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Castle 1406 Sensored Motor - 4600KV
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Castle 1406 Sensored Motor - 4600KV

Product #: 060-0056-00

You asked. We listened.

For more than a decade Castle has been providing award winning brushless sensorless motors to R/C enthusiasts worldwide. In response to overwhelming requests by our customers, we have brought technological advancements together that will deliver unprecedented performance in our new SENSORED motor Line.

(Based on 3 vote(s))
1 review(s) | Write a review
USD $84.95 /EA
List Price: USD $103.95 /EA
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  • Minimum Input Voltage : 2S
  • Maximum Input Voltage : 3S
  • Sensored Capable : Yes
  • Recon G6 Certified Motor : No
  • ROAR Certified Motor : Yes
    • EA
  • Availability: This item is out of stock and will ship when available.
Technical Specs
Input Voltage Range: 2-3S LiPo
Kv: 4600
Max. RPM: 100,000
Size: Length: 49.5mm
Diameter: 36mm
Weight (w/wires): 197 g / 6.9oz
Shaft Size: Length: 15mm
Diameter: 1/8" (3.17mm)
Mounting Hole Specifications: M3 @ 25mm
Cooling Fan: Optional - Coming Soon
Connectors: 4mm male Castle Bullet Connectors
Items Needed for Operation: Compatible Electronic Speed Control (ESC)
Application Guidelines: 1:10 scale 2WD SCT, on-road touring, stadium truck and buggies
Recommended ESC(s): Mamba Max Pro, Mamba X
Max. Recommended Vehicle Weight: 2WD SCT Trucks up to 5lbs, stadium trucks, buggies, and on-road vehicles up to 4lbs.
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.

Comparable Turn Count: Click here for 1406 Sensored Motor 2-Pole Turn-Count Equivalent Data Sheet
1406 Motor 2-Pole Equivalent Turn-Count Data Sheet
1406 Sensored Motor Competitive Testing Results
Sensored Motor Quick Start


Drivers in all applications demand clean starts when coming off the line. Crawler fans require high-precision low speed control and torque for climbing, racers need precision and predictability, and dragsters don’t have a millisecond to spare. To achieve all of these performance demands and more, we have integrated rotor position sensor technology with our improved high power and high efficiency motor design. Through the use of our sensors, the position of the rotor is always known by the ESC. This eliminates the possibility of encountering cogging or inconsistency during startup. Users will experience PRECISE throttle control and BUTTERY SMOOTH starts plus the RAW POWER and LONGER RUN TIMES that our highly efficient motors produce.


When tasked with designing a sensored motor our engineers started with the question,

“What makes a motor great?”

  • Efficiency
    • You can push it harder (gear it up)
    • You can run it longer (with the same battery)
    • It stays cool under extreme loads
  • Reliability
    • Ability to withstand the harsh demands of any RC application
    • Long-life, high-quality components
    • Proven manufacturing techniques


The higher the efficiency of a motor the more power it can produce without overheating, which allows you to safely run higher gear ratios. The higher the efficiency of a motor, the less power it takes to produce the same output power, which allows you to run longer on a single charge. The higher the efficiency of the motor, the less energy it turns into heat; keeping it cool under extreme loads. Efficiency equals performance.


Without a robust and reliable design, efficiency will only go so far. RC enthusiasts love pushing their equipment to the edge. The Castle engineers know this and spared no expense when developing a design that could hold up to the harsh conditions that the RC community will throw at it. Oversized NMB bearings and vibration dampening system ensure the longest bearing life possible. High-strength, high-temperature grade neodymium sintered magnets combined with a high-strength Kevlar wrap ensures the integrity of the rotor is not compromised during harsh running conditions. Our proprietary winding techniques allow us to produce a stator assembly that is the lowest possible resistance, resulting in a cooler running motor. A cooler motor has a longer lifetime. Construction of our motor required careful component selection; each verified through internal testing to ensure the highest efficiency possible. In the end, the result is a motor with unmatched quality, performance, and reliability. We wouldn’t put our name on anything less.


  • Our IMPROVED 4-POLE 12-SLOT design boasts exceptional EFFICIENCY and produces LESS HEAT.
  • QUIETSENSE™ technology shields the sensors from magnetic field noise generated from the motor coils and keeps your motor and ESC in sync at all times. Use of a Flux Shield™ in conjunction with secondary Sense Magnets delivers even HIGHER PRECISION and MORE EFFICIENT startups.
  • Our OPTIMIZED design eliminates the need for mechanical timing adjustments. Our sensor alignment method delivers uniform timing and torque in both directions, automatically.
  • REBUILDABLE design allows users to replace front end bell/bearing assembly or rotor/shaft assembly.
  • ROAR standard sensor port and labeled connections.
  • Updated modern and sleek design; looks as cool as it performs.

Immense care is taken by our US design team during every step of the development process. While using the highest quality components is important, design is equally important. Our experienced, in-house engineering team, located in Olathe, Kansas, has spent countless hours simulating and developing the most efficient design. Development includes magnetic simulations, custom winding techniques, and rigorous, real-world testing of the final product.

During a 5-minute constant power dyno test the results were clear. When producing 200W of power, our competitors’ motors increased in temperature over 20% more than the Castle 1406 Sensored motor. When producing 300W of power, it wasn’t even close, their temperature climbed at over twice the rate of the Castle motor and then overheated in around two minutes while the Castle motor powered through and completed the test. _Click here for graph_

* Competitors’ motors is average of several 7.5T 2-pole motors typically used in mod-style racing.

