Information Articles

Helpful information on RC airplanes, RC blimps, RC helicopters, and RC hobby parts like brushless motors and ESCs, Lithium Polymer batteries, cell balancers and chargers.


Thunder Power RCs new Pro Power 45 C Series LiPo Batteries

Thunder power has just recently made available a new line of Thunder Power RC Pro Power 45C lipo batteries. Building on the incredible success of Thunder Power RCs’ G4 Pro Lite V2 20C and Pro Power 30C batteries now proven to offer significantly more power (up to 30%) and cycle life (up to 5-times more plus 5C charge rate capability with NO loss in cycle life delivery) than most previous generation batteries, Thunder Power RC is excited to once again lead the way in the LiPo battery market with the release of the most advanced, most powerful and longest lasting series of LiPo batteries ever made available for extreme-performance RC aircraft models! The all-new Pro Power 45C series batteries, available in capacities from 325mAh to 5000mAh and in configurations from 1S 3.7V to 10S 37.0V, offer up to 40% MORE POWER and up to 6-TIMES MORE CYCLE LIFE than previous generation LiPo batteries. They’re also capable of ULTRA-FAST CHARGE RATES UP TO 6C WITH NO LOSS IN CYCLE LIFE DELIVERY. And best of all these packs are PROUDLY ASSEMBLED IN THE USA BY THUNDER POWER RC IN LAS VEGAS, NV!

Check out all these great batteries that we now carry below:

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Announcing 5 New Thunder Power Batteries For Your RC Planes, Cars and Helicopters

Thunder Power RC Is a World Leader in Lipo and RC Power Technology

We’re pleased to announce the release of 4 brand new Thunder Power Lipo batteries. We pride ourselves on carrying every Thunder Power battery manufactured. These recent additions represent some of

Thunder Power’s coolest new developments.

New Thunder Power 7.4V 2S 5400 Saddle Pack

This new battery from Thunder Power RC features a saddle shaped design, with two individual battery packs wired in series. This allows for greater flexibility and increased capacity. ROARR approved, this saddle pack lipo battery is perfect for all your RC cars and trucks.

Specifications for the Thunder Power TP-5400-2SPRSD Lipo

  • Voltage: 7.4 V
  • Cells: 2-Cell (2s)
  • Capacity: 5400 mAh
  • Max Continuous Discharge: 25C
  • Max Burst Discharge: 50C
  • Max Continuous Current: 135A
  • Max Burst Current: 270A
  • Weight: 331g
  • Dimensions: 28 x 46.5 x 69 mm Saddle Pack
  • Series: Pro Race Series Surface Pack
  • Balance Connector: Thunder Power RC 4 Pin
  • Connector: Deans Ultra
  • Case Type: Standard

New Thunder Power Sport Race 3s 8000 Lipo

Expanding the Sport Race Series is the new 8000 mAh 3 cell 11.1 V pack. Capable of providing 22C continuous and 45C burst current, this battery is perfect for larger RC model airplanes. As with all our thunder power batteries, the 3s 8000 is fully compatible with our Lipo battery chargers. New to electric RC? We’ve got a great selection of Thunder Power compatible balancers and chargers available. This battery pack also features standard Deans connectors, so you can use it easily with your other standard RC equipment and ground vehicles.

Specifications for the Thunder Power RC TP-8000-3SSRD LiPo:

  • Voltage: 11.1V
  • Cells: 3-Cell
  • Capacity: 8000mAh
  • Max Continuous Discharge: 22C
  • Max Burst Discharge: 45C
  • Max Continuous Current: 176A
  • Max Burst Current: 360A
  • Weight: 530g
  • Dimensions: 139 x 41 x 39mm

New Thunder Power Sport Race 2s 8000 Lipo

Designed specifically for ground vehicles, this battery pack is ROAR approved and fully compatible with all our Thunder Power chargers. Standard Deans connectors allow you to use this pack with all your RC ground vehicles.

