A rear wing turns airflow into downforce, the grip that lets a race car corner faster. Build a single, two, or three-element inverted wing entirely in your browser. No CAD, no engineering degree.
A rear wing is an upside-down aeroplane wing. Flip a wing over and instead of lifting, it presses down, pushing the car into the track. That downward push is downforce, and it lets a car carry more speed through a corner without the tyres letting go.
It always comes with a cost in drag, the force that slows the car on the straights. Good wing design is the trade between the two, described by a lift coefficient (how much vertical force) and a drag coefficient (the penalty). You balance them as you design, and when you want real numbers, the built-in XFOIL and CFD tools solve them for you.
A single airfoil can only be tilted so far before the flow separates and the wing stalls. Splitting it into elements with small gaps lets you deflect the air much further while keeping the flow attached, which is why fast cars run multi-element rear wings.
The narrow channel between two elements is the slot gap. Fast air from below the leading element is funnelled through it onto the trailing element, delaying separation so that element works harder than it ever could alone.
The gap and overlap are sensitive (a few millimetres change the result), so they are first-class parameters with a live preview, projected exactly through to simulation.
Modifiers reshape the wing beyond its profile and angle, and each one applies to the parametric model, so what you export and simulate is exactly what you see.
Twist varies the angle of attack along the span. Easing the tips off (washout) shifts load inboard, which can tame tip stall and tune how the wing works with its endplates. Apply it to any element and the geometry updates, ready to export or simulate.
Curvature bends the wing along its span instead of running it dead straight. Use it to follow bodywork, meet packaging or regulations, or reshape the spanwise loading, and like every modifier, it acts on the parametric model, so the export and the simulation match exactly.
No installation, no CAD. You work in the language of aerodynamics (airfoil, chord, span, angle), and the 3D model is built for you.
A design is only useful if you can make it. Export your wing as a STEP file for any CAD package and CNC workflow, or as an STL for 3D printing and meshing. Both exports are free and carry the exact geometry (every element, slot gap and endplate), so the part you hold matches the part you simulated. This is the bridge most free tools skip: idea to manufacturable file in one sitting.
The Wing Designer is the hub of a connected toolchain. The same project you draw can be analysed without redrawing anything.
Send a wing to XFOIL for a fast polar sweep: lift and drag across a range of angles, plus Cp and boundary-layer detail. For higher fidelity, send it to the 2D CFD pipeline, which solves the actual flow field with OpenFOAM and returns pressure, velocity and streamline renders in a PDF report. Design, simulate, refine and export without leaving the browser.
Formula Student and FSAE teams design and iterate rear wings on a student budget, export STEP files for manufacturing, and back up aero decisions with simulation in design reports. Motorsport hobbyists and track-day builders design wings for their own cars without a CAD seat or a wind tunnel. Engineering students and the curious see how multi-element wings, slot gaps and angle of attack actually change the numbers, learning aerodynamics by building, not just reading.
And it isn't downforce-only: aviation and RC enthusiasts can flip the wing into lift orientation then design and simulate a conventional lifting wing with the same tools: the same airfoils, geometry and XFOIL/CFD analysis, just working the way an aeroplane wing does.
Single, two, or three-element. Live 3D preview. Free STEP and STL export. No install, no CAD.
Open Wing Designer for free