windmill
Enable an AI agent to recognise a windmill, assess its capacity and condition for wind-driven mechanical work, and determine which operations or interventions are appropriate.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an AI agent to recognise a windmill, assess its capacity and condition for wind-driven mechanical work, and determine which operations or interventions are appropriate.
A windmill is a fixed-site prime mover that extracts kinetic energy from ambient wind with a rotor of sails or vanes and delivers it as rotary mechanical work to millstones, pumps, saws or other process machinery, as distinct from a wind turbine whose designed product is electrical power.
It can be Identify the installation and reconstruct its intended mechanical power path from observations and records.; Inspect sails, supports, transmission and controls, recording defects and inaccessible areas.; Assess a proposed operating configuration against documented limits, weather observations and machinery readiness.; Request or coordinate authorised orientation, sail adjustment and load engagement using installation-specific procedures.; Determine the required stopping, restraint and isolation conditions before access or maintenance.; Plan repair or restoration while distinguishing retained fabric, replacements and unresolved historical details..
Distinguishing features
Determine whether wind acting on sails or blades is intended to produce shaft rotation, rather than merely indicate wind direction or measure wind speed.
Trace an intended mechanical power path from the rotor to a working load; distinguish missing historical machinery from a design that never performed work.
Identify wind as the intended energy source, distinguishing the installation from a watermill or an externally powered mill.
Establish whether the intended output is mechanical work, electricity or both before distinguishing a windmill from a wind turbine.
Check evidence of functional construction or former operation to distinguish a working or surviving windmill from a decorative replica.
Scope
+ Identity, original purpose, present function and completeness of the installation
+ Sails or blades, rotor geometry, orientation and wind exposure
+ Mechanical transmission and interfaces to grinding, pumping or other working machinery
+ Supporting structure, foundations and movable cap or body where present
+ Operating controls, stopping arrangements, condition and intervention constraints
- Electricity generation, grid connection and power-network behaviour
- Detailed models of pumps, millstones and other driven machines
- Regional wind climate and weather forecasting
- Farm, drainage-system or milling-business operations
- Site-wide land ownership, visitor management and heritage administration
Characteristics
- Functional identity
- grinding; water pumping; other mechanical work; hybrid; decorative or replica candidate; unresolved Connects identification to intended work and exposes uncertain registry boundaries.
- Construction configuration
- documented local type plus rotor-axis orientation, support form and movable assembly Determines which parts turn, carry loads and require inspection without forcing every tradition into one typology.
- Rotor swept dimensions
- m; diameter or explicitly described swept-envelope dimensions Establishes scale, clearance needs and the geometry relevant to wind loading.
- Wind-catching configuration
- observed sail, cloth, shutter or blade configuration; unknown where inaccessible The installed and deployed configuration affects wind capture and the ability to reduce it.
- Orientation mechanism
- fixed; manually oriented; automatically oriented; other documented arrangement; unknown Determines how alignment is established and whether unattended movement is possible.
- Driven equipment
- linked machinery with coupling location and engagement state Shows where mechanical energy goes and what must be coordinated before operation.
- Transmission continuity
- connected; intentionally disengaged; incomplete; seized; unverified Distinguishes rotor movement from the ability to deliver useful work.
- Rotor speed
- rpm, with observation time, wind conditions and load state Supports comparison with installation-specific operating limits and investigation of abnormal motion.
- Stopping and restraint readiness
- mechanisms present, observed condition and verification status recorded separately A fitted brake or restraint does not by itself establish that motion can be controlled.
- Structural serviceability
- assessed serviceable; restricted; assessed unserviceable; unassessed, with scope and date Links permitted use to evidence about the rotor supports, frame and foundation.
- Operating envelope
- installation-specific documented limits for wind, speed, load and configuration Provides an evidence basis for deciding whether a proposed operating state is acceptable.
Also called
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 29 questions.
Identity and working purpose Establish what installation is being represented and what work it was built or adapted to perform.
Windmill identity cannot be inferred from a tower and sails alone, especially for ruins, replicas and converted installations.
