{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.keel-q1646730","code":"thing-q1646730","url":"https://ver.cy/models/thing/q1646730/","name":"keel","alternateNames":[],"kind":"thing","status":"research-draft","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Information and virtual systems","entryKind":"thing","plane":"INF","domain":["INF.MED"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"In its usual nautical sense, a keel is a principal longitudinal structural member at the bottom of a vessel's hull, or a fixed underwater appendage that provides lateral resistance and may carry ballast.","purpose":"Enable an agent to identify a keel, assess its attachment and condition, and determine which inspection, maintenance or operating decisions its documented configuration supports.","scope":{"in":["Keel configuration and its relationship to a particular hull","Keel geometry, materials and ballast distribution","Hull attachment and transfer of keel loads","Position, actuation and locking of movable keels","Keel damage, inspection evidence and repair history"],"out":["Whole-vessel stability certification and loading plans","Rudders, centreboards and other separately identified appendages","Hull structure beyond the keel attachment interface","Navigation, tidal prediction and passage planning","Biological structures, creative works and other entities named keel"],"boundaries":[]},"distinguishingFeatures":["Identify a physical vessel component through drawings, installation evidence or inspection, rather than through the word keel alone.","Establish whether its documented role is longitudinal hull structure, hydrodynamic resistance, ballast carriage or a combination; the nautical term covers differing functions. [Keel overview](https://en.wikipedia.org/wiki/Keel)","Distinguish an internal keelson from the keel by its position and connection in the hull assembly.","Distinguish a ballast keel from an unballasted board through documented mass distribution and design function, rather than retractability alone.","Distinguish the installed keel from its design drawing, replacement casting and any separately replaceable protective shoe."],"structure":{"bundles":[{"id":"keel-identity-and-role","name":"Keel identity and role","description":"Establish which nautical component is being represented and which functions it actually serves.","layers":[{"id":"component-boundary","name":"Component boundary","description":"Locate the keel within the hull assembly and separate adjacent components.","findings":[{"id":"identified-keel-assembly","name":"Identified keel assembly","description":"Record the evidence identifying the keel and the limits of the represented assembly.","questions":[{"text":"Which drawing or inspection identifies this component as the vessel's keel?","id":"identified-keel-assembly-q01","kind":"definition"},{"text":"Does the assembly include its bulb, bolts, encapsulation or protective shoe, and which remain linked components?","id":"identified-keel-assembly-q02","kind":"boundary"}]}]},{"id":"design-function","name":"Design function","description":"Distinguish structural, hydrodynamic and ballast responsibilities.","findings":[{"id":"documented-keel-functions","name":"Documented keel functions","description":"Associate each claimed function with the specific keel design.","questions":[{"text":"Which structural, lateral-resistance or ballast functions does the designer assign to this keel?","id":"documented-keel-functions-q01","kind":"definition"},{"text":"What evidence distinguishes this keel from a centreboard, skeg or keelson in this vessel?","id":"documented-keel-functions-q02","kind":"boundary"}]}]}]},{"id":"geometry-and-ballast","name":"Geometry and ballast","description":"Describe the keel's shape, construction and mass distribution in vessel coordinates.","layers":[{"id":"shape-and-envelope","name":"Shape and envelope","description":"Capture nominal and observed geometry across applicable keel positions.","findings":[{"id":"measured-keel-envelope","name":"Measured keel envelope","description":"Record dimensions with their datums, configuration and measurement uncertainty.","questions":[{"text":"What are the keel's depth, longitudinal extent and section dimensions relative to the hull datum?","id":"measured-keel-envelope-q01","kind":"measurement"},{"text":"How does its underwater envelope change across permitted deployment or cant positions?","id":"measured-keel-envelope-q02","kind":"measurement"}]}]},{"id":"construction-and-mass","name":"Construction and mass","description":"Identify load-bearing materials and any ballast carried within or below the keel.","findings":[{"id":"verified-material-and-ballast","name":"Verified material and ballast","description":"Separate documented construction and mass properties from estimates.","questions":[{"text":"Which materials form the keel body, ballast and encapsulation, and