Top 19 How To Choose Servos For Rc Plane Quick Answer

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In general, the bigger and heavier the model, the higher torque your servo should provide. Airplane control surface area and servo arm length are also factors. Speed – A fast or slow servo will alter the ‘feel’ of your model. Fast is good, but using a servo that is too fast can cause a twitchy feel.The bigger and heavier your RC car is, the higher torque your servo should provide. It is important to choose a servo which is strong enough to handle the size and weight of your car. A normal 1/10 buggy or short course/stadium truck ideally needs a torque of around 10kg.Number of servos depends. Tail wheels can be driven direct off the rudder which means 1 servo for rudder, usually 1 for elevator, ailerons can have both 1 or 2 depending on the configuration. Also elevators could have 2. It really depends on the build.

How do I choose a RC servo?

The bigger and heavier your RC car is, the higher torque your servo should provide. It is important to choose a servo which is strong enough to handle the size and weight of your car. A normal 1/10 buggy or short course/stadium truck ideally needs a torque of around 10kg.

How many servos do you need for an RC plane?

Number of servos depends. Tail wheels can be driven direct off the rudder which means 1 servo for rudder, usually 1 for elevator, ailerons can have both 1 or 2 depending on the configuration. Also elevators could have 2. It really depends on the build.

Are all RC servos the same size?

RC servos are categorized into six standard sizes shown in the table below. To help you select the correct servo for your project we have included an approximate weight and size specifications for each servo category.

Are all RC servos compatible?

Most hobby servos use a standard type of 3-pin plug, with the same control signaling, which makes RC servos reasonably interchangeable.

What do the numbers on servos mean?

The smaller the number, the faster the servo is. For example a 0.12 sec/60° servo rating means it will take 0.12 seconds to rotate the servo arm or wheel 60°. This would be twice as fast as a servo that is rated in the 0.24 sec/60° range.

How do I know what size servo to get?

Divide the motor speed by the required speed and round down to get a starting gear ratio. Then divide the required torque by the gear ratio to find the new required torque. This will narrow the choices down to just a couple of motors.

What are the 3 types of servos?

Servo motors come in many sizes and in three basic types. The three types include positional rotation, continuous rotation, and linear. Positional Rotation servos rotate 180 degrees. They also have stops in the gear mechanism to protect the output shaft from over-rotating.

What servo motor do I need?

Top three factors in choosing a servo motor

Once the application is specified, identifying the peak torque, continuous torque and speed required of the motor will dramatically narrow down which motor is right. Torque and speed go hand in hand when selecting a servo motor.

How many channels do you need for RC plane?

Add retracts and you are at 7 channels for a pretty common configuration. Likewise, for a CP helicopter, 6 is the basic number but many use 7 for gyro control (leaving gear open). So my advice to most people is to set 7 as your minimum, not 6.

What electronics do you need for a RC plane?

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  • Transmitter ( Radio ) & Receiver.
  • Brushless Motor.
  • ESC with BEC.
  • Servos – Minimum 2 required.
  • LIPO Battery.
  • Propeller.

How strong is a 9g servo?

This mini servo is quite impressive, it does quite the job for a large range of tasks. Only weights 9 grams and gives you a 1.6kg cm torque. Pretty strong regarding its size. Suitable for Beam robots and other automation tasks.

Will any servo work with any receiver?

Yep – Just about any servo sold today will work. You can use analog servos on just about any of the receivers, but if using an Sbus decoder, or one of the glider receivers, we do suggest using a digital servo.

What does the kg mean on servos?

Servo motors are rated in kg/cm (kilogram per centimeter), and most hobbyist servo motors are rated at 3 kg/cm, 6 kg/cm, and 12 kg/cm. This rating represents the motor’s torque for a pulley at the radius of 1cm, and it gets weaker as the radius increases.

What is the difference between a digital and analog RC servo?

The delay in time before the next pulse of power is much better than an analog servo.

The Digital RC Servo.
Digital Servo Advantages Digital Servo Disadvantages
Excellent Holding Power Higher Power Consumption
Minimized Deadband Zone High Frequency Audible Noise
Excellent Resolution
21 thg 1, 2020

Can I mix digital and analog servos?

