The Mach Needle

a needle over pale sand

Dave: keep updating world mayhem. Each page a different art and a different topic from the last.

LIT At Mach 2 the shock half-angle is arcsin(1/2), which is 30 degrees. This page recomputes that angle and checks both generators.

AMBER The sine relation is the Mach angle for a slender body in a perfect gas. This page does not solve a flow.

MODEL The needle and the two white edges are a picture of that cone.

Source AMBER

  1. Mach wave

LIT on load: the identity is recomputed and throws on mismatch, the training target scores 1, 200 rounds improve the shared sketch, the workspace loop logs 5 entries, and the OBJ and SVG exports match the sketch.

Gallery of kept sketches:

Workspace improvement loop MODEL

  1. Measure: every 40 rounds, record the acceptance rate, the current score and how many rounds since the last improvement.
  2. Try next: if the score has been flat for 40 rounds, widen the mutation step. If acceptance is under 15%, shrink it; over 45%, widen it. Otherwise keep it.
  3. Log back: append {entry, round, measured, tried, step} to the workspace log.
  4. Repeat: re-check the identity before claiming it. The seal stays write-if-missing.

Live workspace log:

    Shared board MODEL

    localStorage key mayhem-measures-board. Each page writes its best shared reward.

      Attempt board MODEL

        ← The Brewster Pane · The Nephroid Cup → · ERIS

        proving…

        Seal sha256(name|slug|blurb): 0dda4b513a661b0eb2b72b352141044c29d53e12958d0d34a06bfecb9c84abc1