which records establish them?","id":"verified-material-and-ballast-q01","kind":"provenance"},{"text":"What are the keel assembly's mass and centre of gravity, and do those values include fittings and ballast?","id":"verified-material-and-ballast-q02","kind":"measurement"}]}]}]},{"id":"attachment-and-movement","name":"Attachment and movement","description":"Represent the keel-to-hull connection and any controlled movement.","layers":[{"id":"hull-load-transfer","name":"Hull load transfer","description":"Locate the interfaces carrying keel forces into the vessel.","findings":[{"id":"keel-connection-evidence","name":"Keel connection evidence","description":"Identify the joint, supporting hull structure and documented connection requirements.","questions":[{"text":"How is this keel connected to the hull, and which bolts, welds, bonds or integral structures transfer its loads?","id":"keel-connection-evidence-q01","kind":"definition"},{"text":"Which drawings and installation records establish the connection's required configuration?","id":"keel-connection-evidence-q02","kind":"provenance"}]}]},{"id":"deployment-and-locking","name":"Deployment and locking","description":"Record movement limits, indicated position and restraint where the keel is movable.","findings":[{"id":"supported-keel-position","name":"Supported keel position","description":"Establish the actual position and the evidence that it is held as intended.","questions":[{"text":"What evidence establishes the keel's current position and lock engagement independently of a movement command?","id":"supported-keel-position-q01","kind":"measurement"},{"text":"Which documented prerequisites and limits apply before raising, lowering or canting this keel?","id":"supported-keel-position-q02","kind":"action"}]}]}]},{"id":"condition-and-intervention","name":"Condition and intervention","description":"Connect keel-specific observations and damage history to documented intervention decisions.","layers":[{"id":"damage-and-inspection","name":"Damage and inspection","description":"Locate deterioration and establish what the inspection could actually observe.","findings":[{"id":"keel-defect-assessment","name":"Keel defect assessment","description":"Record defects, inspection coverage and unresolved areas at the keel and its attachment.","questions":[{"text":"Where are cracks, corrosion, deformation, joint movement or material loss observed, and how were they measured?","id":"keel-defect-assessment-q01","kind":"measurement"},{"text":"What grounding or impact events are recorded, and which keel and hull-interface areas were inspected afterward?","id":"keel-defect-assessment-q02","kind":"provenance"},{"text":"Which attachment surfaces or internal regions remain inaccessible or unassessed?","id":"keel-defect-assessment-q03","kind":"boundary"}]}]},{"id":"repair-and-return-to-use","name":"Repair and return to use","description":"Trace keel interventions to their technical basis and acceptance evidence.","findings":[{"id":"supported-intervention-decision","name":"Supported intervention decision","description":"Record the scope and prerequisites of an intervention without inferring approval from its completion.","questions":[{"text":"What documented procedure governs supporting, detaching, repairing or replacing this particular keel?","id":"supported-intervention-decision-q01","kind":"action"},{"text":"Which inspections and acceptance records support return to use after the intervention?","id":"supported-intervention-decision-q02","kind":"provenance"},{"text":"Does the intervention change keel mass, geometry or attachment enough to require a new vessel-level assessment?","id":"supported-intervention-decision-q03","kind":"boundary"}]}]}]},{"id":"evidence-and-external-alignment","name":"Evidence and external alignment","description":"What the world already says about this thing, gathered so the model can be checked against it.","layers":[{"id":"reported-evidence","name":"Reported evidence","description":"Findings from the breadth pass, kept separate from the structural claims.","findings":[{"id":"evidence-confidence-notes","name":"Check these first","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these check these first hold for the sense of keel this model covers, and on what evidence?","id":"evidence-confidence-notes-q01","kind":"provenance"}]},{"id":"evidence-kinds","name":"Kinds and varieties","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these kinds and varieties hold for the sense of keel this model covers, and on what evidence?","id":"evidence-kinds-q01","kind":"provenance"}]},{"id":"evidence-real-world-use","name":"Real-world use","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these real-world use hold for the sense of keel this model covers, and on what evidence?","id":"evidence-real-world-use-q01","kind":"provenance"}]},{"id":"evidence-measurements","name":"Typical measurements","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these typical measurements hold for the sense of keel this model covers, and on what evidence?","id":"evidence-measurements-q01","kind":"provenance"}]},{"id":"evidence-failure-modes-and-hazards","name":"Failure modes and hazards","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of keel this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","kind":"provenance"}]},{"id":"evidence-neighbours","name":"Neighbouring kinds and how to tell them apart","description":"Recalled without web access and unsourced; every item is a lead to verify.