They can be mixed, but it is really not a good idea. Only if the receiver knows they are digital, and is set up for them. The circuitry inside the servo determines frame rate, not the receiver. The transmitter, if it has the capability, has to be programmed to match the servo.

What is a good RC servo?

The 5 Best RC Servos for Steering: Buyer’s Guide
ZOSKAY DS3235 35KG ZOSKAY DS3218 20KG
High-precision metal gears Dual ball bearings Low noise Large torque and speed High-precision metal gears with hard anodizing Waterproof IP66
Check Price Check Price
1 thg 2, 2022

How long do RC servos last?

In ideal conditions a servo motor can last 20+ years, and under extreme conditions can last less than one year. Most OEM (original equipment manufacturers) contribute the lifespan of their servo motors to the lifespan of the bearings.

How many volts do servos need?

6.0vdc is the preferred voltage for servos. There is no easy way to protect servos from burning up with fuses.

How accurate are RC servos?

Limited range of motion – Most RC servos are limited to 180 degrees of motion. Moderate precision – Positioning accuracy and repeatability of +/- 1 degree is typical.

Will any servo work with any receiver?

Yep – Just about any servo sold today will work. You can use analog servos on just about any of the receivers, but if using an Sbus decoder, or one of the glider receivers, we do suggest using a digital servo.

What does the KG mean on a servo?

Servo motors are rated in kg/cm (kilogram per centimeter), and most hobbyist servo motors are rated at 3 kg/cm, 6 kg/cm, and 12 kg/cm. This rating represents the motor’s torque for a pulley at the radius of 1cm, and it gets weaker as the radius increases.

Are digital and analog servos interchangeable?

What this means is that every cureent major brand of servos on the market are compatible with every current brand of RX on the market and all are interchangeable. You can one each Hitec, Futaba, Airtronic, JR, Tower, Hobbico, etc on the same plane and they can be a mixture of analog and digital.

What is a coreless servo?

In a conventional servo, the motor has a steel core armature wrapped in wire that spins inside the magnets. In a coreless design, the armature uses a thin wire mesh that forms a cup that spins around the outside of the magnet eliminating the heavy steel core.


How to Decide Which Servo to Use for My RC Airplane : RC Planes
How to Decide Which Servo to Use for My RC Airplane : RC Planes


Choosing the Correct Servo – Savox USA

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    Updating Size – The servo mounting dimensions will determine the size of the servo that you choose. Our servos are classified as Large Scale, Standard, Mini, or Micro, to help narrow your choices. Also note that some have different depths, which can cause issues in models with limited mounting space. Torque – What is the size a
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Choosing RC Servos for your RC Airplane

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Specifications of RC Servos

Torque

Servo Speed

Servo Dimensions and Weight

RC Servo Bearings

Gears Inside RC Servos

Digital vs Analogue RC Servos

Motors That Drive Servos

Servo Plugs and Wires

Let’s Go Flying!

Choosing RC Servos for your RC Airplane
Choosing RC Servos for your RC Airplane

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How to Choose a Servo | EuroRC.com

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How many servos? – RC Groups

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Servo Size Explained | Motion RC Europe

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Servo Size Explained | Motion RC Europe
Servo Size Explained | Motion RC Europe

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Hobby Servo Tutorial – learn.sparkfun.com

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Introduction

Servo Motor Background

A Handful of Distinctions

Deploying Servos

Controlling a Servo with Arduino

With the Servo Trigger

Troubleshooting

Resources & Going further

Hobby Servo Tutorial - learn.sparkfun.com
Hobby Servo Tutorial – learn.sparkfun.com

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RC Servos: The Muscles of Our Hobby. How They Work, What to Get.

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RC Servo Operation Basics

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RC Servo Motor TypesBrushed Coreless Brushless

RC Servo Brand RecommendationsKST Tops My List

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RC Servos: The Muscles of Our Hobby. How They Work, What to Get.
RC Servos: The Muscles of Our Hobby. How They Work, What to Get.

