Carbon Fiber Rear Wing for a 2014 Toyota Prius (Feb 2026 - Aug 2026)

My prius was boring, so I made it cooler with a wing that is predicted to produce approximately ~422 N of downforce at 80 mph, designed around a Selig S1223 airfoil at a 10 degree AoA. Drag added from the wing is predicted to be ~84 N at 80 mph. All values according to CFD.

Features:

• CD = 0.391

• CL = -0.584

• L/D = -1.49

• 2 layers of plain weave carbon fiber hand laid over a high density XPS foam core in the shape of a Selig S1223.

• Machined aluminum endplates on either side to reduce tip vortices and to keep the pressure differential.

• Waterjetted 6061-T6 uprights.

• Total weight: 5.5 lb

• Airfoil: Selig S1223

• Composite: 2 layers of carbon fiber, wet layup, air cured

• Endplates & uprights: 6061-T6 aluminum

Everything designed and assembled in Fusion 360

CFD pressure pathlines over the wing display an expected high pressure above and low pressure below, creating a pressure differential that promotes downforce. Wing tip vortices are controlled as expected with the installed endplates. All done in a watertight workflow using ANSYS Fluent 2026 R1. This is my first experience with CFD and I am excited to use this tool for future projects.

FEA validated a 2x factor of safety, safe in all regards and can withstand the predicted downforce.

Miscellaneous Photos