React the difference in travel between the two rear wheels, raising rear roll rate and moving lateral load transfer distribution rearward.
A tube twisting in torsion between the two actuating blades. Its torsional stiffness acts in series with the blade bending stiffness, so the total contribution to roll rate is set by both. Design Philosophies and Processes: Sized so that the nominal middle blade setting reproduces CR22's maximum rear ARB stiffness, with adjustment available in both directions from there.
Contribution to roll rate at nominal: 1160 lb-in/deg, which is 96.7 lb-ft/deg. Front roll rate 213.89 lb-ft/deg, rear 298.79 lb-ft/deg.
AISI 4130 steel. From the cost report drawings and CAD: From the cost report drawings: Al-6061T6 (CR25_SUS_RearARBBlade); AISI 4130 Steel (CR26I_RearARBTubeInserts).
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.
0.5 in OD, 0.33 in ID, torsional stiffness 68.12 lb-in/deg. From the cost report drawings and CAD: Dimensions called out on the cost report drawings. These are the figures printed on the drawing, not a labelled specification; open the drawing itself for what each one refers to. Rear ARB Torsion Bar (as drawn): 4.76, 0.19, 3.18, 0.13, 63.23, 2.49, 64.712.55, 5.01, 0.20, 414.83 CR25_SUS_RearARBBlade (as drawn): 19.05, 1.91, 160.53, 16.05, 2.41, R0.24 CR26I_RearARBBlade (mm): 19.1, 11.4, 160.5, R2.4 CR26I_RearARBTubeInserts (mm): 34.9, 10.2, 6.4, 8.5, 12.7 Source: Cost report drawings: CR22/Suspension/Design/01_Cost_Report/Cost Report Drawings/Suspension & Shocks/Rear ARB Torsion Bar/Rear ARB Torsion Bar.pdf; CR25/Suspension/Management-Comp/Cost Report/Drawings/Sus Shocks - Rear ARB Assembly/CR25_SUS_RearARBBlade.pdf; CR26i/Suspension/Competition/Cost Report Drawings/Suspension and Shocks/Rear ARB Assembly/CR26I_RearARBBlade.pdf; CR26i/Suspension/Competition/Cost Report Drawings/Suspension and Shocks/Rear ARB Assembly/CR26I_RearARBTubeInserts.pdf
Nothing in CrimsonStorage covers these yet.