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RC Plane Assemby Tips from the Pros – Matching Servo Size and Performance to your Airplane – Model Airplane News

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RC Plane Assemby Tips from the Pros - Matching Servo Size and Performance to your Airplane - Model Airplane News
RC Plane Assemby Tips from the Pros – Matching Servo Size and Performance to your Airplane – Model Airplane News

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The high torque servo and how to select one for RC airplane use

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The high torque servo and how to select one for RC airplane use
The high torque servo and how to select one for RC airplane use

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How to choose an RC Servo

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How to choose an RC Servo
How to choose an RC Servo

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RC Plane Servo Setup

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RC Servo Selection

Servo installation – screw or glue

RC Plane Servo Setup
RC Plane Servo Setup

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Error 403 (Forbidden)

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Choosing the Correct Servo

Size – The servo mounting dimensions will determine the size of the servo that you choose. Our servos are classified as Large Scale, Standard, Mini, or Micro, to help narrow your choices. Also note that some have different depths, which can cause issues in models with limited mounting space.

Torque – What is the size and weight of your model? In general, the bigger and heavier the model, the higher torque your servo should provide. Airplane control surface area and servo arm length are also factors.

Speed – A fast or slow servo will alter the ‘feel’ of your model. Fast is good, but using a servo that is too fast can cause a twitchy feel. Don’t overdo it!

Voltage – All of our servos can be run on 6 volts. In order to use a 2S LiPo receiver battery without a BEC, you will need to choose the 7.4 volt compatible servos. These servos can also be used with lower voltages but the performance will be lower.

Gear Train – Metal gears are recommended for cars and trucks, or any model that will be used aggressively or will be subject to hard impacts. If weight or price is a concern, then plastic gears are a good choice for “low impact” applications. If you aren’t sure, choose metal gears. We recommend using a servo saver for any high impact application, regardless of gear material choice.

Motor – Savox offers three motor choices: DC, Coreless, and Brushless. DC motors are best suited to less demanding applications, and are the least expensive. Coreless motors offer better power and reliability, and are able to change directions more quickly and precisely. Brushless motors produce ultimate power, quicker torque, faster response, greater efficiency and are the longest lasting.

Servo Case – Aluminium is used to improve heat dissipation from the motor but this has a slightly higher weight over the plastic case models. A full aluminium case reduces flex, and provides a more stable platform for the gear trains and mounting points for heavier models. Full aluminum case servos are NOT indestructible, but are quite strong.

Waterproof - Our waterproof servos are IP67 rated, which means they are “Protected against the effects of immersion in water to depths between 15 cm and 1 meter”. That means they can be “dunked”, but they cannot withstand underwater movement at higher depths.

Choosing RC Servos for your RC Airplane

Choosing RC Servos

Choosing the right RC servos for YOUR RC airplane is much easier than you might think. Servos are literally the “muscles” that control every moving part of our RC airplanes.

Servos actuate the control surfaces, throttle, landing gear, smoke, and anything else aboard the airplane that needs our input while in the air. Different types of servos are better suited for different applications, each with advantages and disadvantages.

This page you will explain the different types of servos and options available in order to help you choose the right servo for your application. If you’re interested in how servos actually work and how they communicate with your receiver and transmitter then be sure to check out this tutorial on RC Servos.

Specifications of RC Servos

The literature for just about every RC airplane, whether it be a kit or ARF, will recommend a certain servo. Many times the recommendation will be a specific model servo of a brand they support.

It’s always safe to stick with what the manufacturer suggests. But what if you want a different brand to match your radio? Or maybe you want better performance out of your plane?

You want a servo than can handle the torque required to move your control surfaces quickly and precisely. A servo’s characteristics are defined by the following specifications.

Torque

Speed

Dimensions

Weight

As you can see in the specifications for the Futaba S300 standard servo above, the torque and speed depends on the voltage of your onboard battery.

The majority of servos are powered by 4.8V. Upgrading to a 6.0V receiver battery is a great way to increase the performance of your servos and possibly extend flight times. Make sure you take the added weight of a larger batter into consideration…

Torque

Torque is a measurement of the strength of a servo. Torque is determined by multiplying the force acting on the servo arm by the distance from the center of the servo.

The air passing by the airplane is always trying to make the control surfaces move. The servos must “fight” this air resistance in order to move or hold the control surface neutral.

As the size of an airplane increases, the wind resistance acting on the control surfaces increase. This is why larger airplanes need RC servos with more torque than smaller airplanes require.

However, the size of the airplane isn’t the only factor that determines how much torque you need. The type of airplane you have as well as your flying style will ultimately determine how much torque is required of the servos.

