The acronym stops here.

4-in-1 ESC

A board containing the speed controllers for four motors. Check its ratings, connections, and compatibility.

Accelerometer

A sensor measuring acceleration. How its information is used depends on the controller and flight mode.

Acro / rate mode

A control mode in which pilot inputs command rotation rates rather than an automatic self-leveling attitude.

Analog video

A video system using analog transmission. Hardware settings, antennas, and receiver compatibility still need checking.

Angle mode

A self-leveling control mode in supported firmware. Its limits and behavior depend on configuration.

Antenna

A component used to transmit or receive radio-frequency energy. Frequency range, connector, mounting, and damage matter.

Arming

Enabling the aircraft’s motor-control state under its configured conditions. Arming is not a substitute for a preflight assessment.

Arming-prevention flag

Information explaining a condition that blocks arming. Match its meaning to the firmware version.

Balance charging

A charging method involving monitoring and managing individual cells in a compatible battery. Follow the charger and battery instructions.

BEC

Battery eliminator circuit: a voltage-regulation function used to power suitable electronics. Check actual output and device requirements.

Binding

The process used to establish the intended transmitter/receiver relationship, according to that system’s documentation.

Binding phrase

An ExpressLRS configuration method for establishing a binding relationship. Treat your own phrase as private setup data.

Blackbox

Flight-data logging in compatible systems. Supported hardware, configuration, and the installed firmware determine what is available.

BNF

Bind-and-fly product terminology. Read the exact contents and receiver/video compatibility rather than assuming a complete kit.

Connector polarity

The arrangement of positive and negative electrical connections. A fitting that mates is not proof of correct polarity.

Control link

The communication path carrying pilot commands from the radio to the aircraft’s receiver.

CRSF

A control/telemetry protocol used in compatible radio and flight-controller systems. Verify the implementation your hardware supports.

dBm

A unit expressing power relative to one milliwatt. A reported value needs context; it is not a stand-alone flying-distance limit.

Digital video

Video carried by a digital system. Distinct ecosystems and product generations are not universally interchangeable.

DShot

A digital motor-control signaling family used by compatible flight controllers and ESCs. Verify hardware and firmware support.

DVR

Digital video recorder. What is recorded, and where, depends on the equipment and recording method.

ESC

Electronic speed controller. It manages motor output in response to the control signal it receives.

Expo

An input-response shaping setting. Its specific interpretation depends on the software or radio using the term.

ExpressLRS

An open-source radio-control system. Exact hardware, frequency band, firmware, and regional requirements still matter.

Failsafe

The system’s configured response to specified control-link conditions. It must be understood and verified using official instructions.

Firmware

Software running on a hardware device. Correct device targets, versions, compatibility, and backups matter when updating.

Firmware target

The specific hardware target used for a firmware build. A similar-looking board name is not enough evidence to select it.

Flight controller

The onboard computer that combines sensor information and pilot commands to control the aircraft.

Flight mode

A configured aircraft-control behavior. The same pilot input can behave differently across modes and settings.

FPV

First-person view: seeing the view from an onboard camera, commonly through goggles or a display.

Frame

The aircraft’s supporting structure. Size, mounting patterns, clearance, and maintenance access all matter.

GND

Ground or electrical reference. Board-specific connection documentation still takes priority over a generic label.

GPS

A satellite-positioning system. Having GPS hardware does not automatically give an aircraft an appropriate rescue or autonomous-flight setup.

Gyroscope

A sensor measuring rotational motion. Its observations are part of the flight controller’s control process.

IMU

Inertial measurement unit: a sensor assembly measuring motion, commonly including gyroscopes and accelerometers.

Li-ion

Lithium-ion battery terminology. Chemistry, construction, protection, and application requirements vary by product.

LiHV

A battery designation with charging requirements that differ from ordinary examples. Never infer settings from a similar-looking pack.

LiPo

Lithium-polymer battery terminology used in the hobby. Follow the exact battery and charger manufacturer’s instructions.

LQ

Link quality. Learn how your specific control system reports it and what its warnings mean.

mAh

Milliamp-hours, a capacity unit. Compare energy using voltage too; capacity alone is not flight time.

Model match

An ExpressLRS feature relating a receiver connection to a selected model configuration. Check the official setup procedure.

Motor direction

The direction a motor turns. This must agree with the intended configuration and propeller installation.

Motor order

The relationship between a flight controller’s numbered motor outputs and the physical motors on the aircraft.

OSD

On-screen display: information overlaid on the camera view, such as supported battery or system information.

PID

A family of feedback-control terms. Tuning is not a replacement for correct hardware and basic setup.

Pitch

The aircraft’s forward/backward tilt axis. Pitch inputs affect both attitude and the direction of thrust.

PNP

Plug-and-play product terminology. Identify what is included, what is omitted, and which connections or configuration remain.

Polarization

A property of an antenna’s radiated field. Use compatible polarization as required by the video system.

Prearm

An additional arming-related condition or control where supported. Its behavior depends on the system’s configuration.

Propeller

A rotating aerodynamic component that produces thrust. Correct type, condition, direction, and installation matter.

Rates

Settings that shape how stick movement relates to commanded rotation. Keep a consistent practice setup while learning.

Return to home

An automated function in some systems. Capabilities, setup, limitations, and safe use vary; never assume it is present or ready.

Roll

The aircraft’s side-to-side tilt axis. Coordinated use with other controls shapes the flight path.

RSSI

Received signal strength indicator. Interpretation and scaling depend on the system; it is not a universal range prediction.

RTF

Ready-to-fly product terminology. Included equipment and remaining setup still depend on the particular package.

RX

Receiver. Identify whether a discussion concerns the control receiver or video receiving equipment.

S count

A common way to express the number of cells connected in series. It does not replace checking chemistry and product limits.

Simulator

A virtual environment for practicing control and procedures. Simulator progress does not certify a real aircraft or flight as safe.

SNR

Signal-to-noise ratio: a way to describe a signal relative to background noise. Read it in the context of the actual system.

Telemetry

Information returned from the aircraft or equipment to the pilot’s system, where supported and configured.

Throttle

The pilot’s thrust-related control input. Its effect on height also depends on aircraft attitude and other conditions.

Tiny whoop

A common hobby term for a small protected-prop aircraft style. Specific size, power, and intended use vary.

TRUST

The Recreational UAS Safety Test in the United States. Use the FAA’s current information for requirements and approved providers.

TX

Transmitter. In FPV discussions this may refer to radio-control or video equipment; make the context explicit.

UART

A hardware serial interface. Which pins, functions, and electrical requirements apply depends on the board.

VBAT

A common label referring to battery voltage. Its meaning at a connector or board pad must be checked in that hardware’s documentation.

Video link

The separate path carrying the camera view from the aircraft to the pilot’s receiving equipment.

Video receiver

The equipment that receives the aircraft’s video transmission for a display. It may be integrated or separate.

Visual observer

A person performing an observer role under the applicable operating rules. Read the requirements for your jurisdiction.

VLOS

Visual line of sight. Applicable requirements depend on the jurisdiction and operation; goggles do not automatically satisfy them.

Voltage sag

A drop in observed battery voltage under load. The amount depends on the battery, conditions, and demand.

VTX

Video transmitter: the aircraft-side equipment that sends the camera view to compatible receiving hardware.

Wh

Watt-hours, an energy unit. Nominal volts × amp-hours gives a useful label-based energy calculation.

Yaw

Rotation of the aircraft’s heading around its vertical axis.

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