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of keel this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Inspect and report a keel's condition, fastenings and damage on vessels it is authorized to survey.","Report draft and keel depth to navigators planning routes."],"mustNot":["Approve a vessel as seaworthy with signs of keel or keel bolt damage.","Navigate where depth is unknown relative to the keel's draft.","Alter or remove a keel or ballast without a stability assessment.","Hide grounding damage from owners, insurers or buyers."],"requiresHuman":["Returning a vessel to service after a grounding or keel repair."]},"ethics":{"considerations":["Keel failures capsize boats and drown crews.","Honest survey records protect buyers and crews."],"affectedParties":["Crews and passengers","Owners and buyers","Rescue services"]},"owners":{"steward":"The vessel's owner; flag state and classification records cover larger vessels.","roles":[],"masterSystems":["Ship registers and classification society records"]},"relations":[{"target":"Q15688633","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.keel-q1646730","Wikidata: Q1646730 (https://www.wikidata.org/wiki/Q1646730)"]},"properties":{"applicability":"not-applicable","items":["Keel role: structural; hydrodynamic; ballast-bearing; combined; unresolved","Keel configuration: documented structural or appendage type, including fixed or movable configuration","Host hull and attachment: vessel identity, hull revision and attachment drawing","Geometry: length, depth, chord and thickness in m; projected area in m²; reference axes stated","Mass and centre of gravity: kg and coordinates in m relative to a stated vessel datum","Material and construction: documented materials, grades, laminates, encapsulation and protective systems","Deployment and restraint: fixed; deployed; retracted; intermediate; locked; unlocked; position unknown","Inspection disposition: unassessed; accepted within stated limits; restricted; repair required; reassessment required"]},"recognition":{"applicability":"optional","items":["A long structural member running along the bottom centreline of a hull.","On sailing boats, a fin, bulb or long keel projecting below the hull."]},"capabilities":{"applicability":"required","items":["Match an installed keel to its hull-specific design and configuration.","Compare measured geometry and mass with documented design values.","Record and locate keel, attachment and protective-surface defects.","Identify missing evidence needed after grounding, impact or unexplained movement.","Check whether a proposed keel position or maintenance action meets documented prerequisites.","Trace repairs and replacements to their inspection and acceptance records."]},"hazards":{"applicability":"required","items":["Keel loss or detachment causing capsize.","Grounding damage to the keel and hull.","Corrosion of keel bolts out of sight."]},"interfaces":{"applicability":"required","items":["ISO 12215, Small craft, Hull construction and scantlings, issued by the International Organization for Standardization."]},"context":{"applicability":"required","items":[]}},"sources":[{"title":"Wikidata item Q1646730: keel","url":"https://www.wikidata.org/wiki/Q1646730","note":"identity and sense of the item"}],"openQuestions":["What entity does Wikidata Q1646730 actually identify, and does it support the provisional nautical interpretation?","Why is this entry classified as INF / INF.MED, and is that classification or the supplied name incorrect?","Does an existing Vercy world model already own the intended keel concept and require this registry entry to link to it?","Which keel variants and neighbouring appendages belong within this registry entry's authoritative boundary?","Which design-specific sources establish inspection criteria, permissible configurations and intervention requirements for each covered keel type?"],"resources":{"spec":"/models/things/publications/thing-q1646730/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1646730/spec.json"],"providers":["Codex"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T10:45:43Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"missing","sources":"filled"},"notes":{"interaction.properties":"Plane INF: no invented physical properties."},"score":0.938}}