Specifications for Thunder Power RC TP-8000-3SSRD LiPo

  • Voltage: 7.4 V
  • Cells: 2-Cell (2s)
  • Capacity: 8000 mAh
  • Max Continuous Discharge: 22C
  • Max Burst Discharge: 45C
  • Max Continuous Current: 176A
  • Max Burst Current: 360A
  • Weight: 382g
  • Dimensions: 30 x 46.5 x 138 mm
  • Series: Sport Race Series Surface Pack
  • Balance Connector: Thunder Power RC 4 Pin
  • Connector: Deans Ultra
  • Case Type: Medium

New Thunder Power Pro Race 4s 5000


This brand new Thunder Power battery adds to the large Pro Race Series. Pro Race series batteries are specifically engineered for optimal racing performance. Capable of providing a maximum burst discharge of 80C, this battery adds incredible performance to your RC cars, trucks, and other electric surface vehicles.
<h2>Specifications for Thunder Power RC TP-5000-4SPR LiPo</h2>

  • Voltage: 14.8 V
  • Cells: 4-Cell (4s)
  • Capacity: 5000 mAh
  • Max Continuous Discharge: 40C
  • Max Burst Discharge: 80C
  • Max Continuous Current: 200A
  • Max Burst Current: 400A
  • Weight: 564g
  • Dimensions: 46 x 46.5 x 138 mm
  • Series: Pro Race 40C Series Surface Pack
  • Balance Connector: Thunder Power RC 4 Pin
  • Connector: Deans Ultra
  • Case Type: XX-Large


New Thunder Power RC TP-5000-1SPRD Lipo

Featuring an extra large 5000 mAh capacity, this new Lipo battery is perfect for smaller RC cars, trucks, and other ground vehicles. This one cell battery provides 3.7 volts at a maximum burst current of 80C. Tested and approved at the ROAR lab this battery is officially approved for usage at ROAR sanctioned events. The TP-500-1SPRD Lipo battery also features standard Deans connectors, allowing you to use it with all your standard RC equipment and surface vehicles.

Specifications for Thunder Power RC TP-5000-1SPRD LiPo

  • Voltage: 7.4 V
  • Cells: 1-Cell
  • Capacity: 5000mAh
  • Max Continuous Discharge: 40C
  • Max Burst Discharge: 80C
  • Max Continuous Current: 200A
  • Max Burst Current: 400A
  • Weight: 145g
  • Dimensions: 135 x 45 x 17mm
  • ROAR Approved

Do you need chargers, balancers, connectors and other accessories for your lithium polymer rechargeable RC batteries? We carry a huge selection available for purchase online or over the phone.

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Announcing the Draganflyer X4 Helicopter: a Brand New, Ultra Portable, VTOL UAV

We are pleased to announce the release of our latest UAV helicopter, the Draganflyer X4. Several hundred hours of research and development went into its design, bringing about a sleek, sophisticated UAV. The Draganflyer X4 features much of the same technology as the Draganflyer X6, but is available at a much lower cost. Designed for commercial, government, and military applications, the Draganflyer X4 provides affordable aerial photography and videography.

Diverging from our larger 6 rotor design, the Draganflyer X4 features the same quad rotor design used by our older helicopters. Four brushless motors independently drive four carbon fiber rotor blades, all controlled and monitored  by an advanced flight computer.

The flight computer uses SteadyFlight technology to process the inputs of seven individual sensors, including:

  • A barometric pressure sensor
  • Three accelerometers
  • Three gyroscopes

Click to learn more about the Draganflyer X4's latest computer systems

The flight computer reads sensor outputs and precisely determines the motor outputs required to keep the helicopter flying straight and level. If selected by the pilot, the barometric pressure sensor is used by the helicopter to maintain altitude. Properly trimmed and balanced, the helicopter will hold its position in the air allowing you to get excellent aerial photographs and video.

