{
    "title": "Crossbow Plans & Patents",
    "inventor_name": null,
    "publication_year": null,
    "device_name": "Crossbow",
    "goal": null,
    "problem_addressed": null,
    "concept_summary": "The article compiles a large collection of DIY crossbow plans, instructional videos, and a list of recent patents covering a wide variety of crossbow mechanisms (e.g., repeating, magnetic-assist, spring-powered, portable, and safety-enhanced designs). It serves as a reference hub for hobbyists and engineers interested in building or improving crossbow devices.",
    "detailed_description": null,
    "category": "Mechanical Engineering",
    "principles": [],
    "scientific_domains": [
        "Mechanical Engineering"
    ],
    "mechanisms_of_action": [
        "Stored elastic energy in limbs or springs accelerates projectile",
        "Mechanical trigger and release systems",
        "Magnetic assistance in some designs"
    ],
    "materials": [
        "Wood",
        "Fiberglass",
        "Carbon fiber",
        "Steel",
        "Aluminum",
        "Plastic",
        "Composite laminates"
    ],
    "energy_sources": [
        "Human muscular energy (draw force)",
        "Spring potential energy",
        "Magnetic field (in magnetic-assist designs)"
    ],
    "inputs": [
        "User effort to draw the bow",
        "Arrows or bolts"
    ],
    "outputs": [
        "Propelled arrow/bolt"
    ],
    "claimed_performance": null,
    "experimental_evidence": null,
    "replication_status": null,
    "keywords": [
        "crossbow",
        "DIY",
        "patents",
        "repeating crossbow",
        "magnetic assist",
        "portable weapon",
        "archery"
    ],
    "related_technologies": [
        "Archery equipment",
        "Projectile weapons",
        "Mechanical triggers",
        "Spring mechanisms"
    ],
    "controversy_level": "low",
    "confidence_score": 0.85,
    "practicability_score": 0.9,
    "fringe_score": 0.1,
    "evidence_strength": 0.2,
    "risk_score": 0.2,
    "trl_estimate": 9,
    "source_urls": [
        "http://www.youtube.com/watch?v=SVahlTnt3lA",
        "http://www.youtube.com/watch?v=nWBuM3LNTcM?",
        "http://www.youtube.com/watch?v=Gw4MqgnwTS0",
        "http://www.youtube.com/watch?v=Pb4z5RmD5Vc?",
        "http://weaponcollector.blogspot.com",
        "http://www.instructables.com/id/Crossbow-Plents/",
        "http://www.vintageprojects.com/archery/crossbowfull-plans.pdf",
        "http://worldwide.espacenet.com/advancedSearch?locale=en_EP"
    ],
    "organizations": [],
    "applications": [
        "Hunting",
        "Sport shooting",
        "Recreational archery",
        "Survival gear"
    ],
    "limitations": [
        "Legal restrictions in many jurisdictions",
        "Limited range compared to firearms",
        "Requires user strength for draw"
    ],
    "open_questions": [],
    "red_flags": [],
    "evidence_quotes": [
        "\"Crossbow with Improved Rail and Arrow Slot\"",
        "\"Magnetic field type Zhuge crossbow\"",
        "\"Spring-powered repeating crossbow\"",
        "\"Portable strong crossbow\"",
        "\"Novel energy storage device of crossbow\""
    ]
}