Sailing Umavideo
This Is the Last Line of Defense Before Our Boat Sinks | Step 475
February 22, 2026 · 39 min · 121K views
Crew member pumps water from boat with forceful arc
What this video covers
Dan and Kika of the 9,000-kilogram vessel UMA 3.0 install high-capacity emergency bilge pumps to manage potential flooding across six watertight compartments.1:57 They select a high-volume manual pump that operates on both strokes and a 12-volt electric pump rated for 78 liters per minute.3:13 Before installation, they conduct bench tests using 75-liter buckets to verify flow rates and power draw, confirming the electric pump empties the volume in approximately 25 seconds.5:23 To prevent back-flooding, they install check valves on the discharge lines, noting a 10% reduction in flow efficiency.20:06 They drill two-inch through-hull fittings as high as possible on the hull, reinforcing the mounting points with epoxied G10 backing plates.16:32 The manual pump system incorporates a wastewater diverter valve, allowing one pump to service both the main salon and the cockpit locker.38:03 The installation ensures the boat can maintain buoyancy by isolating flooded compartments or rapidly evacuating water during an emergency.
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