{
    "title": "Hydrofin - Wave-Riding Boat",
    "inventor_name": "Christopher Hook",
    "publication_year": 1947,
    "device_name": "Hydrofin",
    "goal": "Provide a smoother, faster ride in rough water by using adjustable hydrofoil angles that follow wave crests.",
    "problem_addressed": "Excessive motion and drag of boats in choppy seas.",
    "concept_summary": "A hull equipped with a series of \"jockey\" beams that adjust the angle of underwater hydrofoils in response to wave motion, allowing the boat to ride the crests and maintain lift.",
    "detailed_description": "The Hydrofin uses a set of forward-projecting feelers (jockey beams) that sense the rise and fall of waves. These beams mechanically change the pitch of attached hydrofoils, increasing lift when a wave crest arrives and reducing drag on troughs. The first commercial model is 30 ft long, carrying up to 14 passengers plus crew.",
    "category": "Mechanical Engineering",
    "principles": [
        "Hydrofoil lift",
        "Passive wave-following control"
    ],
    "scientific_domains": [
        "Fluid dynamics",
        "Naval architecture"
    ],
    "mechanisms_of_action": [
        "Variable-angle hydrofoils generate lift proportional to wave height",
        "Mechanical linkages translate wave-induced motion into foil pitch changes"
    ],
    "materials": [
        "Aluminum (hydrofoils)",
        "Steel (hull)",
        "Wood/metal (jockey beams)"
    ],
    "energy_sources": [],
    "inputs": [
        "Wave motion"
    ],
    "outputs": [
        "Increased lift",
        "Reduced pitch"
    ],
    "claimed_performance": "Smoother, faster ride in rough water; comparable to a car climbing a hill.",
    "experimental_evidence": "Popular Science article (Dec 1947) describing a prototype and its expected commercial launch.",
    "replication_status": "No independent replication reported.",
    "keywords": [
        "hydrofoil",
        "wave riding",
        "marine lift",
        "passive control"
    ],
    "related_technologies": [
        "Adjustable-pitch hydrofoils",
        "Wave-following vessels"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.7,
    "fringe_score": 0.1,
    "evidence_strength": 0.5,
    "risk_score": 0.1,
    "trl_estimate": 6,
    "source_urls": [
        "https://rexresearch.com/boat.html"
    ],
    "organizations": [],
    "applications": [
        "Coastal passenger transport",
        "Recreational craft"
    ],
    "limitations": [
        "Requires precise mechanical linkage",
        "Effectiveness depends on wave conditions"
    ],
    "open_questions": [
        "How does the system perform in very high seas?",
        "What maintenance is required for moving hydrofoils?"
    ],
    "red_flags": [],
    "evidence_quotes": [
        "\"The feelers jutting out from this novel boat follow the ups and downs of waves and troughs. In turn these 'jockey' skids change the angle of the hydrofoils to provide extra lift so that the Hydrofin boat rides the wave crests in rough water.\""
    ]
}