Four different cameras have been customized to work with our UAV, including:

  • A 12.1 MP digital still and video camera
  • A micro color video camera
  • low-light black and white video camera
  • A FLIR (Forward Looking Infra Red) video camera

Click to learn more about our latest handheld UAV flight controller

All of these cameras transmit wireless video via a 5.8 GHz transmitter built into the mount. Wireless video can be received using either the handheld controller (which includes its own flat patch video antenna) or the optional base station. Video glasses plug directly into the handheld transmitter, allowing you to see what the helicopter is seeing and get perfectly aimed aerial photographs and video. The optional base station is compatible with any modern PC running Windows and features three standard RCA output jacks. This allows you to use your own recording equipment with the cameras or even re-transmit the video stream if needed.

Learn more about the Draganflyer X4's innovative Camera Systems

Because all wireless communication is subject to interference, all of our cameras now feature a built-in DVR that records a pristine, interference-free copy of your aerial video to an SD memory card. After you finish flying, plug the SD memory card into your computer and edit the video using the software of your choice. Each camera also features a custom designed mount with a remote tilt feature (adjustable via the handheld controller). Designed to give you the best quality video possible, each camera mount features balanced, oil-filled shock absorbers. The shock absorbers keep the recorded video free from vibration, guaranteeing that you get the best possible results.

The Draganflyer X4 UAV features an innovative case system that makes transporting the helicopter easier than ever. The entire Draganflyer X4 helicopter presses neatly into its pre-cut slot in the case. Each part and accessory fits into molded high-density foam inserts for safekeeping during transport. The transport case features a dual layer design with flight accessories in the top layer and the base station in the bottom layer. A patented, load-bearing system clips on to the transport case allowing it to be worn like a backpack, and transported just as easily. Built from flexible Cordura™ nylon, the load-bearing system is securely attached using Fastex™ hardware and adjustable carry straps.

The entire transport case fits neatly into a rugged ATA (Airline Transport Association) certified hard case, rated to last over 100 flights as airline baggage. The padlockable, all-metal, carpet-lined ATA case allows you to safely transport the helicopter anywhere in the world without worrying about damage caused by the rigors of travel as airline baggage.

Designed for small enterprises and projects on a budget, the Draganflyer X4 is our most affordable unmanned aerial vehicle ever. Use the power of a full featured VTOL UAV  for your project – the Draganflyer X4 makes professional quality aerial photographs and video easier to obtain than ever before.

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The Comprehensive Multiplex Easy Star and Minimag Repair Guide

So you’ve crashed your new Multiplex Easystar or Minimag. Now what? Don’t throw your model out, it’s extremely likely that it can be repaired to like-new condition. It turns out that the Elapor™ foam Multiplex planes are built out of is extremely crash resistant, and can even be re molded with heat. Elapor™ is also CA glue safe, making repairs simple and economical.

Gather Parts and Assess the Damage

After a crash occurs be sure to retrieve all the parts, no matter how small. Foam can be fitted back together like a jigsaw puzzle and glued in to place. So you want to make sure that no parts are left at the crash site. Put all the parts you retrieve in a bin and store them in a safe place until you’re ready to begin repairs. It’s generally a good idea to wait for a few hours or days before repairing damaged models. This gives you time to think about exactly what needs to be replaced, and how you would like to proceed.

Repairing Cracked and Broken Foam Parts

Repairing broken foam is very simple. Done correctly, you can hide the cracks and make your model look just like new. Here are the supplies that you will need:

  1. Thick CA Glue
  2. Clear Tape
  3. Popsicle Sticks

Apply a generous amount of CA glue to the broken parts, then use the Popsicle sticks to smear the glue around and cover the entire broken surface. Hold the parts together under pressure and then wrap the clear tape around them so that they stick together firmly. Let the glue cure for at least one hour and then remove the tape. Repeat for all your broken foam parts.