3-D airplanes have very large control surfaces which require much more torque than a non 3D sports planes of the same size. Also, if your flights tend to be gentle and laid back, you can by with less torque than someone who likes to jerk the sticks around to perform crazy violent maneuvers.

Servo Speed

The speed of an RC servo is defined as the minimum amount of time it takes the servo arm to rotate 60 degrees at maximum rated torque.

Obviously if the servo is being used on a control surface, you want the speed to be as fast as possible. If the RC servo is used on the landing gear, you’ll probably want the speed to be a bit slower.

Don’t be deceived by the speed rating. The “top speed” of a servo isn’t an accurate measure of how quickly the servo responds to your stick movements.

Speed is a very important specification, but there are other factors that we will discuss below that will ultimately determine how quickly and precisely the servo responds to your input.

Servo Dimensions and Weight

The dimensions and weight of a servo is directly proportion to the torque requirements. Micro RC Airplanes use a small servo where as Giant Scale Airplanes require very large servos. This is fairly self evident and is more or less common sense…

Don’t mean to insult your intelligence here…

There are RC servos specifically designed for just about any size RC aircraft out there. The first step is to find a servo that meets your torque requirements, then make sure the weight and dimensions are suitable for your airplane.

RC Servo Bearings

The shaft of an RC servo is supported by either a ball bearing or a bushing. A servo with bearings will operate much more smoothly and will last much longer than a bushed servo.

Most standard size servos these days will have either 1 or 2 bearings on the output shaft where it exits the servo case. Many micro servos do not have bearings because the loads are too small to justify the added weight of bearings. In contrast, most large scale servos need two bearings to support the large loads of the control surfaces.

Kits are available that supply the ball bearings and case tops in order to replace the bushing with bearings. These kits provide a very economical way to upgrade your servos without having to replace them.

Gears Inside RC Servos

The motors inside of our servos turn much faster than we would ever need the servo to move. For that reason, every servo has a set of gears that reduces the speed of the output shaft. As with any gear reducer, this also causes the torque of the output shaft to be much higher than the torque of the motor.

Most servo gears are made from a type of plastic called nylon. Sometimes under excess torque these plastic gears will strip out. If you’re lucky, you will get some warning signs before having a catastrophic failure that destroys your airplane. But there have been a many of crashes due to stripped servo gears.

Many large scale or 3D pilots will buy RC servos with metal gears. These are bit more expensive and they weigh a little more. But they will withstand a lot more torque than standard plastic gears. The only downside, besides the added weight, is that metals gears will wear over time and this leads to slop in the servo. This wear happens slowly and gives you plenty of warning, as opposed to set of nylon gears that has the potential of stripping any time it is overloaded.

Replacement gears sets are readily available for both metal and plastic. So when you destroy the gears in your servo, it is cheaper to replace the gears rather than buy a new servo.

Digital vs Analogue RC Servos

The physical working portion of a digital servo is exactly the same as a standard RC servo. Both have the same plug and both can be used by a standard receiver. The only difference is the digital servo has a microprocessor that modifies the frequency of the control pulses to the motor.

If you’re not familiar with how a standard servo operates, you may want to read this page that explains pulse code modulation in order to have a better understanding of the following discussion.

Lets say you only want to move the servo a tiny bit, so you barely move the transmitter stick off center. A standard servo will receive a series of extremely short full voltage pulses 50 times a second. These very short length instantaneous voltage pulses occur so infrequently that the motor doesn’t even react. The amount of transmitter stick movement from center position that is required to make a servo start moving is called the servo’s deadband.

If you’re flying a trainer or sports RC airplane, the deadband isn’t a huge deal. But if you’re a helicopter or 3D pilot you need every bit of the stick movement to count. Too much deadband could lead to a dead plane!

A digital servo’s microprocessor will convert the signal to shorter length pulses at a frequency of 300 times per second as opposed to 50 times per second of the original PPM signal. The motor is able to respond to smaller stick movements because it is receiving those very short pulses 6 times more often. This also gives a digital servo much stronger holding power because it reacts much more quickly when pushed out of position.

Digital servos react to your stick movements much more accurately than standard RC servos. You can think of this like the frame rate of a video. A video will appear much smoother if the frames are shorter and appear more often, as opposed to longer frames that occur less often. This same logic can be applied for understanding why digital servos give you much more precise control over your RC airplane.