You will reap the benefits of longer run times on one battery and a cooler running motor that can be pushed harder.

We take OVERPOWERING seriously.


Castle engineers always add a little something extra in their designs that takes your performance to the next level. We have not skimped here. Many customers have utilized our industry leading software functionality that Castle Link* offers. When paired with a Castle Creations sensor supported ESC, like the MAMBA MICRO X, MAMBA MAX PRO, MAMBA X or MAMBA MONSTER X, you can unlock advanced tuning capabilities that Castle Link provides specifically for sensored motors.

SMARTSENSE™ uses the motors sensors to start the motor 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. When running, a motor must transition between different load points and a different timing advance is required for optimal efficiency at all load points. Using mechanical timing adjustments alone, you can only target one driving condition, such as higher start power or higher top end speed. This sacrifices performance and efficiency during the other driving phases. Electronic timing in SMARTSENSE™ will advance timing automatically for peak performance during all driving conditions. This allows users to combine the best of both worlds in an unrivaled HYBRID between smooth sensored startups and high-efficiency sensorless drive.

With a Castle sensored ESC and sensored motor you will have the ULTIMATE POWER PLANT for your vehicle. Users will experience PRECISE throttle control, BUTTERY SMOOTH starts, PEAK PERFORMANCE and EFFICIENCY throughout the full throttle range. You will feel the POWER and LONGER RUN TIMES that a WORLD-CLASS motor produces.

It’s not magic… it’s SMARTSENSE™.

During a 5-minute constant power dyno test the results were clear. When producing 200W of power, our competitors’ motors increased in temperature over 20% more than the Castle 1406 Sensored motor. When producing 300W of power, it wasn’t even close, their temperature climbed at over twice the rate of the Castle motor and then overheated in around two minutes while the Castle motor powered through and completed the test.
* Competitors’ motors is average of several 7.5T 2-pole motors typically used in mod-style racing.


Competitive Testing

Thermal performance and power handling are two of the most important aspects of any motor design.  Both of these were key design considerations for the engineering team at Castle during the development of our 1406 Sensored motor line.  Throughout the development process, testing was constantly performed to ensure we were developing the best motor possible.  It is important for us to see how we stack up against our competition to ensure we are providing our customers with the best product.

Near the end of our development, we designed and completed a series of tests that was a direct comparison of thermal performance between our 1406 Sensored motor and a number of competitor’s 2-pole modified 7.5T motors.  The competitor’s motors were chosen because they represent a popular setup that is similar in Kv (or top speed) to the Castle 1406 4600 Sensored motor.

In these tests, we used a motor dynamometer‎ (dyno) in order to simulate two real-world loads that these motors are likely to encounter during a typical run.  We set up the dyno so that it held the output power of the motor at 200W and 300W for the two series of tests we performed.  This means that through a 5-minute test the motor output a constant and equal amount of power.  We did this because we wanted to make sure our test was a fair comparison of real-world loads and was not affected by slight differences in motor Kv or speed under load. 

The temperature of each motor was monitored throughout the test.  Some of the motors tested have better or poorer thermal connection between the internals of the motor and the outside of the motor can.  In order to keep the test fair we monitored the temperature of each motor on the motor coils directly.  The motor coils are a good representation of how close the motor is to actual failure.  In practice, most people measure the outside of the motor can because it is convenient.  Temperatures on the outside of the motor can are always lower than those of the coils, often by more than 60?F (33?C).  In the results you will notice the temperatures are higher than you would expect on the motor can, and this is why. 

After running this test on all of the motor samples, we averaged all of the competitor’s motors together into a single line to compare to the Castle 1406 Sensored motor.

The test results were very definitive.  The graph above shows a constant 200W power output.  This would be representative of a very mildly geared race setup.  As you can see, by the end of the 5-minute test, the competitor’s motor temperature (red line) increased much faster the Castle 1406 Sensored motor (green line).  This means you can run longer without worrying about your motor temperature with the Castle motor.  This also means that the Castle motor is more efficient, losing less power into wasted heat, and using less of your battery’s charge giving you a longer runtime.

What happens when we add a few more teeth to the pinion?  We wanted to find out, so we increased the power output to 300W to simulate a higher geared race setup.  The results were even more dramatic.  The competitor’s motors increased in temperature at over twice the rate of the Castle 1406 Sensored motor.  The competitor’s motors could not even finish the test.  At around 2 minutes into the test, the motors were near their failure temperature (300?F/150?C).  At that point, we had to shut down the test and air out the testing facility.  Meanwhile, the Castle 1406 Sensored motor was able to power through the entire 5-minute test and remained within acceptable temperature limits.

In conclusion, the results of this test are clear.  The Castle 1406 Sensored motor simply out-powers the competition.  The Castle motor will allow you to gear your setup higher without overheating, generate more power for longer, give you more torque when you need it, and extend your battery life.  Another example of Castle taking OVERPOWERING RC seriously.

Average rating:
(Based on 3 vote(s))
Rate this product:
Brian From United States Pennsylvania
January 26, 2020
Brought an old RC10B2 out of storage and upgraded from a 11 turn double brushed motor to the Castle 4600Kv. Paired with the Sidewinder 3 it is awesome with a good 2S pack and way more power than needed with a 3S.
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