23ft Boat Flotation Bracket

Existing vessel and hull geometry Manufacturer / model / year John Allmand / 23′ Ticonderoga / 1967 Hull length Approximately 23′4″ (280″) Original propulsion Twin Volvo Penta B18 four-cylinder, twin-carb engines; twin Volvo Penta 200 sterndrives Flybridge Removed Hull-only dry weight assumption 2,750 lb, excluding propulsion Transom outside width at black paint line 78″ Black paint line height at centerline 17″ above keel Original waterline assumption 16″ above keel at transom; gunwales parallel to water Bottom transverse deadrise Approximately 16° continuous V Outer bottom corner above centerline keel Approximately 11⅛″ Outer bottom corner to gunwale Approximately 32″ Existing transom thickness Approximately 2″ Existing centerline stiffener width Approximately 4″ Aft cockpit wall position Approximately 10″ forward of original transom The 78″ measurement is at the paint line, not necessarily at swim-deck elevation. Existing twin sterndrive openings require engineered closure and integration with the new structure. 3. Flotation bracket geometry Setback 30″ aft of original transom Flotation tub outside width 46″ constant across full length Tub sidewalls Vertical, parallel Tub bottom 16° transverse V, no steps or secondary bevels Centerline bottom at transom 4.5″ above keel datum Centerline bottom at engine mounting face 6″ above keel datum Bottom longitudinal rise 1.5″ over 30″ Swim deck height Approximately 22–23″ above keel; flat and level Engine mounting lip Approximately 3″ above swim deck Swim platform lateral extension Approximately 2″ beyond actual hull sides at platform elevation; final width to be measured At a nominal 22.5″ deck elevation, centerline tub depth is approximately 18″ at the transom and 16.5″ aft. At the 23″ half-width edge, the V-bottom rises approximately 6.6″, yielding sidewall heights approximately 11.4″ and 9.9″, respectively. These are geometric estimates requiring confirmation against the hull.

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