Losi: Glossary


  • 6-Cell Battery: The most common configuration of surface RC batteries, a 6-cell battery pack is constructed out of 6 individual cells that are soldered or spot welded together. The output voltage of a 6-cell battery is rated at 7.2 volts. A 6-cell battery pack is commonly referred to as a "Stick Pack".

  • A Return to Top



  • Anti-Squat: The angle of the rear inboard suspension mounts when they are angled towards the rear of the chassis.

  • B Return to Top

  • Backplate: A plate that seals off the rear of the crankcase of an engine. Backplates can be designed to accommodate pull start mechanisms as well.


  • Battery Cycling: To fully discharge and charge a battery in order to erase battery memory.


  • Battery Pack: An arrangement of batteries(cells) used to power an RC vehicle. Battery Packs are rechargeable, which saves you money in the long run.


  • Battery Charger: An electronic device that recharges a battery pack, making it possible to reuse the same battery over and over again


  • Brushes: Made from a combination of carbon, graphite and silver, brushes are used to transfer the current to the commutator to create locomotion. There are a number of sizes, shapes and configurations that brushes can be found in, but the most common is still rectangular.


  • Brushless Motor: A brushless motor uses its magnetic field to transfer current and create motion, where brushed motors require physical contact between the brush and commutator. Brushless motors are much more efficient thanks to their nearly friction-free operation.

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  • CA (Cyanoacrylate) An instant type glue that is available in various consistencies (Thin, Medium, Thick and Gel) used for minor repairs or to glue a tire to a wheel.


  • Capacity: The maximum amount of energy a battery cell can store.


  • Camber: The angle that the top of the tire leans inward or outward in comparison to the centerline of the chassis. Negative camber refers to a characteristic when the top of the tire leans inward towards the centerline of the chassis, while positive camber refers to when the top of the tire leans outward.


  • Carburetor A mechanical device used to adjust the mixture of air and fuel fed to the combustion chamber of an engine. By adjusting the needle valve in the carburetor, you control the engines lean/rich fuel mixture and determine the engines throttle response, temperature and overall speed.


  • Caster:Refers to the angle of the steering knuckle as it would be angled front or rearward. If you were to draw a line from the centerline of the knuckle to the ground, angling of the knuckle towards the rear of the car is referred to as negative caster. If the knuckle is angled towards the front of the car that is referred to as positive caster. In the rear of the car, this is referred to as Pro-Squat and Anti-Squat.


  • Cell: A single energy or charge-storing unit within a pack of cells that form the battery. Each cell has a voltage rating that is combined with the other cells' voltages to form the overall battery voltage rating.


  • Chassis: The main frame of an RC car or truck that all the components are connected to.


  • Controller: What you hold to control your RC model. There are two different styles of controllers. One is referred to as a stick radio, has two sticks, used to control throttle and direction. The other is called a wheel radio and utilizes a small steering wheel to control direction, while a trigger is used for throttle, brakes and reverse. This is also referred to as a transmitter.


  • Crankcase: Main body of the engine that houses the engines internal components.


  • Crystal: In traditional radios, the crystal is what determines what frequency a radio broadcasts on.

  • D Return to Top


  • Discharger: A device or feature built into a battery charger designed to completely drain a battery pack of all its stored energy.

  • E Return to Top


  • ESC: Electronic Speed Controlleran electronic device that regulates the current being transferred from the battery pack to your radio system and motor. There are three popular variations of Electronic Speed Controllers: one for brushed motors, one for brushless motors and one that can operate both.

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  • Fuel Tubing: A silicone tubing used to carry fuel from the fuel tank to the carburetor. Fuel tubing is also used to connect the pressure fitting on your pipe or muffler to the pressure fitting on your fuel tank.

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  • Head: The component which forms the top of the compression chamber of an engine.


  • Heatsink: Generally made from aluminum, a heatsink can be mounted to a motor, ESC, engine or any device that generates heat to help draw that heat away from crucial components.


  • Hump Pack:Refers to a battery pack configuration. Generally speaking a hump pack will have one or more cells mounted above the rest of the pack.

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  • mAh (Milliamp Hour): A measure of a cells capacity. The larger the number of milliamps the longer the battery cell will last.


  • Manifold: The manifold is a shaped tube that connects the exhaust port of your engine to the muffler or tuned pipe in your vehicle.

  • Memory:A phenomenon that degrades battery performance. It occurs in Ni-Cd batteries when they are repeatedly charged and not fully discharged. This can also occur with Ni-MH batteries to a lesser extent


  • MSC Mechanical Speed Controlbased on slot car controllers, a mechanical speed control uses a wiper system to regulate the current transferred from your battery pack to your motor.

  • Muffler This device muffles engine noise and increases the back pressure from the engines exhaust. Not as effective as a tuned exhaust system.

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  • Ni-Cd This abbreviation stands for nickel cadmium, the chemical compound used in rechargeable batteries.

  • Nitromethane Also known simply as nitro, this fuel source is used for the majority of 2-cycle RC engines.

  • P Return to Top


  • Peak Detection: Usually refers to a type of battery charger that automatically shuts off when a battery is fully charged.


  • Pro-Squat: The angle of the rear inboard suspension mounts when they are angled towards the front of the chassis.

  • R Return to Top


  • Receiver A device mounted into a car or aircraft that receives and decodes a signal sent by a transmitter. Servos, ESC and other devices are plugged into the receiver.


  • Rx: Abbreviation for receiver

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  • Saddle Pack: Battery pack shape in which the cells are split into two groups and connected with wire to fit certain vehicles.


  • Servo: A device that translates your transmitter inputs into movement of either the steering or throttle and brake systems in your vehicle.


  • span class="compound">Servo Arm: This arm connects the output shaft of your servo to a bellcrank, steering arm or carburetor.


  • Spin-Start A motorized mechanism that is used to start a nitro engine. The Spin-Start uses a wand that is inserted into both the engine backplate and the hand unit.

  • T Return to Top


  • Throttle-Return Spring A safety feature that plugs into your receivers that drives the servo positions to a preset location in the event that signal is lost.


  • Transmitter: What you hold to control your RC model. There are two different styles of controllers. One is referred to as a stick radio, has two sticks, used to control throttle and direction. The other is called a wheel radio and utilizes a small steering wheel to control direction, while a trigger is used for throttle, brakes and reverse. This is also referred to as a controller.


  • Tuned Pipe: A specialized muffler system that enhances the performance of a nitro engine.


  • Turnbuckle: A threaded link with a hex or square in the center that is used to adjust camber or toe-in.


  • Tx: Abbreviation for transmitter.


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