included
- Cobra 5 ESC
- Castle 1721 1260KV Sensored Motor
- 300 mm direct-connect sensor wire
- Castle Link V4 USB adapter
- Cobra series decals
- Cobra Quick Start Guide
🔥Features
The Cobra 5 ESC combines advanced hardware and intelligent software to deliver dependable, high-efficiency power for demanding RC setups.
Sharing the same footprint as the Mamba XLX2, it features an upgraded current-sensing and thermal-management system that enhances reliability under extreme loads.
New tuning controls let drivers fine-tune brake curves and reverse behavior to prevent drivetrain stress, reduce gear wear, and create smoother throttle transitions.
With its next-gen control algorithm, the Cobra 5 provides a more consistent and predictable driving experience, even under high traction or aggressive acceleration.
The ESC’s improved data-logging system records at twice the sample rate of previous Castle Creations models. You’ll gain deeper insight into performance through expanded data points such as motor timing, acceleration from the onboard accelerometer, and more - all viewable in real time or after a run.
This allows precision tuning to improve traction, detect slippage, and optimize motor efficiency.
All tuning, data logging, and firmware updates are available free of charge using the Castle Link V4 USB Adapter (included) and Castle Link 2 software. Optional B-Link 2 Bluetooth Interface enables smartphone-based programming via the free Castle Link 2 app for Android and iOS.
Additional Features
- CRYO-DRIVE™ Technology: minimizes heat generation by optimizing switching efficiency during partial-throttle use.
- CNC Aluminum Case: rugged, precision-machined housing potted in waterproof epoxy for maximum durability and heat transfer.
- Premium Forged Heatsink: elliptical fin design increases airflow and cooling efficiency.
- 50 mm Factory-Installed Fan: thermally controlled, high-output fan ensures consistent operating temperatures.
- Waterproof Design: built to perform in all-weather conditions (not for full submersion).
- Auxiliary Wire Support: allows “on-the-fly” adjustments from your transmitter.
- Audible Alerts: beeps help diagnose common issues like over-temperature or low-voltage cutoff.
- Quick Transmitter Programming: adjust six key parameters directly from your radio, including cutoff voltage and drag brake.
- Warranty: 12 months (see the NOTE below).
⚙️Technical Specifications
CONTROLLER
| Category | Details |
|---|---|
| Input Voltage Range | 3S - 8S LiPo (11.1 V – 33.6 V) |
| BEC Specifications | 5.5 V - 8.5 V adjustable in 0.1 V increments (20 A peak), default 5.5 V |
| Application Guidelines | Designed for 1/7 and 1/5 scale RC vehicles. Not for drag racing or speed-run applications. Misuse outside intended operation may cause damage and is not covered under warranty. |
| Running Modes | SmartSense™ and Sensorless Brushless |
| Reversible | Yes - may be disabled for racing |
| On/Off Switch | Yes - Waterproof |
| Cooling Fan | Factory equipped 50 mm, temperature controlled |
| Dimensions (L × W × H) | 3.98" × 2.49" × 2.35" (101.2 mm × 63.3 mm × 59.5 mm) |
| Weight (with wires) | 13.2 oz (374 g) |
| Connectors | 8.0 mm female bullets (for motor connection); matching male required |
| Required Connectors | Use high-current connectors rated 150 A or higher, such as Castle CC Bullet 8.0 mm, 6.5 mm Polarized Connectors, QS8 Anti-Spark, or QS10 10 mm Anti-Spark |
| Recommended Batteries | Tested with GensAce 10,000 mAh & 6,800 mAh 100C; Onyx 6,400 mAh - 8,000 mAh D5 / 100C; SMC 9,500 mAh - 8,600 mAh 150C; SMC 10,600 mAh - 8,600 mAh 250C |
| Recommended Motors | Castle 2028-800KV, 2028-1100KV, 1721-1260KV |
| Installation | Mounting holes located on bottom aluminum case for direct chassis fitment |
| Programmability | Fully programmable via Castle Link V4 USB Adapter (included) and Castle Link 2 software (PC or Mac). Optional Bluetooth control available through B-Link 2 module and Castle Link 2 mobile app. |
| Operating Environment | Water-resistant, not for full submersion. Always rinse after mud or salt exposure. Ensure motor, battery, and servo components are kept dry. The cooling fan must be removed prior to driving in wet conditions since it is not waterproof. |
MOTOR
| Category | Details |
|---|---|
| Input Voltage Range | Up to 10S LiPo (8S max with Cobra 5 ESC) |
| KV Rating | 1260 KV |
| Maximum RPM | 45,000 RPM |
| Motor Size | Length – 101.2 mm • Diameter – 47.6 mm |
| Shaft Size | Length – 22 mm • Diameter – 8 mm |
| Weight (with wires) | 27.36 oz / 1.71 lbs (776 g) |
| Mounting Hole Pattern | M3 and M4 holes on 25.4 mm spacing |
| Connectors | 8.0 mm male bullets + 250 mm sensor wire |
| Items Required for Operation | None — fully ready to install |
| Application Guidelines | Designed for 1/7-scale vehicles up to 25 lbs (11.3 kg) and 8S LiPo operation |
| Maximum Recommended Vehicle Weight | 25 lbs (11.3 kg) |
🧠 Technical Notes
- Perform maintenance after operation in wet or muddy conditions to extend motor life.
- Carefully monitor motor temperature - never allow it to exceed 200°F (93°C).
- Use mounting screws no longer than 5 mm into the motor housing to avoid internal winding damage (improper screws are not covered by warranty).
IMPORTANT NOTE:
The Castle Cobra 5 is designed for general 1/5 and 1/7 scale RC use and not for drag racing or speed-running. Using the ESC in these conditions will void the warranty.
For extreme drag or speed-run setups, the Ghost RC Cobra 5 ACE ESC is recommended; however, because of the inherently high-stress nature of such applications, it is sold without warranty.
Share
