kendama op• Data kinds: none → any (an op determined by its arguments alone — it takes no image or data input)
• Call: import fullseye as fs; fs.ledger.tether_slack_angle(theta0: 'float', L: 'float', g: 'float' = 9.81) (to call the implementation directly, import kendama; kendama.tether_slack_angle(theta0: 'float', L: 'float', g: 'float' = 9.81); from the registry, opsdrive.get("tether_slack_angle"))
Angle θ_s (from straight down) at which the string goes slack for a ball with speed v₀ = √(2gL(1 − cos θ₀)) at the bottom (the energy at which a rod would stop at θ₀).
> The detailed description below is the original text — the summary and the headings are translated.
導出: v² = 2gL(cos θ − cos θ₀)、T = m(v²/L + g cos θ) = m g (3 cos θ − 2 cos θ₀) = 0 → cos θ_s = (2/3) cos θ₀。上半分(cos θ_s < 0)に達するのは cos θ₀ < 0 ⇔ θ₀ > π/2 のときだけ。θ₀ ≤ π/2 なら張力は θ₀ で m g cos θ₀ ≥ 0 まで下がるだけで弛まない → None。θ₀ = π(頂点にちょうど届くエネルギー)で θ_s = arccos(−2/3) = 131.8°。θ₀ ∈ (0, π] 以外は ValueError。θ₀ > π/2 の玉を静止から放すと最初から弛む(張力 m g cos θ₀ < 0)ので、θ₀ は真下での速さで与える。
• Sample-data catalog (download URLs / licences) — 2-D uses skimage.data (BSD/public domain) plus synthetic images; 3-D lists download URLs for real data sources (Stanford, PDS, …).
• Operator provenance and references — the sources of the research/methods this op family came from.
• The canonical algorithm (author, year) and its uses are named in the family usage guide above.
• poc_kendama — py -3.11 examples/poc_kendama.py
any as input)course_crank · course_s_curve · course_turnaround · course_slope · course_intersection · course_parallel_parking · course_crossing · course_road
kendama)kendama_params · elliptic_k_agm · pendulum_period_exact · pendulum_launch_speed · pendulum_rod_simulate · tether_tension_fixed · swing_up_plan · swing_up_apex
*Provenance: kendama.py — DRIVE operator registry. This per-op note is generated by tools/opdocs.py md (do not hand-edit).*
© 2026 Kazufumi Furuse — Fullseye operator documentation. Licensed under Apache-2.0.