Fixing Bent, Compressed, and Distorted Foam

Unlike Styrofoam, Elapor™ can be heated and re-molded to its original shape. There are two ways to do this, both are outlined below:

  1. Hot water method – Boil a large pot of water, and then dip the distorted part for approximately 10 seconds. You will notice all of the foam cells enlarge and expand. This is what needs to occur for the remolding to take place. Using gloves or other thermal protection, bend the heated parts back to their original shape. Smooth out any bumps or surface defects using a metal spoon.
  2. Blow Dryer Method – This method works well for smaller dents and bends. Simply take an electric hair dryer (not a heat gun), and gently heat the damaged area for a few seconds. After you see the foam cells start to expand, bend and smooth out the damaged area back to its original shape.

Replacing Electronic Components

Both the Multiplex Easystar and Minimag are compatible with Hitec’s radio components.

Need More Help?

Although we can’t exchange aircraft that have been damaged in a crash, we’re still here for you and can talk you through most repairs. Feel free to contact us and we’ll do our best to help you.

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Bombs Away! Mod the Vortex Extreme RC Airplane With an Explosive Payload

No, seriously. Don't do this. (we were only kidding!)

Have you ever wanted to mod your RC airplanes, perhaps to carry an explosive payload? Too bad – it’s illegal. Don’t worry though, here at Draganfly Innovations, we’ve found the next best thing: you can mod inexpensive RC planes to carry containers of inert powder, which will shatter and make a super nifty effect on the ground. All you need are 5 minutes and some common household materials:

What You Need

  • Toothpick – We’ll use this to make a mount for the payload, and a mechanism that lets us deploy it remotely.
  • Plastic Easter Egg (or similar container) – Plastic Easter eggs work best, because they split in two easily. You can find them at almost every craft store. Improvising here is fine, just make sure that your container is a reasonable size, and will open up with minimal force.
  • Cellophane Tape – This mod isn’t permanent, just peel off the tape when your done with it.
  • Plastic Drinking Straw
  • Vortex Extreme RC Airplane – You can get one on our website. Similar models will also work, but if they’re of a different design, you’ll have to adapt these instructions accordingly.
  • Talcum Powder, Flour, or any (safe) Powdery Substance – Basically, anything that spreads out in the air and makes a big cloud will do.

How to Mod Your RC Airplanes

Click for a larger version

  1. Start by taking the wing off your RC airplane. You need it out of the way, because your going to be building the drop mechanism on the bottom of the plane. Besides, breaking foam wings is no fun – store it in a safe place until your finished these steps.
  2. Cut about a 1 inch length of straw, and tape it to the tail boom, 2 inches back. You want to get the straw aligned parallel to the tail boom, and hanging right on the bottom. What we’re trying to do won’t work if the payload rubs against the tail and gets stuck. You might want to click this picture, to get a closer view.
  3. Click for a larger image

    Tape the toothpick to the round end of the plastic egg. The aim is to give the toothpick an upward slant, so that the egg hangs on to your RC airplane under gravity.Try to leave as much of the toothpick as possible free – this gives you a more secure mount. It’s very important not to tape the Easter egg shut, because the whole point is to get it to split open on ground impact.

  4. Fill the Easter egg with powder, and then snap it shut.
  5. Slide the “bomb” onto your drinking straw launcher apparatus (see the picture on the right), and get the plane ready for flight.

Dropping the Bomb

Click for a larger version

The Easter egg you mounted is held on the airplane by gravity and wind resistance. To drop it, simply take off as usual, fly to a safe area (free of people, pets, and vehicles), and put your RC airplane in a nose dive. The “bomb” should slide off the mount, hit the ground, and produce a nice puff of smoke. Watch Out: many RC planes have crashed because the pilot was looking at the payload being dropped, and not paying attention to flying. Let spectators enjoy the bomb, and concentrate on landing your plane safely.

Here’s what the result of a properly detonated “bomb” looks like (the best explosion occurs at about 1:12 into the video):

Need RC airplanes for this project? Get a Vortex Extreme online. Perfect for beginners to learn how to fly, and affordable, it makes the ideal first RC airplane.