This is a good article from Futaba if you want a more in-depth explanation of how a digital servo works.

Motors That Drive Servos

If you’ve been shopping around for a servo you have probably noticed the different types of servo motors available. You will see 3P, 5p, coreless and brushless. So which one should you choose?

3P and 5P

Most RC servos on the market are either 3 pole(3p) or 5 pole(5p) motors. All DC motors have a set of permanent magnets that the electromagnets(windings) are attracted to. These permanent magnets are called poles.

The torque of the motor can be reduced if the electromagnets happen to be precisely in between two poles when the servo is trying to hold position. In other words, 5P motors will have more holding torque with smoother operation than 3P motors. If you’re a beginner, there probably isn’t enough difference that you would even be able to tell.

Coreless Motors

In a conventional motor, windings are wrapped around a metal core to form the electromagnets. A coreless motor does not have a core. The windings consist of a wire mesh that rotates around the outside of the permanent magnets.

This eliminates the problem with reduced torque at certain positions as discussed above with standard “pole” motors. A coreless motor will also respond much quicker to stick inputs because it doesn’t have to overcome the momentum of a metal core when changing directions.

Brushless Motors

Futaba has recently developed a brushless servo motor. So you get all the benefits of a brushless motor incorporated into your servo. This translates into longer servo life, faster response time, smoother operation and resistance to vibrations.

Servo Plugs and Wires

All RC servos will have three wires. One wire is positive lead (+) from the battery. One wire the ground (-) from the battery. The third wire is the control input from the receiver.

It is important to note that you can’t just swap the pos.(+) and neg.(-) to reverse the servo. Doing so may damage your servo and receiver. You can buy connectors that act as a servo reverser by reversing the control signal. A Y connector is commonly used with two ailerons servos that share the same receiver output. The Y connector reverses the signal to one servo so that the two aileron servos act opposite of one other.

Futaba’s “J” connector is a plug with a little plastic tab, or key, that prevents you from plugging it in backwards.

Futaba’s J plugs, Airtronic’s Z plugs, Hitec’s S plugs, Hobbico’s U plugs, and JR’s connectors are all compatible as long as you make sure the wires are in the correct order within the plug. If you want to plug a male Futaba plug into another brand you will have to shave the safety tab off.

If your servo is a different brand than your receiver, it is critical that you have the appropriate wires lined up before plugging the connectors together. The wires can easily be popped out of the connector for rearrangement.

The images below show you the wiring schematic for the plugs of the four major servo manufacturers.

The above images were provided by Blue Point Engineering.

Check out these related pages…

How to Choose a Servo

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All products listed as “in stock” are in our warehouse and ready to be shipped within the next day. Exceptions to this are pre-orders and possible, but unlikely, errors in stock numbers. All products include the VAT according to the destination country. Prices are subject to change without prior notice.

Customer service speed

We are answering emails everyday from the morning to the late evening, no matter if its Sunday or Christmas eve. We work in the EET time zone which is +2h from GMT. During the day our customer service is usually really fast and in the evening we are little slower due we have less people to answer questions. Easier things are usually handled within the hour and shipping related things we try to handle during the day so they can be shipped out the same day. Our goal is to answer all emails within 24h no matter how difficult the question is. The fastest way to get customer service is always to send us a email. Please include relevant pictures and a structured email with proper sentences so we can answer you faster. Take your time and read trough your email once before you send it to us.

Payment Methods and Shipment Information

We ship globally for example to Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden and United Kingdom, Norway, Turkey, Switzerland). And many other countries, just go to the checkout and see if you can checkout. If not just let us know and we will quote you a price as we are able to ship to any country in the world.

We accept Paypal, credit card payments and IBAN/BIC (SEPA) bank transfers.

Payment service

Our credit card and web bank services are delivered by Finnish Paytrail Oyj.

Paytrail Oyj, Business-id: 2122839-7

Innova 2

Lutakonaukio 7

40100 Jyväskylä

Finland

www.paytrail.com

Currency

All payments are made in Euros. You can however browse the shop in other currency but the price then is not final. You will see the final Euro price in your shopping basket when paying for the product. The price is shown in “5. Send Order” part of the checkout form.

