Overview
The Spektrum SPM 2840-1900Kv Brushless Outrunner Motor (Model M-SPMXAM3900) is a high-performance brushless electric motor designed for RC aircraft and multi-rotor applications. This 14-pole outrunner motor delivers impressive power characteristics with a KV rating of 1900, making it suitable for a wide range of RC enthusiasts looking to upgrade or build their next aerial platform. Whether you're searching for a reliable brushless RC motor in the UK or seeking to enhance your existing RC setup, this Spektrum motor represents a trusted choice from one of the industry's most recognised manufacturers. The motor's outrunner design means the outer bell rotates around a stationary core, providing efficient power delivery and excellent torque characteristics that make it ideal for both sport flying and leisurely cruising applications.
Spektrum is renowned for manufacturing precision-engineered RC components, and this brushless motor exemplifies their commitment to quality and reliability. The 14-pole configuration strikes an excellent balance between power and efficiency, making it suitable for medium-powered RC aircraft applications. If you're building a custom RC plane, quadcopter, or multirotor platform in the UK, this motor offers the performance and dependability that serious hobbyists demand. The compact yet robust construction means it integrates well into various airframe designs without adding unnecessary weight or bulk to your RC model.
This brushless outrunner motor is perfect for RC builders who understand the importance of quality components. Unlike brushed motors that require regular maintenance and eventually wear out, brushless motors like the SPM 2840-1900Kv offer superior longevity, efficiency, and consistent performance across extended flight sessions. With its reputation for reliability, this Spektrum motor is an excellent choice whether you're a weekend flyer or someone serious about getting the best performance from your RC aircraft.
Key Features
- Brushless Outrunner Design — The brushless technology eliminates carbon brush wear and maintenance, providing longer operational life and more consistent performance throughout your RC flying sessions compared to traditional brushed alternatives. Outrunner configuration means the rotating bell generates excellent torque characteristics ideal for aerial applications.
- 1900 KV Rating — This KV specification determines the motor's RPM per volt, meaning at 1 volt the motor will turn approximately 1900 revolutions per minute. This mid-range KV makes the motor versatile for various aircraft weights and configurations, balancing speed with power delivery for stable, controllable flight characteristics.
- 14-Pole Motor Construction — The 14-pole configuration provides smoother power delivery and better efficiency compared to lower-pole-count motors, whilst reducing vibration and noise during operation. This results in more refined flight characteristics and improved overall performance in your RC aircraft or multirotor platform.
- Spektrum Quality Engineering — As a Spektrum product, this motor benefits from rigorous quality control and precision manufacturing standards. Spektrum's reputation for reliability means you can trust this motor to perform consistently in demanding RC applications across all seasons and conditions in the UK.
- Compact Form Factor — The motor's efficient design minimises weight whilst maximising performance, critical considerations for any RC aircraft builder. This allows you to allocate weight budget to batteries, payloads, or additional flight systems rather than excessive motor mass.
- Wide Compatibility Range — The motor's specifications make it compatible with standard RC batteries and ESC (Electronic Speed Controller) setups commonly used in the RC hobby, ensuring easy integration into existing or new RC builds.
Technical Performance
The Spektrum SPM 2840-1900Kv Brushless Outrunner Motor delivers impressive technical performance characteristics that make it suitable for diverse RC aircraft applications. The 1900 KV rating provides an optimal balance between speed and torque, allowing builders to design platforms ranging from high-speed racing aircraft to stable, precision-flying models. The brushless outrunner construction ensures minimal electromagnetic interference, clean power delivery, and excellent efficiency across the entire throttle range. The 14-pole design is a proven configuration in the RC industry, offering superior smoothness compared to lower-pole alternatives whilst maintaining reliable commutation and consistent RPM regardless of load variations. The motor's engineering allows it to work effectively with standard 2S to 4S LiPo batteries commonly found in RC hobbyist setups, though exact voltage compatibility should be confirmed with your chosen ESC pairing. As a Spektrum product manufactured to strict quality standards, this motor exhibits excellent build quality with precision-wound stator coils and a robust bell structure designed to withstand the rigours of regular RC flying. The outrunner design generates excellent cooling characteristics due to airflow across the rotating bell, preventing thermal issues during extended flight sessions. Whether you're building a park flyer, intermediate RC aeroplane, or multirotor platform, this motor delivers the reliable performance that distinguishes professional-grade RC components from budget alternatives available in the UK market.