Functional identification
Test whether the installation belongs to this model and identify its intended output.
Wind-to-work identity
Record evidence that the wind-catching assembly was intended to drive mechanical work.
- What work was the wind-driven shaft intended to perform, and through which machinery? definition
- What evidence distinguishes this installation from an electricity-only turbine, wind indicator or decorative replica? boundary
Configuration history
Separate original design, later adaptations and the surviving installation.
Original and present configuration
Record changes that affect recognition, completeness and operating assumptions.
- Which records or physical traces establish the original rotor, transmission and working machinery? provenance
- Which assemblies are original, replaced, missing or converted to another power source? definition
Wind capture and orientation Describe how this windmill intercepts wind and establishes its working orientation.
Rotor form, sail setting and orientation determine the installation's response to wind and the actions available to control it.
Rotor and sail configuration
Record the wind-catching assembly as installed and configured.
Effective wind-catching assembly
Capture rotor geometry, component completeness and adjustable wind-catching surfaces.
- What are the rotor-axis orientation, sail or blade count and swept dimensions? measurement
- Which surfaces can be adjusted or removed, and what is their current setting and condition? definition
Alignment and exposure
Describe orientation mechanisms and immediate constraints on wind access and rotor clearance.
Orientation capability
Identify whether and how the rotor, cap or body changes orientation.
- Does this design require directional alignment, and which assembly and mechanism provide it? definition
- What nearby obstructions or movement limits affect wind exposure, orientation or sail clearance? boundary
Mechanical power and load Trace motion from the wind-catching assembly to the machinery performing useful work.
A rotating rotor does not establish that the windmill can transmit power or safely carry its intended load.
Transmission path
Identify shafts, bearings, gears and couplings that transmit or interrupt motion.
Power-path continuity
Record the actual connected path and its observable mechanical condition.
- Through which shafts, gears and couplings does rotor motion reach each load, and where can that path be interrupted? definition
- What inspection evidence establishes alignment, bearing condition, gear engagement and freedom from seizure? provenance
Working-load interface
Represent the connection to driven machinery without absorbing its detailed model.
Load readiness and demand
Record load compatibility, engagement state and constraints passed back from the driven machine.
- Which driven machines are connected, and what speed, direction and load requirements do their records specify? boundary
- What must be verified at each driven machine before engaging or disengaging its load? action
Support and physical integrity Assess the structures and connections that support the rotor and resist operating forces.
Wind capture and transmission depend on the integrity of stationary supports and, where present, large movable structural assemblies.
Load-bearing structure
Identify the support path from rotor and machinery to the ground.
Structural load path
Record supporting members, joints and foundation conditions relevant to continued use.
- Which members, joints and foundations carry the rotor, transmission and wind-induced forces? definition
- Where have decay, corrosion, cracking, looseness or settlement been observed, and how were they assessed? provenance
Moving-assembly integrity
Assess attachment, support and clearance of the rotor and any turning cap or body.
Retention and clearance
Record evidence about secure attachment and unobstructed intended movement.
- What is known about the condition and retention of sail or blade attachments, the rotor shaft and movable structural supports? provenance
- What clearances, play or deformation have been measured, and against which installation-specific criteria? measurement
Operation, stopping and intervention Connect operating evidence to decisions about running, stopping, securing and maintaining the windmill.
Wind availability, load changes and the effectiveness of controls determine whether movement can be managed and access permitted.
Operating readiness
Evaluate a proposed use against current conditions and documented constraints.
Permitted operating state
Record the evidence supporting operation, restrictions or a decision to leave readiness unresolved.
- What documented wind, rotor-speed, load and sail-setting limits apply to the present configuration? provenance
- Do current observations, inspection status and operator authority support the proposed operation? action
Stopping and secured access
Distinguish bringing motion to a stop from maintaining a verified state suitable for intervention.
Control and isolation evidence
Record applicable controls, restraints and isolation procedures, including other connected energy sources.
