{"article":{"id":"ball-flight-aerodynamics-and-seam-weld-integrity","categoryId":"equipment-physics-gear","categoryName":"Equipment Physics & Laboratory Testing","index":13,"question":"How does injection molding vs rotational molding affect ball flight true-ness?","answer":"Rotational molded balls have seamless, uniform wall thickness that flies true in wind, while two-piece injection welded balls can develop seam imbalances.","answerDetail":"Dura Fast 40 outdoor balls are manufactured via rotational casting: liquid polyethylene is poured into a spinning heated spherical mold, creating a single seamless sphere with consistent wall thickness. Franklin X-40 and other balls use two injection-molded hemispheres ultrasonic-welded together. Two-piece balls are more crack-resistant, while rotational seamless balls fly with unmatched precision favored by pro tour circuits.","intentTags":["equipment-physics-gear","ball","knowledge","standards"],"searchKeywords":["how does injection molding vs rotational molding affect ball flight true-ness?","ball flight aerodynamics and seam weld integrity","equipment physics gear"],"facilityTags":["testing-lab","regulation-court"],"serviceTags":["equipment-standards","player-ratings"],"environmentTags":["indoor","outdoor"],"structured":{"categoryId":"equipment-physics-gear","topicIndex":13,"verifiedYear":2026},"lastVerified":"2026-09-20","canonicalUrl":"https://dink-digest.com/knowledge/ball-flight-aerodynamics-and-seam-weld-integrity"},"discovery":{"canonicalUrl":"https://dink-digest.com/knowledge/ball-flight-aerodynamics-and-seam-weld-integrity","hubUrl":"https://dink-digest.com/knowledge","categoryArticlesUrl":"https://dink-digest.com/api/knowledge?category=equipment-physics-gear"}}