What's in the Box
- Spektrum SPM 2840-1900Kv Brushless Outrunner Motor (M-SPMXAM3900)
What You Need to Complete
- Electronic Speed Controller (ESC) rated for your chosen battery configuration
- LiPo, LiIon, or LiFe battery pack (2S to 4S recommended based on application)
- RC aircraft airframe or multirotor platform compatible with the motor specifications
- RC radio system and receiver
- Appropriate motor mount hardware for your specific aircraft design
- Propeller sized appropriately for the motor KV and aircraft specifications
Frequently Asked Questions
- What does 1900KV mean on this brushless RC motor? — The KV rating (1900 in this case) indicates the motor's speed constant, specifically the number of revolutions per minute the motor will turn for every 1 volt of electrical potential applied. So with a 2S LiPo battery (7.4V), this motor would theoretically spin at approximately 14,060 RPM under no load. This mid-range KV makes it versatile for various RC aircraft applications, balancing speed with torque.
- Is this motor suitable for beginners building their first RC aircraft? — This motor is appropriate for intermediate RC builders who have experience selecting ESCs, batteries, and propellers to match motor specifications. Beginners should seek guidance from experienced RC hobbyists or shop staff to ensure the motor is paired with correctly-sized components for their specific aircraft project. Ready-to-fly RC models are better suited for those completely new to the hobby.
- What battery does the Spektrum SPM 2840-1900Kv motor need? — This motor works with LiPo, LiIon, and LiFe battery packs in the 2S to 4S range, though your specific battery choice depends on your aircraft weight, desired flight characteristics, and the ESC you select to power the motor. You must pair this motor with an appropriately rated ESC that can handle your chosen battery voltage and current draw.
- How does the 14-pole configuration benefit my RC flying? — The 14-pole design provides smoother operation with less vibration compared to lower-pole-count motors, resulting in more refined flight characteristics and reduced noise. It also delivers more consistent power throughout the throttle range, which is particularly valuable for precise flying or racing applications. The smoother commutation means less electromagnetic noise interference with your RC radio system.
- What aircraft types is this motor suitable for? — The 1900KV rating and outrunner configuration make this motor suitable for medium-weight RC aeroplanes, sport planes, intermediate multirotor platforms, and various experimental RC aircraft designs. The exact compatibility depends on your airframe weight, desired performance characteristics, and propeller selection, so consult sizing calculators and experienced RC builders for your specific project.
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 SPM 2840-1900Kv Brushless Outrunner Motor, 14-Pole M-SPMXAM3900 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.
We want to make sure your delivery goes smoothly, so here are some important details about our service:
- For orders above £120, we offer delivery to most mainland UK addresses. For orders under £120, we can still deliver to Northern Ireland and the outlying isles, as long as the item can be sent by Royal Mail, weighs less than 30kg, and fits within 61cm × 46cm × 46cm. Some highland and remote areas may carry an extra delivery charge as couriers often apply surcharges in these locations. If you live in one of these areas, feel free to contact us before ordering so we can confirm the delivery options and costs for you.
- Most of our products include delivery in the price. If your order is under £90, a small delivery fee will apply but do not worry this will always be clearly shown at checkout before you complete your purchase.
- Depending on what you choose at checkout, your order will usually be delivered either the next working day or within 2 working days. For next day delivery please place your order before 2:00pm. Orders are dispatched Monday to Friday only. Some items may take a little longer and if that is the case we will always show the expected delivery time on the product page.
- If your order includes items with different dispatch times we will normally wait and send everything together once all items are in stock. If one of the items is going to take a while we will give you the choice either wait for everything to arrive or let us send the available items now and deliver the rest later. It is up to you.
- We use trusted delivery partners to make sure your order gets to you safely and on time. We use DPD for next working day deliveries and Royal Mail for the 2 day option.
- As soon as your order is on its way we will send you a tracking number by email. If you provide your mobile number at checkout we will also send delivery updates straight to your phone so you can keep an eye on progress.
- If a product is marked as "Dispatched within 3 working days" delivery usually takes around 3 to 5 working days from when your order is placed.
- For customers in Inverness and other parts of the Scottish Highlands deliveries can take up to 2 working days even if you select next day delivery as couriers do not currently offer a guaranteed next day service to those areas.