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ROAR (Remotely Operated Auto Racers) Sanctioned Thunder Power Battery Packs For Your RC Cars And Trucks

ROAR (Remotely Operated Auto Racers) is a national non-profit organization dedicated to promoting rc cars and trucks. ROAR also provides liability and bodily injury insurance for it’s members who race at ROAR sanctioned events and keeps a database of approved lithium polymer batteries. Tested at ROAR’s laboratory, approved lithium polymer batteries need to meet criteria including safety and performance. If you’re racing your electric car or truck at a ROAR sanctioned event, you should use approved batteries. We carry all of ROAR’s approved Thunder Power RC batteries, listed below:

Item / Part # Capacity / Cell Count / Voltage Max. Cont. Discharge Max. Burst Discharge Max. Cont. Current Max. Burst Current Weight (grams) Case Type
TP-325-1SPJ45 325mAh 1-Cell/1S 3.7V 45C 90C 14.6A 29.2A 12 Rounded
TP-325-2SPJ45 325mAh 2-Cell/2S 7.4V 45C 90C 14.6A 29.2A 21 Rounded
TP-325-3SPJ45 325mAh 3-Cell/3S 11.1V 45C 90C 14.6A 29.2A 31 Rounded
TP-850-1SPJ45 850mAh 1-Cell/1S 7.4V 45C 90C 38A 76A 50 Rounded
TP-850-2SPJ45 850mAh 2-Cell/1S 11.1V 45C 90C 38A 76A 74 Rounded
TP-1250-2SP45 1250mAh 2-Cell/1S 7.4V 45C 90C 78A 112A 76 Rounded
TP-1250-3SP45 1250mAh 3-Cell/1S 11.1V 45C 90C 78A 112A 115 Rounded
TP-1250-4SP45 1250mAh 4-Cell/1S 14.8V 45C 90C 78A 112A 146 Rounded
TP-1750-2SJ45 1250mAh 2-Cell/1S 7.4V 45C 90C 78A 157A 104 Rounded
TP-1750-3SP45 1250mAh 3-Cell/1S 7.4V 45C 90C 78A 157A 153 Rounded
TP-1750-4SP45 1250mAh 4-Cell/1S 14.8V 45C 90C 78A 157A 198 Rounded
TP-2250-2SP45 2250mAh 2-Cell/2S 7.4V 45C 90C 101A 202A 132 Rounded
TP-2250-3SP45 2250mAh 3-Cell/3S 11.1V 45C 90C 101A 202A 193 Rounded
TP-2250-4SP45 2250mAh 4-Cell/4S 14.8V 45C 90C 101A 202A 254 Rounded
TP-2250-5SP45 2250mAh 5-Cell/5S 18.5V 45C 90C 101A 202A 315 Rounded
TP-2250-6SP45 2250mAh 6-Cell/6S 22.2V 45C 90C 101A 202A 375 Rounded
TP-2250-6SP45 2250mAh 6-Cell/6S 22.2V 45C 90C 101A 202A 375 Rounded
TP-2650-2SP45 2650mAh 2-Cell/2S 7.4V 45C 90C 119A 238A 160 Rounded
