Ducktail retrofits to Cruise Ships

Nirray Surveys have been brought in to provide 3D Laser Scanning and Surveying for the fabrication and installation of ducktails to various Cruise Ship vessels. By capturing millions of data points to create a flawless digital map of the ship's existing hull, surveyors ensure that the new steel sections are fabricated to the exact measured specifications. This high-tech preparation drastically reduces the time a ship needs to spend in dry dock and guarantees a seamless fit when the heavy lifting begins.

The role of the duck tail provides the following benefits to passenger ships:

1. Enhanced Stability

Modern cruisers love top-deck attractions. From towering water slides and massive LED screens to multi-story glass observation pods, cruise lines are constantly adding top-heavy features to their vessels.

A ducktail significantly increases the ship's waterplane area at the stern. Much like widening the stance of your feet helps you keep your balance, widening the footprint of the ship's hull provides massive gains in stability, preventing the vessel from swaying or rolling uncomfortably in rough seas.

2. Fuel Efficiency and Hydrodynamics

It sounds counterintuitive that adding a massive block of steel to a ship makes it glide through the water easier, but it all comes down to hydrodynamics.

A ship's maximum speed and efficiency are heavily dictated by its waterline length. By extending the waterline with a ducktail, engineers alter the flow of water past the hull, reducing "wave-making resistance" (the drag caused by the ship pushing water out of its way). This smoother flow can improve fuel efficiency by anywhere from 5% to 10%—a massive financial and environmental saving for a vessel burning tons of fuel a day.

3. Buoyancy for Mega-Upgrades

When an older cruise ship goes into dry dock for a "stretch" or a massive refit, it often gains hundreds—or thousands—of tons in new weight. If you add heavy new balcony cabins and upper-deck restaurants to a 15-year-old ship, the stern will naturally sink deeper into the water, ruining the ship's optimal draft and creating drag.

The ducktail acts as a giant floatation device. It adds an immense amount of buoyancy to the aft section of the ship, compensating for the extra weight added to the upper decks and keeping the ship perfectly level in the water.

4. Meeting Strict Safety Regulations

Maritime safety regulations (specifically SOLAS, or Safety of Life at Sea) frequently update their requirements for ship stability and buoyancy. Adding a ducktail is often the most cost-effective way for a cruise line to bring an older, beloved vessel up to the newest, strictest international safety standards without having to retire the ship completely.