{
    "title": "Vapor-Dyne Engine",
    "inventor_name": "William Bokon",
    "publication_year": 1977,
    "device_name": "Vapor-Dyne Engine",
    "goal": "Create a low-cost, lightweight, pollution-free engine with very high fuel efficiency for vehicles and generators.",
    "problem_addressed": "Heavy, high-rpm internal-combustion engines that waste >90 % of fuel energy, require complex transmissions, and emit pollutants.",
    "concept_summary": "A radial external-combustion engine that uses a closed-loop gas/steam drive fluid to push pistons via rollers in an eccentric cam groove. The engine runs at 750 rpm, has no crankshaft, and can be attached directly to a drive wheel, delivering power on every piston stroke.",
    "detailed_description": null,
    "category": "Mechanical Engineering",
    "principles": [
        "external combustion",
        "radial piston arrangement",
        "swashplate / cam-groove power transfer",
        "constant-pressure drive fluid",
        "direct-drive to wheel",
        "use of alcohol-water fuel mixture"
    ],
    "scientific_domains": [
        "Mechanical Engineering",
        "Thermodynamics",
        "Fluid Mechanics",
        "Combustion"
    ],
    "mechanisms_of_action": [
        "Fuel (alcohol-water) burned to generate steam/pressurized gas",
        "Pressurized gas applied alternately to opposite sides of pistons",
        "Reciprocating pistons move rollers that ride in an eccentric cam groove on a flywheel",
        "Continuous torque produced on every stroke, allowing direct wheel attachment"
    ],
    "materials": [
        "alcohol",
        "water",
        "perhalogenated benzene",
        "lubricating oil",
        "steel",
        "aluminum"
    ],
    "energy_sources": [
        "alcohol-water fuel mixture",
        "steam / pressurized gas"
    ],
    "inputs": [
        "fuel (70 % alcohol, 30 % water)",
        "air (oxidizer)",
        "lubricating oil (mixed in drive fluid)"
    ],
    "outputs": [
        "mechanical torque / vehicle propulsion",
        "heat",
        "exhaust steam"
    ],
    "claimed_performance": "Better than 50 mpg (conservative), up to 80 mpg claimed; engine weight 45 lb; 8-cylinder radial layout; 750 rpm; life >150 000 mi; 17 moving parts.",
    "experimental_evidence": "Laboratory dynometer tests reported >50 mpg on a large automobile; inventor's own readouts cited as basis for the claim.",
    "replication_status": "No independent replication reported; rights sold to an Indonesian firm but no production to date.",
    "keywords": [
        "Vapor-Dyne",
        "external combustion",
        "radial engine",
        "swashplate",
        "steam engine",
        "high-efficiency",
        "direct drive"
    ],
    "related_technologies": [
        "Swashplate mechanism",
        "Keller roto-oscillating vane",
        "radial piston engines",
        "external-combustion engines"
    ],
    "controversy_level": "medium",
    "confidence_score": 0.7,
    "practicability_score": 0.5,
    "fringe_score": 0.4,
    "evidence_strength": 0.5,
    "risk_score": 0.2,
    "trl_estimate": 4,
    "source_urls": [
        "https://rexresearch.com/vapordyne.html"
    ],
    "organizations": [
        "Indonesian manufacturer (unspecified)",
        "University of California, Riverside (student designer)"
    ],
    "applications": [
        "Automobile propulsion",
        "Truck propulsion",
        "Boat propulsion",
        "Portable generator",
        "Fluid pump"
    ],
    "limitations": [
        "No verified real-world fuel-economy data",
        "Requires alcohol-water fuel mixture",
        "Manufacturing complexity of radial swashplate system",
        "Lack of commercial production"
    ],
    "open_questions": [
        "What is the actual mpg achieved in road conditions?",
        "How does the engine perform over long-term operation?",
        "Can the design be scaled to higher-power applications?",
        "What are the emissions characteristics with various fuels?"
    ],
    "red_flags": [
        "Absence of peer-reviewed testing",
        "Claims based solely on inventor's laboratory readouts",
        "No independent replication or commercial deployment"
    ],
    "evidence_quotes": [
        "\"Laboratory tests indicate we can drive a large automobile at highway speeds and obtain better than 50 miles per gallon\"",
        "\"The engine will run trouble-free for better than 150,000 miles\"",
        "\"I'm being conservative with the estimates\" (regarding up to 80 mpg)",
        "\"The eight pistons are in a radial block, so at least six of them are delivering power at all times\"",
        "\"The engine can alternatively operate as a pump by applying motive power to the shaft\""
    ]
}