We have released RumiCar Simulator v8.1.1. The release notes below are also available on GitHub.
v8.1.1
The physics notes and the in-app design Q&A now draw a sharper line around what is still unmeasured (a documentation fix only — neither the physics nor any measured result changed). For wall-bounded tight hairpins we used to write that “genuinely transient lines, such as a multi-point turn or braking to shorten the effective radius, are still unmeasured”. Those two are not on the same footing. Only the multi-point-turn line is still unmeasured; braking to shorten the effective radius cannot get through these cells in principle, because the minimum turning radius is “wheelbase / tan(max steering angle)” — a floor that does not depend on speed — so slowing down never takes the car inside it (in 6 of the 8 impossible cells the corridor’s outer radius is below that floor). Braking can rotate the car, but that means letting the tyres slip, which belongs to the “shallow slip” result we already measured. The old wording could be read as “trying braking might change the answer”, which is why it was corrected.
Verifying this release yourself
cd Simulator
node wf_run_all.mjs # the full assertion-gate suiteThe suite runs from a fresh clone with no dependencies beyond Node.js.
The real-browser checks under Simulator/browser/ additionally need npm install and a display.