{ "id": "crankbait-ballast-v1", "published": "2026-11-01", "applicationVersion": "0.1.0", "computationalSourceSha256": "3fbbca41f135b8fba2eca3d57b126580968979d0faf4ea4cd39a02c62a544586", "generatorSourceSha256": "56dd2671405079499c34a0ce76f81b5669b64f981c5381567d63642a786b035d", "fingerprintDirectories": [ "src/core", "src/geometry", "src/mass", "src/sim", "src/manufacture" ], "presetId": "crank_square", "method": "fully-submerged-static-mass-and-buoyancy", "massModel": "as-built", "waterDensityKgM3": 998, "gravityMS2": 9.81, "coordinateSystem": "Body frame, nose origin, +x forward, +y left, +z up; reported centres are in millimetres.", "netBuoyancyMeaning": "Buoyancy minus weight when fully submerged. netBuoyancyG is the equivalent force divided by gravity in grams; positive tends to rise, negative tends to sink.", "classificationThresholdsG": { "floating": "> 0.5", "slow_floating": "> 0.1 and <= 0.5", "suspending": ">= -0.1 and <= 0.1", "slow_sinking": ">= -0.6 and < -0.1", 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"noseBluntness": 0.85, "tailDepth": 0.3, "tailWidth": 0.32, "dorsalBias": 0.15, "flatSide": 0.25, "noseDrop": -0.08, "noseCupDepth": 0 }, "lip": { "enabled": true, "shape": "square", "length": 11, "width": 15, "thickness": 1, "angle": 70, "rootStation": 5, "rootHeight": -0.8, "material": "PCB_FR4" }, "lineTie": { "mount": "nose", "lipFraction": 0, "station": 2, "heightFraction": -0.3, "lateralOffset": 0 }, "shell": { "hollow": true, "wallThickness": 1.2, "material": "ASA", "coating": "EPOXY", "coatingThickness": 0.15 }, "ballast": [ { "id": "b1", "material": "TUNGSTEN", "diameter": 6.5, "station": 19, "heightFraction": -1, "count": 1 } ], "rattles": [ { "id": "r1", "station": 34, "heightFraction": 0, "ballDiameter": 4, "material": "STEEL", "count": 2 } ], "hooks": [ { "id": "h1", "station": 24, "position": "belly", "type": "TREBLE", "size": 6, "splitRing": 2 }, { "id": "h2", "station": 60, "position": "tail", "type": "TREBLE", "size": 6, "splitRing": 2 } ], "joints": { "segments": 2, "positions": [ 0.6 ], "gap": 1.2, "maxAngle": 30, "style": "pin_hinge", "pinDiameter": 1.2 }, "soft": { "material": "PLASTISOL_MEDIUM", "saltPercent": 8, "tail": "paddle", "paddleHeight": 14, "paddleWidth": 12, "paddleThickness": 3, "stemLength": 10, "stemThickness": 4.5, "paddleAngle": 0, "rig": "jighead", "rigWeight": 5, "rigMaterial": "TUNGSTEN", "hookSize": -1, "simSegments": 10 } }, "print": { "hardMode": "split_halves", "clearance": 0.25, "alignmentPins": true, "throughWire": true, "wireDiameter": 1, "moldMargin": 10, "layerHeight": 0.16 }, "sharePath": 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} ], "limitations": [ "Static numerical mass and buoyancy estimates, not a physical print or water test.", "No dynamic swim simulation, sinking speed, float attitude, diving-depth or catch-performance result is reported.", "Each ball diameter rebuilds its pocket and internal printed support; the mass change is not only the added tungsten.", "The ball remains at the same station and relative height input; its absolute placement and the complete centre of mass can change.", "Displaced volume is the modelled fully submerged exterior including the modelled coating, lip and hooks; a floating lure displaces only its own weight at equilibrium.", "Actual filament density, slicer settings, coating, glue, hardware, water density and water ingress can change the finished result.", "Read-only snapshots contain the owned preset and the same print settings. Their preset swim controls are for exploration and were not evaluated in this evidence package." ] }