2026 F1 Regulations Glossary: Every Technical Term Explained

The 2026 Formula 1 Technical Regulations introduce a significant amount of new technical vocabulary alongside the established terminology of the sport. This glossary covers the key terms used across the regulations and in coverage of the 2026 cars, from the aerodynamic modes to the power unit architecture, the materials framework, and the safety structures. Each definition links to the deeper explanations available in the full topic guides where relevant.

A

Accident Data Recorder (ADR)

A standard supply component mounted in the survival cell that records three-axis acceleration data and cockpit temperature in a rolling buffer. The ADR preserves post-impact data for medical teams assessing the forces a driver experienced. It is covered under Article 8.11 and supplied by the FIA to all teams on identical terms.

Active Aerodynamics

The system by which the front and rear wing elements of a 2026 Formula 1 car physically rotate to change their aerodynamic angle during a lap. Active aerodynamics replace the passive fixed-wing architecture of previous regulations and enable the two operating modes, X-mode and Z-mode, that are central to the 2026 performance concept. The ECU coordinates both wings to transition simultaneously. See the 2026 aerodynamics guide for full detail.

Advanced Sustainable Fuel (ASF)

The category of fuel mandated for 2026, derived entirely from non-fossil renewable sources. Permitted feedstocks include carbon captured from industrial processes combined with renewable hydrogen, non-food biomass such as agricultural residues and energy crops grown on marginal land, and municipal solid waste. The fuel must meet greenhouse gas reduction criteria under EU Renewable Energy Directive methodology before receiving FIA approval.

Aramid Fibre

A family of synthetic fibres including Kevlar and Twaron with exceptional resistance to sharp edge penetration and tearing. Aramid fibres are used in the prescribed laminate specifications for the halo (PL-HALO) and anti-splinter surfaces, where their energy absorption in impact scenarios differs usefully from carbon fibre’s behaviour.

B

Beam Wing

A secondary rear aerodynamic element that ran between the main diffuser and the rear wing on 2022-2025 Formula 1 cars, generating additional downforce and influencing the rear wing’s aerodynamic interaction with the underbody flow. The beam wing is deleted in 2026 as part of the rear aerodynamic simplification that enables the new three-element rotating rear wing design.

Brake-By-Wire (BBW)

The electronically controlled rear braking system that manages the interaction between the driver’s brake pedal input, the MGU-K’s regenerative harvesting torque, and the mechanical rear brake caliper pressure. Without brake-by-wire, the regenerative braking torque applied by the MGU-K during energy harvesting would create unpredictable brake balance behavior. BBW allows the system to deliver a consistent pedal feel to the driver while managing the two rear braking sources. See the 2026 drivetrain and brakes guide.

C

Carbon-Carbon Composite

A composite material using carbon fibre in a carbon matrix, distinct from standard polymer matrix carbon fibre composites. Carbon-carbon composites are used for brake friction materials in Formula 1 and are one of the specific exceptions listed in Article 15.5 to the general prohibition on certain exotic material classes.

Cost Cap

The annual spending limit established by the Financial Regulations, which sets a ceiling on each team’s Relevant Costs for designing, manufacturing, and operating their Formula 1 car. The cost cap was introduced in 2021. Enforcement is carried out by the FIA’s Cost Cap Administration through post-season audit of team accounts. Excluded from the cap are driver salaries above a threshold, power unit costs for customer teams, and marketing expenditure.

CVT (Continuously Variable Transmission)

A transmission type explicitly banned in the 2026 Technical Regulations. The prohibition covers any system that varies the gear ratio continuously rather than in discrete steps, and is broadly defined to prevent technical workarounds. All 2026 cars must use an eight-speed gearbox with fixed ratios.

D

Delta State of Charge (Delta SoC)

The change in the Energy Store’s stored energy level from the beginning to the end of a lap. The 2026 regulations cap the delta SoC at 4MJ per lap, meaning the energy store cannot gain or lose more than 4MJ of stored energy in a single lap. This limit prevents teams from using the energy store purely as a fuel supplement by continuously drawing it down, or purely as an energy accumulator by always harvesting more than they deploy.

Diffuser

The rear underbody section of a Formula 1 car that expands the airflow extracted from beneath the car, creating the low-pressure region responsible for a significant portion of the car’s aerodynamic downforce. In 2026, the diffuser works without the beam wing above it for the first time since the ground effect era, changing the interaction between diffuser flow and rear wing aerodynamics.

DRS (Drag Reduction System)

The overtaking aid used from 2011 through 2025, which allowed the driver to open a flap in the rear wing when within one second of the car ahead in a designated activation zone. DRS is replaced in 2026 by active aerodynamics and the proximity-based MGU-K override system. The active aero system delivers a more comprehensive drag reduction across the entire car rather than just the rear wing, while the overtake override provides the following car’s driver with additional electrical power rather than simply reduced drag.