VAT

Our shop automaticaly includes or excludes VAT percentage from the prices by the destination country. You can change the destination country from the checkout pages before you order. All our customers will pay the same price no matter the included VAT percentage. Companies who are buying with VAT numbers can buy products with exluded VAT according to destination country.

Shipping options

You can browse all our shipping options with out registering. Just add the products you are interested in and proceed to checkout page where you can see all the shipping options and estimated delivery times.

Basic tracked shipping starts from 4,90€ (GLS road freight) in European Union countries.

Estimate Shipping times with GLS .

An international GLS parcel is delivered to neighbouring states of Finland like Sweden or the Baltic countries in a standard delivery time of 24 to 72 hours. To more distant European countries the international parcel dispatch takes between three and six working days, to remote areas up to eight days. Rough estimate is 1 week from order to delivery.

Please note that GLS shipping time is calculated in working days (Monday to Friday) and excluding the day when parcel is shipped.

Note! Here you can find estimated delivery times.

Note! Here you can find collected statistics about average delivery times.

Estimated shipping times by DHL and UPS

• DHL Express and UPS Express are our fastest delivery options. Both options can reach almost anyplace in EU in 1 day, but some places take 2 days.

• Depending what kind of products you want to order the shop will let you choose from available shipping options.

• Both Options are also Door To Door Services. The Courier will deliver the parcel to your door. But they also have pickup points where they might drop your package off so you can pick it up when it suits you.

When you are checking out your order you can see a more precise estimate of each shipping option to your country.

Refund policy

We accept returns of new, unused merchandise within 14 days from the delivery. Please contact us at [email protected] to receive return information. The customer is responsible for any return costs unless otherwise agreed to with our customer service. We try to return the money with the same payment method that was used to pay for the order, if its not possible we make a wiretransfer. You can also request a gift card if you are making a new order to speed up the process.

We also accept returns after 14 days upto 50days, but we refund them with a giftcard to our shop so you can replace them with any products we sell. Please contact our customer service for details.

After we receive the merchandise and verify its re-sellable condition, we will refund the money or give you a giftcard. Depending on the item this will take 1-3 days after we have received the item. If there is a delay we will contact you.

Note! Every return made without notice via email will be charged with handling fee of 20€. Handling fee will be reduced from the total refund.

Damaged Shipment

In the rare occurrence that the shipment has been damaged, please take pictures and send those to our customer service [email protected] immediately and we will make sure we get you sorted and back to enjoying our hobby. Also notify the courier bringing you the shipment that it has been damaged.

Defective parts and Warranty Issues

If you feel that your product is defective please send us a email and we will let you know what to do next. Most items do not have a warranty as they will break in normal usage. For example if you hit something solid or take a larger tumble. Properly used items should easily last 3-12 months and during this period we are able to replace broken items if they have a manufacturing or material fault. We have years of experience with different makes and they all have different warranty policies. We have chosen to work with brands that have a good understanding how to serve their customers and you can be assured that you will get the best customer experience possible with us.

We do not replace or exchange products that are not defective or broken by improper use or have not been maintained. But we do help and teach you how to do things properly so you do not break anything in the future, just email us and we will help you out. We are however unable to wrench for you, its part of the hobby so its important that you will learn that part also your self, we have great tools to sell you so just ask us what you need.

Note! Many manufacturers are strickt that electronics are not allowed to be modified (connectors changed etc.) without disabling the warranty. Remember to check this from your products manual.

Don’t worry you are safe with us! Most of our customers feel that they get excellent service in the rare occurrence that they encounter a problem with the product they have bought.

And remember if you run in to a problem or you feel that there is a problem with arrived products do not hesitate to contact us. We are here to help and we do our best to sort it out as soon as possible.

What happens if EuroRC made a error in the shipment?

We ship a lot of orders each day and rarely there are errors. We do however try to minimize the effect on the customer. Please contact us immediately if we have made an error and we will make it right.

Address for returns

Always contact us before returning any product, we can not take responsibility for shipments that are sent without prior notice. Its very important that we can tell you how to mark the parcel so it will be processed in a timely fashion.

EuroRC Oy

Päiviöntie 8

12400 Tervakoski

Finland

[email protected]

I accept the delivery terms

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