{
    "title": "John McGinnis Synergy Aircraft articles & patents",
    "inventor_name": "John McGinnis",
    "publication_year": null,
    "device_name": "Synergy Aircraft",
    "goal": "Create a highly aerodynamic, fuel-efficient personal aircraft with low induced drag and stall-resistance.",
    "problem_addressed": "High fuel consumption, induced drag, and stall risk in conventional small-engine personal aircraft.",
    "concept_summary": "The Synergy Aircraft uses a closed-wing \"double-box tail\" configuration, laminar-flow wing surfaces, boundary-layer control, and six patented drag-reduction innovations (laminar flow, non-planar configuration, wake-immersed propulsion, open thermodynamic cycle, pressure thrust, optimum volumetric displacement waveform) to achieve dramatically lower fuel burn and improved stall characteristics.",
    "detailed_description": "The design features a vertical winglet connecting the tail and wingtip on each side, forming a double-box tail that reduces induced drag. A 200 hp (149 kW) DeltaHawk V-4 diesel engine (capable of running on biofuel) provides propulsion, while a 1/4-scale carbon-fiber model has been radio-controlled and flown to validate aerodynamic predictions. The aircraft is intended to seat five passengers, achieve ~40 mpg (~=10x the efficiency of comparable jets), cruise at 100-450 mph, and have a 500-mile range. Additional safety features include a ballistic parachute and push-button landing system.",
    "category": "Aerodynamics & Flight",
    "principles": [
        "Double-box tail (closed wing)",
        "Laminar flow",
        "Non-planar configuration",
        "Wake-immersed propulsion",
        "Open thermodynamic cycle",
        "Pressure thrust",
        "Optimum volumetric displacement waveform",
        "Boundary-layer control",
        "Induced drag reduction"
    ],
    "scientific_domains": [
        "Aeronautics",
        "Fluid dynamics",
        "Mechanical engineering",
        "Thermodynamics"
    ],
    "mechanisms_of_action": [
        "Reduces induced drag via double-box tail geometry",
        "Maintains laminar flow to lower skin-friction drag",
        "Controls boundary layer separation",
        "Uses wake-immersed propulsion to improve thrust efficiency",
        "Employs open thermodynamic cycle for higher fuel-to-power conversion",
        "Generates pressure thrust through optimized volumetric displacement"
    ],
    "materials": [
        "Carbon fiber",
        "Composite materials",
        "Metal alloy"
    ],
    "energy_sources": [
        "Biofuel",
        "Diesel fuel",
        "Electric battery (for RC scale model)"
    ],
    "inputs": [
        "Fuel (biofuel/diesel)",
        "Air",
        "Pilot control inputs"
    ],
    "outputs": [
        "Thrust",
        "Lift",
        "Aircraft flight"
    ],
    "claimed_performance": "~=40 mpg (~=10x conventional small-jet fuel economy), stall-resistant, maximum speed 100-450 mph, range 500 mi, cost ~10 % of comparable aircraft.",
    "experimental_evidence": "A 1/4-scale carbon-fiber model has been built, radio-controlled, and flown; test fly-by of the scale model reported the 40 mpg fuel-economy figure.",
    "replication_status": "Scale model tested and flown; full-scale prototype not yet built.",
    "keywords": [
        "double-box tail",
        "closed wing",
        "drag reduction",
        "fuel-efficient aircraft",
        "DeltaHawk engine",
        "laminar flow",
        "boundary-layer control"
    ],
    "related_technologies": [
        "Closed-wing aircraft",
        "Boundary-layer suction",
        "Ballistic parachute systems"
    ],
    "controversy_level": "low",
    "confidence_score": 0.9,
    "practicability_score": 0.6,
    "fringe_score": 0.1,
    "evidence_strength": 0.5,
    "risk_score": 0.2,
    "trl_estimate": 4,
    "source_urls": [
        "http://www.rexresearch.com/",
        "http://www.rexresearch1.com/",
        "https://www.youtube.com/watch?v=lMklmhXGcJQ",
        "https://www.youtube.com/watch?v=gfUlz8UegHM",
        "https://en.wikipedia.org/wiki/Synergy_Aircraft_Synergy",
        "https://www.designboom.com/technology/synergy-airplane-achieves-40mpg/",
        "https://www.kickstarter.com/projects/launchsynergy/synergy-aircraft-project",
        "http://rexresearch.com/McGinnisSynergyAircraft/US9545993B2.pdf",
        "http://rexresearch.com/McGinnisSynergyAircraft/US8657226B1.pdf"
    ],
    "organizations": [
        "Synergy Aircraft",
        "DeltaHawk",
        "Kickstarter",
        "CAFE Foundation",
        "NASA",
        "Experimental Aircraft Association"
    ],
    "applications": [
        "Personal transportation",
        "Recreational aviation",
        "Low-cost personal aircraft"
    ],
    "limitations": [
        "Funding constraints",
        "Engine availability delays",
        "Full-scale prototype not yet built",
        "Regulatory certification pending"
    ],
    "open_questions": [
        "Will the 40 mpg fuel economy scale to a full-size aircraft?",
        "Long-term structural durability of the double-box tail",
        "Effectiveness of the open thermodynamic cycle in operational conditions",
        "Scalability of wake-immersed propulsion concept"
    ],
    "red_flags": [
        "Fuel-economy claims based on scale-model data only; no independent full-scale verification"
    ],
    "evidence_quotes": [
        "A 1/4-scale carbon fiber model has already been tested, and with funding permitting the development team intends to build a full-scale prototype.",
        "Based on the scale model testing and calculations, the design is reported to achieve about forty miles to the gallon, ten times the fuel economy of conventional small jets.",
        "The Synergy Aircraft is the first aircraft that was designed to use the 200 hp (149 kW) DeltaHawk V-4 engine.",
        "The aircraft's closed wing design, termed a \"double box tail\", is intended to lower induced drag and be stall resistant, along with boundary layer control methods."
    ]
}