E

ECU (Electronic Control Unit)

The FIA-mandated standard supply unit provided by McLaren Applied Technologies to all teams. The ECU is the central processor through which all driver inputs and all car system outputs pass. It manages power unit modes, active aerodynamic transitions, the overtake override proximity system, data acquisition, and the driver information display. Teams write their own software applications that run on the common hardware. See the 2026 electronics guide.

Energy Recovery System (ERS)

The collective term for the electrical energy harvesting and deployment systems on a Formula 1 car. In 2026, the ERS consists of the MGU-K, the Energy Store, and the power electronics connecting them. The MGU-H that was part of the ERS from 2014 to 2025 is deleted in 2026. Maximum harvest is capped at 9MJ per lap.

Energy Store (ES)

The battery system that stores electrical energy harvested by the MGU-K and releases it for deployment. The Energy Store operates within a defined state of charge window, with the 4MJ delta SoC limit and 9MJ per-lap harvest cap governing how it is charged and discharged. Dielectric cooling maintains the cells at approximately 50°C operating temperature.

F

FIA (Fédération Internationale de l’Automobile)

The governing body of Formula 1 and international motorsport, responsible for writing and enforcing the Technical Regulations, Sporting Regulations, and Financial Regulations. The FIA is a not-for-profit association of national motoring clubs. It is institutionally separate from Formula 1 Management, the commercial rights holder.

Floor

The underside of the Formula 1 car between the front axle and the diffuser, which generates a significant portion of the car’s total aerodynamic downforce through ground effect. In 2026, the floor is 150mm narrower than the 2025 specification and the venturi tunnels used in the 2022-2025 ground effect design are removed, reducing total underfloor downforce as part of the overall 30% downforce reduction target.

Fuel Flow Limit

The maximum rate at which fuel energy may enter the combustion chamber, set at 3000 MJ/h in the 2026 regulations. This figure is expressed in megajoules per hour rather than kilograms per hour to account for the varying energy density of different sustainable fuel compositions. Compliance is monitored through the homologated Gill fuel flow sensor.

G

Gearbox

The eight-speed sequential transmission that converts engine output into rear wheel torque. The 2026 Technical Regulations require exactly eight forward gears, prohibit continuously variable transmissions, and classify the gearbox as a structural member of the chassis. Gear ratio selection is determined by the team but must be homologated before the season. See the drivetrain guide.

H

Halo

The titanium overhead protection structure mandated since 2018 that surrounds the top of the cockpit opening. The halo is designed to deflect large debris and withstand vehicle contact loads in rollover scenarios. In 2026, the halo specification is updated but the fundamental architecture continues. It is one component within the broader layered safety structure described in the 2026 safety guide.

Homologation

The formal approval process by which the FIA certifies that a component or system meets the required specification. Homologated components must not be changed after approval without re-homologation. In 2026, the gearbox, power unit, and certain safety structures are subject to homologation requirements that limit development during the season.

I

ICE (Internal Combustion Engine)

The 1.6-litre V6 turbocharged combustion engine that forms half of the 2026 power unit. The ICE produces approximately 400kW of peak mechanical output in 2026, targeted at contributing roughly half of the car’s total peak power. The other half comes from the MGU-K’s 350kW electrical contribution.

Intermetallic Alloy

A material with an ordered atomic structure, distinct from conventional alloys where atoms are arranged randomly. Intermetallics offer very high stiffness at elevated temperatures but are typically brittle. They are prohibited under Article 15 for most chassis applications due to cost and handling concerns, with a specific exception for titanium aluminide (TiAl) valve material inside the power unit perimeter.

L

Lift-off Regen

The automatic energy harvesting triggered when a driver lifts off the throttle. The MGU-K begins extracting kinetic energy from the drivetrain, and simultaneously the ECU commands the active aerodynamic system to begin transitioning toward Z-mode. The coupling between energy harvesting and wing transition creates a trade-off between the timing of the lift, the amount of energy recovered, and the aerodynamic drag incurred during the transition.

Listed Technical Component (LTC)

A component category under Article 17 covering parts that a team designs and owns exclusively. Listed Technical Components are the primary vehicle for competitive differentiation in Formula 1, covering the chassis structure, suspension geometry, aerodynamic surfaces, and the majority of mechanical and structural components on the car.

M

MGU-H (Motor Generator Unit, Heat)

The motor generator connected to the turbocharger shaft, present in Formula 1 from 2014 to 2025. The MGU-H harvested energy from exhaust-driven turbocharger rotation and could also spin the turbo electrically to eliminate lag. It is deleted in 2026 due to its cost and complexity being a barrier to new power unit manufacturers entering the sport.

MGU-K (Motor Generator Unit, Kinetic)

The motor generator connected to the drivetrain. In 2026 its maximum output increases from 120kW to 350kW, making it the largest single source of peak power on the car. The MGU-K both harvests energy during deceleration and deploys stored energy during acceleration. Its rampdown from 290km/h to zero contribution at 355km/h is enforced by the ECU.