TP-2650-3SP45 2650mAh 3-Cell/3S 11.1V 45C 90C 119A 238A 228 Rounded
TP-2650-4SP45 2650mAh 4-Cell/4S 14.4V 45C 90C 119A 238A 296 Rounded
TP-2650-5SP45 2650mAh 5-Cell/5S 18.5V 45C 90C 119A 238A 367 Rounded
TP-2650-6SP45 2650mAh 6-Cell/6S 22.2V 45C 90C 119A 238A 434 Rounded
TP-3250-2SP45 3250mAh 2-Cell/2S 7.4V 45C 90C 146A 292A 190 Rounded
TP-3250-3SP45 3250mAh 3-Cell/3S 11.1V 45C 90C 146A 292A 274 Rounded
TP-3250-4SP45 3250mAh 4-Cell/4S 14.8V 45C 90C 146A 292A 357 Rounded
TP-3250-5SP45 3250mAh 5-Cell/5S 18.5V 45C 90C 146A 292A 443 Rounded
TP-3250-6SP45 3250mAh 6-Cell/6S 22.2V 45C 90C 146A 292A 548 Rounded
TP-3250-7SP45 3250mAh 7-Cell/7S 22.2V 45C 90C 146A 292A 616 Rounded
TP-3250-8SP45 3250mAh 8-Cell/8S 29.6V 45C 90C 146A 292A 723 Rounded
TP-3250-9SP45 3250mAh 9-Cell/9S 33.3V 45C 90C 146A 292A 786 Rounded
TP-3250-10SP45 3250mAh 10-Cell/10S 37.0V 45C 90C 146A 292A 871 Rounded
TP-3800-2SP45 3250mAh 2-Cell/2S 7.4V 45C 90C 171A 342A 222 Rounded
TP-3800-3SP45 3800mAh 3-Cell/3S 11.1V 45C 90C 171A 342A 320 Rounded
TP-3800-4SP45 3800mAh 4-Cell/4S 14.8V 45C 90C 171A 342A 416 Rounded
TP-3800-5SP45 3800mAh 5-Cell/5S 18.5V 45C 90C 171A 342A 514 Rounded
TP-3800-6SP45 3800mAh 6-Cell/6S 22.2V 45C 90C 171A 342A 620 Rounded
TP-3800-7SP45 3800mAh 7-Cell/7S 25.9V 45C 90C 171A 342A 717 Rounded
TP-3800-8SP45 3800mAh 8-Cell/8S 29.6V 45C 90C 171A 342A 815 Rounded
TP-3800-9SP45 3800mAh 9-Cell/9S 33.3V 45C 90C 171A 342A 913 Rounded
TP-3800-10SP45 3800mAh 10-Cell/10S 37.0V 45C 90C 171A 342A 1011 Rounded
Item / Part # Capacity / Cell Count / Voltage Max. Cont. Discharge Max. Burst Discharge Max. Cont. Current Max. Burst Current Weight (grams) Case Type
TP-2700-2SSR 2700mAh 2-Cell/2S 7.4V 25C 50C 68A 135A 174 Rounded
TP3300-2SSR 3300mAh 2-Cell/2S 7.4V 25C 50C 83A 165A 178 Rounded
TP4300-2SSR 4300mAh 2-Cell/2S 7.4V 25C 50C 108A 215A 228 Rounded
TP5400-2SSR 5400mAh 2-Cell/2S 7.4V 25C 50C 135A 270A 284 Standard
TP3200-2SPR 3200mAh 2-Cell/2S 7.4V 40C 80C 128A 256A 212 Rounded
TP4200-2SPR 3200mAh 2-Cell/2S 7.4V 40C 80C 128A 256A 212 Rounded
TP5000-2SPR 5000mAh 2-Cell/2S 7.4V 40C 80C 200A 400A 304 Standard

