Fourth element in the front wing stack.
Adds downforce at the cost of drag. CR26E's low-drag setup study deleted the fourth element entirely (Iter011: overall CLA 3.095, CDA 1.411, FW CLA 1.192) against the baseline (CLA 3.233, CDA 1.439, FW CLA 1.339), which quantifies what this element is worth.
No part-specific design process is documented. The Front wing subsystem design process applies: 1. 2D CFD sweeps in ANSYS to place elements and set angle of attack cheaply. CR26E ran 153 two-element and 148 three-element sweeps for the rear wing on the same method. 2. Move promising 2D results into a 3D half-car model at 35 mph, chosen as a representative competition corner speed. 3. Iterate in the half-car model, tracking CLA, CDA, CoP and tire drag in an iteration tracker. 4. Run the best candidates in the performance map (PMAP) full-car model for yaw, roll and cornering. 5. Validate on track with constant-speed testing, tufting and Flo-Vis oil.
Infused in a tooling board mold milled on the 5-axis gantry, or laid up on a 3D printed mold for smaller parts. Endcaps, spars and skins are made independently and bonded in 3D printed jigs with glass alignment beads controlling bond gap.
CFRP.
None recorded. This part has no entry in Knowledge_Transfer/Issue Logging/Fault Vault.xlsx, in either Issue Log.xlsx, in CR22/Issue Tracking/Shakedown 7-15-23.xlsx, or in any design review issue list found in CrimsonStorage or Box.
Nothing in CrimsonStorage covers these yet.