Monocoque

The structural chassis tub that forms the central load-bearing structure of a Formula 1 car. The monocoque contains the cockpit, the fuel bladder, and the attachment points for the suspension, engine, and crash structures. In 2026, the monocoque must be manufactured from the prescribed and homologated carbon fibre laminate specifications defined in Article 15.6 and must pass the crash test requirements of Article 13.

O

Open Source Component (OSC)

A component category under Article 17 for which the design specification is published and freely available to all teams. Open Source Components allow teams to use the same component design without intellectual property restrictions, reducing development cost in areas where competitive advantage is not the primary consideration.

Overtake Override

The 2026 replacement for DRS. When a car is within one second of the car ahead in a designated zone, the driver can activate the MGU-K’s full 350kW output up to 337km/h (compared to the standard rampdown starting at 290km/h). Each activation costs 0.5MJ from the energy budget. The ECU verifies proximity and zone conditions before granting the override.

P

PAN Precursor

Polyacrylonitrile, the standard precursor material from which structural-grade carbon fibre is manufactured. The 2026 Technical Regulations permit only PAN-based carbon fibres for composite structures, excluding pitch-based fibres. The regulations cap permitted fibre grades at a tensile modulus of 550GPa and tensile strength of 7100MPa.

Power Unit (PU)

The complete propulsion system in a 2026 Formula 1 car, comprising the Internal Combustion Engine, the MGU-K, the Energy Store, the turbocharger, and their associated electronics, fuel, and lubrication systems. The PU perimeter is a regulatory boundary within which specific material and design rules apply that differ from the rest of the car. See the 2026 power unit guide.

Prescribed Laminate

A specific carbon or aramid fibre laminate construction defined by designation in Article 15.6 that must be used in specified applications. Prescribed laminates include PL-HALO (a KC60, CC100, KC60 stack for the halo structure), PL-HEADREST (two layers of KC60 for the headrest area), and anti-splinter laminates for surfaces adjacent to the driver.

R

Rampdown

The progressive reduction of MGU-K electrical output between 290km/h and 355km/h, where contribution reduces to zero. The rampdown prevents the MGU-K from delivering its full 350kW at very high speeds, addressing both energy budget management and the handling implications of sudden high torque at maximum velocity. The rampdown characteristic is enforced by the ECU and cannot be reprogrammed by teams.

Reference Volume

A defined three-dimensional space within which aerodynamic surfaces in 2026 must be contained. The bodywork regulations use reference volumes to define permitted aerodynamic surface locations rather than specifying exact shapes, giving teams design freedom within the constrained space. The active aerodynamic system’s rotation mechanism must also comply with reference volume requirements in both X-mode and Z-mode positions.

S

Standard Supply Component (SSC)

A component supplied by a single FIA-appointed manufacturer on identical technical and commercial terms to all teams under Article 17. Standard Supply Components include the ECU, fuel flow sensors, FIA cameras, the Accident Data Recorder, timing transponders, and rear lights. Teams cannot modify SSCs or substitute proprietary alternatives performing the same function.

Survival Cell

The reinforced central structure of the monocoque that must protect the driver in a crash. The survival cell must pass a comprehensive crash test programme defined in Article 13, including static load tests on the front wall, cockpit side panels, cockpit floor, and fuel cell sides. Each panel has a minimum homologated load requirement. See the safety regulations guide.

Sustainable Fuel

The 100% non-fossil fuel mandated for 2026. The fuel must be certified as meeting greenhouse gas reduction criteria and must be produced from approved renewable feedstocks. The fuel specification in Article 16 sets the physical property and compositional limits within which sustainable fuel blends must fall.

T

Telemetry

The wireless data transmission system covered by Article 8.6 that sends the car’s sensor readings to the pit wall in real time. Telemetry gives engineers a live picture of power unit state, tyre condition, energy management, and system temperatures during a session. The standard ECU manages the data acquisition and transmission function.

Transferable Component (TRC)

A component category under Article 17 for parts designed by a Supplying Competitor (typically a works team) that can be supplied to other teams. Power units purchased by customer teams are the most significant example of transferable components. The supply terms must meet the parity requirements set out in the regulations to prevent a supplier from deliberately providing inferior components to competitors.

X

X-Mode

The low-drag configuration of the 2026 active aerodynamic system, in which the front and rear wing elements rotate to shallow angles to minimize aerodynamic resistance. X-mode is the default state during straight-line acceleration, maximizing the speed achievable from the available power. The car transitions out of X-mode into Z-mode automatically when the driver lifts off the throttle.

Z

Z-Mode

The high-downforce configuration of the 2026 active aerodynamic system, in which the front and rear wing elements rotate to their maximum angles to generate peak aerodynamic load for cornering. Z-mode is triggered automatically on throttle lift and maintained through cornering phases. The transition between X-mode and Z-mode is managed by the ECU to ensure front and rear wings move in synchronization.