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Overview
The E-flite 40-Amp Pro Switch-Mode BEC Brushless ESC (V2) is a high-quality sensorless brushless electronic speed controller designed for RC enthusiasts who demand reliable, efficient performance in their aircraft and electric RC models. This advanced speed controller features an integrated switch-mode BEC (Battery Eliminator Circuit) that eliminates the need for a separate receiver battery, saving valuable weight and reducing system complexity. Whether you're flying RC planes, helicopters, or EDF jets, this ESC delivers the consistent power and smooth throttle response that serious RC flyers expect. The V2 version represents the latest evolution of E-flite's proven Pro Switch-Mode line, incorporating refinements that make it an excellent choice for both experienced pilots and those stepping up from smaller brushless RC setups in the UK market.
This 40-amp continuous current ESC is engineered for aircraft that demand reliable electronic speed control without compromise. With proper cooling and adequate airflow, it can sustain 40 amps of continuous current, making it ideal for mid-to-high-powered electric RC aeroplanes and helicopters. The burst capability of 55 amps for up to 15 seconds provides the extra power needed for aggressive manoeuvres and rapid acceleration, ensuring your brushless RC plane responds instantly to your commands. The robust engineering and thermal management built into this unit make it suitable for both sport flying and more demanding applications.
RC Model Shop stocks the E-flite 40-Amp Pro Switch-Mode BEC Brushless ESC (V2) as part of our comprehensive range of flight ESCs for RC planes and helicopters. We're committed to helping UK RC enthusiasts find the perfect speed controller for their build, whether you're constructing a ready-to-run RC plane or assembling a custom electric aircraft from scratch.
Key Features
- 40 Amps Continuous Current Rating — This ESC safely handles up to 40 amps of continuous current when properly cooled with adequate airflow, making it suitable for a wide range of brushless RC aircraft from sport planes to high-performance helicopters.
- 55 Amps Burst Current Capability — The unit can deliver up to 55 amps of burst current for 15 seconds, providing the extra power you need for aggressive manoeuvres, rapid climbs and dynamic flight performance without thermal stress.
- Integrated 5-Amp Switch-Mode BEC Circuit — The built-in BEC eliminates the need for a separate receiver battery pack, saving weight and reducing wiring complexity in your RC aircraft whilst maintaining a clean 5-amp continuous power supply for servos and receiver systems.
- Stronger BEC for 3-Axis Stabilisation Systems — The robust BEC is specifically engineered to reliably power most 3-axis stabilisation systems (gyros and autopilots), making this ESC ideal for advanced RC helicopters and stabilised RC planes that require consistent, clean power delivery.
- Support for Up to 7 Analogue Servos or 6 Digital Servos — The 5-amp BEC can drive and control multiple servos simultaneously, allowing you to power up to 7 standard-sized analogue servos or up to 6 digital servos directly from the speed controller without an external BEC.
- 3S to 6S LiPo and 9S to 18S NiMH/NiCd Compatibility — This versatile ESC accepts input voltage from 3-cell to 6-cell lithium polymer batteries (9V to 18V) or 9-cell to 18-cell nickel-metal hydride and nickel-cadmium battery packs, making it compatible with most popular RC battery chemistries.
- Finned Heatsink Design — The extended finned heatsink dramatically increases the surface area for heat dissipation, allowing the ESC to run cooler and more efficiently during extended flight sessions, particularly important when running at high throttle settings.
- Programmable Motor Braking — You can enable or disable electronic braking to slow the motor when the throttle returns to neutral, a useful feature for landing aircraft smoothly or for folding propeller applications where you want to prevent windmill effects.
- Safe Power-Arm Mode — This safety feature prevents accidental motor starts by requiring a specific arming sequence before the motor will respond to throttle input, protecting against unintended propeller rotation during setup and maintenance.
- Programmable Low Voltage Cutoff — The ESC includes selectable low voltage cutoff settings optimised for 3-cell LiPo (9V), 4-cell LiPo (12V), 5-cell LiPo (15V), 6-cell LiPo (18V), or 70% of battery starting voltage, preventing over-discharge damage to your expensive battery packs.
- Programmable Throttle Input Range — Fine-tune the throttle response curve by adjusting the input range parameters, allowing you to optimise control feel and responsiveness to match your flying style and aircraft characteristics.
- Programmable Soft Start for Helis and Aeroplanes — Whether you're flying fixed-wing RC planes or helicopters, you can programme the soft start function to gradually ramp up motor power, reducing mechanical shock to the drivetrain and extending component lifespan.
- Automatic Motor Shutdown on Signal Loss — If your RC receiver loses signal from your transmitter, the ESC will automatically shut down the motor as a safety measure, preventing runaway aircraft and potential accidents during flights.
- Sensorless Brushless Design — This ESC operates without motor sensors, simplifying installation and reducing weight whilst maintaining excellent throttle response and reliability for most RC aircraft applications.
- EC3 Connector — The industry-standard EC3 connector provides secure, reliable power connections and is widely compatible with batteries and other equipment in the RC market.
