# v0.0.4 - March 2026 Be aware - this is a preview version and as such there are known limitations and simplifications in the software and models used. However, it should still be useful as a tool to understand some basic concepts and how setup changes influence them. ## New Features The application structure is now changed so that each setup is stored under a race event and a specific run. You can enter and store relevant information about each and arch run, helping to keep track of what changed between runs and setups. A basic help system is now also in place. ## Improvements Baselines can now be named as you wish when you export them. The Schumacher Mi9 has more accurate measurements. ## Known limitations ### Vehicle dynamics - Suspension system - only traditional designs with a standing shock and spring mounted to lower control arm is supported, no systems with rockers or torsion springs are supported (yet) - ARB (Anti Roll Bar) stiffness - the current method is on the simple side, while based on a few real life experiments on ARBs handy to the developer many more samples and models of ARBs should be measured with a view to tune the math, especially how the angle and length of the lever arms of the bar, and the ratio between the torsion bar portion and the lever bar portion, influence the overall stiffness. As you understand from that, only simple / traditional steel bars with two bends models are currently supported. - Damping Ratio - the damping ratio is currently calculated based on an average corner mass on the axle at play, since in real life each corner tends to carry different mass (think weight) this should be considered when calculating the damping ratio and a left/right number should be presented. - Damping Ratio #2 - the damping coefficient (N·s/m) use an empirical constant (k_empirical * oil_viscosity_cst / total_hole_area_mm2), this constant needs a lot more real life experiments to reflect the true damping coefficent across cambinations of oil viscosity and piston hole areas. - Pitch stiffness - introduce a pitch stiffness metric, or Nm per deg of nose-up/nose-down rotation - Aero - some classes of RC cars are heavily influenced by their aero profile and the downforce generated, influencing suspension dynamiccs massively. A future version should therefore make an effort to incorporate aero dynamic effects. ### Software application - Suspension graphics on Windows is... not pretty. The lack of anti aliasing on Tkinter/Windows is a bummer, needs to be replaced with a framewrok that supports it properly. - Suspension simulation should be possible to run both front and rear with one command ## Known bugs: - Negative droop (wheel axle below chassis) does not work - Spring is rendered too wide subject to shock body width, it should adjust with the shock body width - Track width should be calculated from suspension geometry and wheel's measurements