You can browse through our huge selection of Thunder Power RC lipo batteries on our site. We pride ourselves on carrying every battery that Thunder Power RC manufactures, so if you see one that we’ve missed, feel free to contact us.

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Choosing The Right Servos for Your RC Planes and Helicopters



All RC airplanes and helicopters are controlled by servos - small, electromechanical devices that allow everything from controlled flight to payload releases. So what are servos?  How do they work? And how do you choose the ones that will work best in your model? We’ll answer all these questions, and take you through everything from the basics of servo operation to their technical details.

What is a Servo?

A servo is a device that can rotate to an arbitrary position, as set by the user. Servos usually consist of a small DC (direct current) electric motor, several gears, and a head where an arm or wheel can be attached. When the user tells the servo what angular position to move to, the servo rotates and holds that position until further input is specified. The servo holds position because external forces are always interacting with the aircraft, and would set control surfaces to undesired positions unless stopped. Servos exert a torque on external forces, that prevents them from changing the position of any control surface.

How Servos Work

A servos job is to convert the angular movement of a servo arm to the linear movement of a control surface. This is done by attaching linkages, called control rods to the servo arm and the associated control surface. When the servo head rotates, it pushes the control rod back and forth. The rod is linked to a control surface, and can move it up or down as the servo rotates.
Servos are controlled by three wires: two to provide the DC power that the motor needs, and one that sends the signal, controlling the servo. The signal wire works by sending the servo a series of pulses, which are interpreted by its internal circuitry. By varying the timing of each pulse, the servo knows exactly which position to move to.

RC Servo Motors

The motors that drive RC servos come in several different types. Here’s a list of the most common varieties, and some information on each to help you decide which ones to use:

  • Coreless – Conventional motors use copper wires wrapped around metal cores to form electromagnets. In a coreless motor, there is a metal mesh that rotates around the permanent magnets. Coreless motors respond more quickly than conventional motors, because they don’t have to overcome the momentum associated with heavy metal cores.
  • Brushless – Servos can be powered by brushless motors, giving them longer life, faster response time, and more torque.
  • 3 Pole and 5 Pole – Electric motors have permanent magnets, called poles, that electromagnets are attracted to. Servo motors can have either 3 or 5 poles, with more poles providing better torque. If you’re new to RC or have a regular sport model, you probably won’t notice the difference between 3 pole and 5 pole servos.

Choosing the Right Servo

Torque is the produce of force and distance

Servos have a number of defining properties that make them suitable for different applications:

  • Torque – This is a measure of the servos strength, or how much “push” it has. More precisely, torque is the product of force and the radius at which it acts. This is shown graphically in the figure on the right. Bigger planes need high torque servos to move their large control surfaces. In general, servo size goes up with rated torque.
  • Dimensions – Servos come in many different sizes, which you can choose from depending on your application.
  • Weight – The weight of a servo depends on several variables. Most often recorded in grams, the weight of a servo is always reported on the package.
  • Bearings – There are two ways to support the output shaft of a servo – bearings and brushes. Brushes are cheaper, but bearings last longer and operate more smoothly. Very small and very cheap servos tend to be brushed, while high end and very large servos generally have bearings. It’s possible to upgrade a brushed servo to bearings, with several upgrade kits being available on the internet.
  • Gears – Most hobby grade servos use nylon gears, while higher end servos use metal gears. Metal gears add more weight, but their advantage is that they can’t “strip”, causing an RC helicopter or airplane to crash. Metal gears wear over time, which can cause “slop” in their rotation, but the gears can be replaced somewhat economically. In general, nylon servos are adequate for sport flying. If you’re particularly worried about losing a model in a crash, or are flying intense aerobatics, a metal geared servo is probably the right choice.
  • Speed – Speed measures how fast the servo can move from one position to another. Different RC airplanes and helicopters will need servos with different speeds. For example: a trainer doesn’t need to change control surface positions rapidly, but a 3D helicopter or plane does. High speed servos are many times more expensive than standard ones.
  • Digital / Standard – Servos can be of two types: digital, or standard. Both digital and standard servos can be used with a normal receiver, the real difference is performance. All servos use a series of short pulses as signals that determine what angular position they should maintain. This series of signals is usually very fast, somewhere around 50 pulses per second maximum. On a standard servo, this rate is so fast that small movements of the control sticks may not have an affect. This means that there’s a small deadband on the control sticks, in which no servo movement takes place. Although it’s not a problem on trainers and most sport class models, the deadband becomes a significant issue with 3D aircraft. Even a small delay with a 3D aircraft could cause a crash.
    Digital servos remove the deadband by speeding up the rate at which it receives      pulses. Usually, this is increased from around 50 to 300 pulses per second. This increase in resolution allows the servo to operate much more precisely.

All RC kits and ARFs will specify the type and brand of servo required. Generally, you should adhere to these recommendations.

Now that you know what servos to get for your model, you can browse the large number of servos available on our website.

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