Technical Performance
The E-flite 40-Amp Pro Switch-Mode BEC Brushless ESC (V2) represents a mature, proven design that has been refined through extensive field testing and real-world RC flying experience. With a continuous current rating of 40 amps and burst capability of 55 amps for 15 seconds, this speed controller handles demanding brushless motors used in RC planes, electric helicopters, and high-performance aircraft. The finned aluminium heatsink is engineered to dissipate heat efficiently, and the ESC is designed to work optimally when installed in locations with good airflow—essential for maintaining cool running temperatures during extended flying sessions. The integrated 5-amp switch-mode BEC circuit uses modern switching technology rather than linear regulation, making it significantly more efficient and generating less waste heat than older BEC designs. This efficiency benefit translates to longer flight times and more reliable operation. The ESC's sensorless brushless architecture means you don't need to install additional wiring or sensors in your motor, simplifying the installation process for RC enthusiasts of all skill levels. The unit accepts input from 3S to 6S lithium polymer batteries (9V to 18V) or traditional 9S to 18S nickel-metal hydride and nickel-cadmium packs, giving you flexibility to use whichever battery chemistry suits your RC aircraft and flying needs. Programmable features including soft start, motor braking, throttle range adjustment, and low voltage cutoff customisation mean you can fine-tune the ESC's behaviour to match your specific aircraft type and flying preferences. Whether you're operating a high-speed sport plane, a scale RC helicopter, or a precision aerobatic aircraft, this ESC provides the stable, responsive power delivery expected from a professional-grade brushless speed controller.
What's in the Box
- E-flite 40-Amp Pro Switch-Mode BEC Brushless ESC (V2)
- EC3 connector
What You Need to Complete
- Brushless motor suitable for your RC aircraft
- Battery pack (3S-6S LiPo or 9S-18S NiMH/NiCd)
- RC receiver and transmitter
- Servos for your control surfaces (up to 7 analogue or 6 digital standard-sized servos)
- Propeller appropriate to your aircraft and motor
Frequently Asked Questions
- Is the E-flite 40-Amp Pro Switch-Mode BEC Brushless ESC suitable for beginners learning to fly RC planes? — Yes, this ESC is suitable for beginners who have a solid understanding of RC aircraft systems and are ready to move beyond trainer aircraft. The programmable safety features like soft start and power-arm mode help prevent mistakes, and the comprehensive feature set means you won't outgrow the ESC as your skills improve. However, absolute beginners may find more approachable options in entry-level RTF (ready-to-fly) RC planes that come with simpler pre-configured electronics.
- What battery does this ESC need, and how do I choose the right one? — The E-flite 40-Amp ESC accepts 3S to 6S lithium polymer batteries (meaning 3-cell through 6-cell LiPo packs providing 9V to 18V) or traditional 9S to 18S nickel-metal hydride and nickel-cadmium battery packs. Your choice depends on your motor's power requirements and your aircraft's design. Most modern RC planes use 3S or 4S LiPo batteries for their superior power-to-weight ratio, but always check your motor's recommended voltage range and your airframe's weight limits to ensure safe operation.
- Can this ESC power my RC helicopter gyro and receiver without a separate battery? — Yes, absolutely. The integrated 5-amp switch-mode BEC is specifically engineered with sufficient power and clean regulation to reliably power 3-axis stabilisation systems (gyros and autopilots), making it ideal for RC helicopters. You can run up to 7 standard servos or 6 digital servos from the BEC, covering most helicopter applications and many aircraft configurations.
- What is the difference between the 40-Amp Pro and the 30-Amp Pro models? — The main difference is current handling capacity. The 40-Amp version safely handles continuous currents up to 40 amps with 55-amp burst capability, whilst the 30-Amp model is rated for lower currents. Choose the 40-Amp version if you're flying higher-powered aircraft or larger motors; the 30-Amp model is better suited to lighter aircraft and lower-power applications. Both feature the same advanced control options and reliable BEC performance.
- Does this ESC include programming tools, or do I need to purchase them separately? — The ESC is programmable, but you may need a separate programming card or USB programming device for advanced configuration. Check with RC Model Shop about compatibility with your preferred programming method, as E-flite offers various programming options depending on the ESC version and your requirements.
- How do I install the E-flite 40-Amp ESC in my RC aircraft for best performance? — Mount the ESC in a location with good airflow so the finned heatsink can dissipate heat effectively. Avoid mounting in sealed compartments or against foam fuselage walls. Secure the ESC with foam tape or cable ties to prevent movement during flight, and ensure all connections (battery, motor, and servo connections) are secure and properly insulated from each other.
Why Buy from RC Model Shop?
RC Model Shop is a trusted UK RC retailer and authorised dealer for all the brands we stock, including Traxxas, ARRMA, Losi, FTX, Hobbywing, Spektrum and more. Based in Walsall, we have a physical store where customers are welcome to come in, view products and purchase in store. Whether you are a seasoned competitor, a weekend basher, or just discovering the world of RC for the first time, our team of experienced RC enthusiasts is here to help you find the perfect setup and provide ongoing support. Order the EFL 40-Amp Pro Switch-Mode BEC Brushless ESC (V2) P-EFLA1040B today with confidence, knowing you are buying from an authorised retailer with genuine products, expert knowledge and a commitment to customer satisfaction. Shop online or visit us in Walsall — we look forward to helping you get the most out of your RC experience.
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