- Which mechanisms reduce wind capture, stop rotation or restrain movement, and what evidence establishes their present effectiveness? provenance
- What installation-specific procedure and verification are required before entering the rotor sweep or accessing the transmission? action
- Which auxiliary drives, connected loads or stored mechanical energy could cause movement after the wind rotor stops? boundary
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Post mill (whole body yaws on a central post)
- Smock mill (tapered timber tower; only the cap yaws)
- Tower mill (masonry or brick tower; rotating cap)
- Hollow-post / wip mill (small drainage mill; only the upper body turns)
- Paltrok mill (Dutch platform sawmill that yaws as a whole)
- American multi-blade farm mill (steel windpump)
- Vertical-axis Persian / panemone mill (Sistan type, walls channel the wind)
- Mediterranean canvas-sail tower mill (small stone tower, triangular cloth sails)
- Which of these kinds and varieties hold for the sense of windmill this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Wikidata - Q38790 - Item 'windmill'; related items include Q1790578 (windpump) and Q49833 (wind turbine).
- Library of Congress Subject Headings - Windmills - Bibliographic and catalogue heading; subdivisions by place and function (e.g. drainage, flour).
- Getty Art & Architecture Thesaurus - aat:300006273 - Concept 'windmills' under mills (buildings); confirm on vocab.getty.edu before treating the numeric id as normative.
- Dutch mill registers (De Hollandsche Molen / Rijksdienst voor het Cultureel Erfgoed) - national mill number / rijksmonument number on a named mill - Instance identifiers for surviving Netherlands mills, not a type code for 'windmill' as a class.
- Which of these identifiers and schemes hold for the sense of windmill this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- IEC 61400 series (International Electrotechnical Commission) - design, safety and testing of wind energy generation systems; governs electricity-producing plants often colloquially called windmills, not traditional mechanical mills.
- EN 1991-1-4 Eurocode 1: Actions on structures - Wind actions (CEN) - characteristic wind loads on towers, caps and sails when a mill is treated as a structure.
- Planning (Listed Buildings and Conservation Areas) Act 1990 (United Kingdom) - listing, consent and fabric control for historic mills.
- Erfgoedwet 2016 (Netherlands) - rijksmonument status and works consent for protected molens.
- National occupational safety law for rotating machinery and work at height (e.g. UK Health and Safety at Work etc. Act 1974 and PUWER; EU Machinery Directive 2006/42/EC where new or substantially modified machinery is placed on the market).
- Which of these standards and regulation hold for the sense of windmill this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Grain milling: surviving working corn mills in the Netherlands, eastern England and elsewhere still dress stones and produce flour for sale or demonstration.
- Polder and marsh drainage: Dutch wip and tower drainage mills (and their steam/electric successors) lift water between ditches and boezem; a few remain in the hydraulic system, many as heritage plant.
- Livestock and farm water: galvanised multi-blade farm mills on the North American plains, Australia and southern Africa drive borehole pumps.
- Industrial process: historically sawing timber (Zaan paltrok and related types), oil-seed pressing, paper, and Caribbean cane crushing.
- Heritage operation and tourism: staffed or volunteer mills at sites such as Kinderdijk and Zaanse Schans (Netherlands) and open-air mill museums in the UK and northern Europe.
- Landscape marker and toponym: listed buildings, village silhouettes, and place-names even where the machinery is long removed.
- Which of these real-world use hold for the sense of windmill this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Rotor / sail span (European post, smock and tower mills) - 10-28 - m
- Rotor diameter (American multi-blade farm mill) - 1.8-5 - m
- Tower or body height to cap - 8-30 - m
- Delivered mechanical power (large traditional mill in a working breeze) - 5-40 - kW
- Cut-in wind speed for useful work - 4-6 - m/s
- Number of sails or blades - 4 (European common); 8-18 (US farm mill) - count
- Which of these typical measurements hold for the sense of windmill this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Runaway mill: brake or reefing failure in a gale, overspeed, then sail, stock or windshaft fracture and possible cap loss.
- Storm wrecking of sails and staging when the mill is left facing or tailed incorrectly.
