A transom-mounted device enables vertical adjustment of an outboard motor. It facilitates modifications to the engine’s height relative to the boat’s hull. This adjustment is typically achieved through a manual or hydraulic mechanism. An example would be lowering the engine in rough water to keep the propeller submerged, or raising it in shallow water to avoid grounding.
Optimum engine height is critical for peak vessel performance. Raising the engine can reduce drag, potentially increasing speed and fuel efficiency. It also improves handling in certain conditions. Historically, optimizing engine height was a cumbersome process, requiring repositioning mounting bolts. The introduction of adjustable devices simplified this task, allowing on-the-fly adjustments to suit prevailing conditions.