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Reinforcing the transom of a Bertram Moppie 25 for an outboard conversion requires installing three structural knees to manage the increased leverage of an Armstrong bracket and twin outboards. The conversion shifts the engine weight approximately three feet aft, creating significant stress on the transom during acceleration and reverse.13:06 By anchoring the bottom of the transom to the hull stringers with these knees, the design aims to prevent the flexing that occurs when the bottom half of the transom is pushed forward or pulled back.13:52 The installation process involves templating the knees to ensure they are parallel and evenly spaced, then dry-fitting them to the hull.7:48 Removing existing, poorly constructed supports and excess resin buildup is necessary to ensure the new knees sit flush.4:00 Beyond structural integrity, the segmented design creates accessible storage compartments and potential mounting points for bilge pumps.14:53 Final fitting requires incremental trimming and beveling of the bottom edges to achieve a precise fit against the hull.12:04

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