# Rear wing placement (height and fore-aft)

> Where should a rear wing be mounted on a car?

- Category: Car design › Car aero
- Kind: Standard part
- Basis: Design rules and figures from the cited sources; example geometry by Xem Studio
- Page: https://xemstudio.com/objects/rear-wing-placement/ · JSON: https://xemstudio.com/api/geometry?object=rear-wing-placement · Plain text: https://xemstudio.com/objects/rear-wing-placement/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); files Xem Studio Design License (free to use and sell from, not to redistribute as files: https://xemstudio.com/license/)
- Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/)

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- HPA's starting point is to put the forward third of the wing over the boot and the rear two-thirds behind it, with the leading edge level with the roofline seen from the front.
- Higher and further rearward gives more rear aero balance; lower positions interact with the body and floor but too low puts the wing in the cabin wake and performance drops substantially (HPA).
- RC classes constrain this by rule: touring-car wings must stay below the roofline (AARCMCC).
- The file is a reference example built by Xem Studio from the numbers above (Reference wing as in single-element entry.). Sizes the sources do not fix are illustrative; scale the example to your own vehicle.

## Sizes

| parameter | value or range | source |
|---|---|---|
| Fore-aft starting point | front 1/3 over boot, rear 2/3 behind | HPA rear wing |
| Height starting point | leading edge level with roofline (front view) | HPA rear wing |
| RC touring car wing height | must be lower than the roof line | AARCMCC |
| RC touring car rear overhang | max 10 mm beyond body incl. bumper | AARCMCC |

## Where the files are

- High Performance Academy: [Aerodynamic performance devices for club level cars: rear wing theory](https://www.hpacademy.com/courses/aerodynamics-fundamentals/aerodynamic-performance-devices-for-club-level-cars-rear-wing-theory) — web — Publisher's page; dimensions are facts
- AARCMCC: [Section 3: Electric On Road, Technical Rules (Oct 2006)](https://www.rctech.net/forum/attachments/australian-racing/180184d1162811203-aarcmcc-online-tech-road-oct-06.pdf) — web — Publisher's page; dimensions are facts

## Free STEP/STL (1 parts, Xem Studio Design License, Xem Studio)

Index: https://xemstudio.com/files/hardware/rear-wing-placement/index.json · license: https://xemstudio.com/files/hardware/rear-wing-placement/LICENSE.md

- rear-wing-placement-rear-wing: [STEP](https://xemstudio.com/files/hardware/rear-wing-placement/rear-wing-placement-rear-wing.step) · [STL](https://xemstudio.com/files/hardware/rear-wing-placement/rear-wing-placement-rear-wing.stl) — single rear wing: span 1600 × chord 250 mm at 6°, endplates 300 mm, inverted NACA 4412 section (mounts from below)

## Questions

**Is higher always better?**

Higher gets cleaner air, but rules often restrict it; lower positions add interaction but risk the cabin wake (HPA).

## Fits with

- [Single-element rear wing (race car)](https://xemstudio.com/objects/rear-wing-single-element/)
- [Dual-element (two-element) rear wing](https://xemstudio.com/objects/rear-wing-dual-element/)
- [Swan-neck rear wing mount](https://xemstudio.com/objects/swan-neck-wing-mount/)
- [Gurney flap / wickerbill](https://xemstudio.com/objects/gurney-flap-wickerbill/)
- [Wing endplates / side dams](https://xemstudio.com/objects/wing-endplates/)
- [Front splitter](https://xemstudio.com/objects/front-splitter/)