- Fire from brake friction, hot millstones, or lightning, often destroying a timber smock or post mill completely.
- Tower settlement, rot of the post or cant-posts, and collapse of stage or fan-tail.
- Occupational injury: entanglement in stones and gearing, falls from the stage, and being struck by a sail.
- Hydraulic consequence: a stopped drainage mill (or a failed successor pump) can leave a polder without lift during high water.
- Ice throw and blade failure are characteristic of large electricity turbines; they are not the dominant historic mill hazards.
- Which of these failure modes and hazards hold for the sense of windmill this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Netherlands: molen is the ordinary word; practice distinguishes grondzeiler (sails reach the ground) from stellingmolen (gallery), plus wipmolen and paltrok; volunteer and professional miller training is institutionalised.
- England and Wales: post mills concentrated in the east; smock and tower mills elsewhere; the automatic fantail is a characteristic winding device; 'windmill' in planning and listing is the historic mechanical mill.
- Mediterranean (Greece, Iberia, Balearics, Maghreb): small masonry towers with triangular canvas sails, often for grain or water, not the large north-European smock.
- Sistan (eastern Iran / southwestern Afghanistan): surviving and archaeological vertical-axis mills with masonry wind-catching walls, a separate lineage from the European horizontal-axis mill.
- North America, Australia, southern Africa: 'windmill' in rural speech usually means the steel multi-blade farm pump, not a masonry corn mill.
- Colloquial global English, especially around modern energy plant: 'windmill' is widely used for a three-bladed electricity turbine; millwright and IEC usage keep that plant as a wind turbine.
- Which of these regional variation hold for the sense of windmill this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Wind turbine - Designed output is electrical power via a generator (typically three aerofoil blades, powered yaw, hub heights tens of metres); a windmill's designed output is mechanical work at stones, a pump or a saw. IEC 61400 applies to the former.
- Watermill - Prime mover is a waterwheel or turbine on a controlled watercourse (millrace, weir, millpond), not a wind rotor; many sites historically combined both.
- Windpump (when treated as a separate class) - Purpose-built water-lifting plant, usually a steel multi-blade rotor and crank pump; a drainage or farm mill is a windmill used as a pump, but a specialised American farm mill is often catalogued as a windpump (Wikidata Q1790578) rather than as a corn mill.
- Tide mill - Driven by impounded tidal flow through a sluiced pond, not by wind; the building may look mill-like and share millstones.
- Wind engine / industrial wind motor - Nineteenth- and early-twentieth-century factory or farm motors (often annular or annular-sailed) sold as engines rather than as a milling building; test is whether the plant is a mill house with process machinery or a packaged wind motor driving a shaft.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of windmill this model covers, and on what evidence? provenance
Sources
- The English Windmill - Rex Wailes (Routledge & Kegan Paul, 1954; later reprints) - English structural types (post, smock, tower), fantail winding, millwright practice, and working measurements of traditional mills.
- The Dutch Windmill - Frederick Stokhuyzen (Merlin Press / later English editions of De Hollandsche Molen material) - Dutch type names (grondzeiler, stellingmolen, wipmolen, paltrok), drainage versus industrial use, and the Netherlands as the reference tradition.
- Windmill - Wikipedia (Wikimedia Foundation) - Overview of structural types, Persian vertical-axis mills, American farm windmills, and the modern distinction from wind turbines.
- windmill (Q38790) - Wikidata - Canonical identifier and alignment to Getty AAT and other authority files.
What the second pass must settle
- Does the registry intend windmill to include electricity-only wind turbines and hybrid installations, or should those link to neighbouring models?
- Which construction traditions and rotor configurations must be represented, and which distinctions affect agent decisions enough to require explicit categories?
- How should ruins, disconnected surviving structures, working replicas and decorative reproductions be classified within or outside this entry?
- Which authoritative sources establish configuration-specific operating limits, inspection criteria and stopping procedures without assuming one windmill design applies to all?
- Where should the ownership boundary fall between an integral working mechanism and a separately modelled pump, grinding assembly or other driven machine?