The structural shell the driver and the seat insert sit in.
Provides the base geometry the insert is molded against, and carries the driver's weight into the frame.
No part-specific design process is documented. The Ergonomics subsystem design process applies: 1. Take driver body measurements and place them against the ergonomics study ranges. 2. Mold the seat insert to the driver in the car with expanding foam, then hand post-process and cover. 3. Set headrest and harness mounting to the rules and to the driver's shoulder height. 4. Run a simulator or on-track endurance stint and measure fatigue with EMG. 5. Iterate the insert shape at the identified pressure and support points.
Validation has historically been by lap delta, which the one-pager says has "more than proven the need for a seat", plus driver feedback and weight.
CR22 logged time per seat: 1 hour of prep, 1 hour to pour and cure, 2 hours to refine and post-process. CR22 materials: mattress bag $12.99, two-part foam mix $75.99, tape $9.58. The CR25 design added a solid carbon back to decrease seat profile and increase stiffness, with the same two-part foam mixture retained because the alternative Creafoam product costs $380 for a 25 gallon bag.
CFRP, Nomex sandwich panel on CR26I.
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.
Chassis weight breakdown: CR25 3.300 lb, CR26E CAD 2.436 lb. CAD mass, CR26E master assembly: 2.436 lb (1.105 kg). CG at X 51.95 in, Y 0.00 in, Z 11.99 in in vehicle coordinates. Source: CR26E/Systems/03 - Mass Model/ChassisWeightBreakdown.xlsx | SolidWorks mass model exports: CR22 (5 May 2024), CR25 (4 Jul 2025), CR26I (30 Jul 2025), CR26E (22 Mar 2026) Quantity per car, as costed: 1
Nothing in CrimsonStorage covers these yet.