New computer-based tank-testing techniques have added tremendously to the sophistication of hull design in recent years, but one problem remains; No one hull design seems to suit the incredible variety of conditions a seagoing craft is likely to encounter. For example, deep V hulls, built for stability at speed offshore, unfortunately also mean poor fuel economy, shallow water limitations and, at slow speeds,will rock and roll the breakfast out of even the most seasoned old salt. Modified V's provide more stability, less draft, and better economy, but they lack the seakeeping ability of the deep V offshore designs.
Euro Marine Ltd. has re-defined a enigmatic hull-form concept that was originally conceived in the early 1950s, that original concept, had the potential for incorporating advantages of the other popular hull shapes, but eliminated the disadvantages. New modern Computer Fluid Dynamics (CFD) calculation and design, has made it possible to have a complete departure from all existing conventual hull forms (Deep V, Modified V Etc.). Our “Hydro-Multi-Lift” design in a data base of "Van Oossanen & Associates B.V.”, of hundreds of tank tests of a range of boats, in the a range of 30 to 38 knots, out-performed all vessels with comparable Length-Beam ratios. Also an Evaluation and Stability Report was also made by "Van Oossanen & Associates B.V.”, and clearly shows that the criteria for ISO 12217, design category “A”, is fulfilled by a significant margin (Beaufort Force 10*) and associated wave heights. The “Hydro-Multi-Lift” hull also integrates new developments in underwater running gear, such as, “Hydro-Multi-Lift” “A” bracket strut and rudder design, setting new standards, for performance and safe seakeeping abilities in all weather and sea conditions.
*(Click HERE for information on “Beaufort 10” sea conditions)
In analysis (see diagram), the forefoot of the “Hydro-Multi-Lift“ hull has a sharp, V-shaped entry to cut through seas easily, crisply and with minimal splash.
Amidships, the hull flares into a enigmatic hull form, creating five planing surfaces: the flat box keel, two inner chines and two outer chines. This unique design not only creates highly efficient lift onto a plane, but excellent lateral stability as well. Finally, the aft section provides tremendous stability through its relatively flat, wide shape, while the concave form sends clean, non-turbulent water to the area of propulsion, creating a very efficient slipstream for the props. This also allows EML captains to cut back to one engine on long voyages because this aft hull shape eliminates the steering action that a single rotating prop creates when it "pushes" water against the deep-V typical of other designs.
Another important benefit to the “Hydro-Multi-Lift” hull design is its very shallow draft. The low displacement of newly introduced “Alustar” a high strength, light weight corrosion resistant marine aluminum, coupled with the elimination of the deep-V amidships, makes it possible to confidently maneuver the PI-65 in areas far too shallow for other ships, and to follow the bad guys,
where larger ships fear to go. So in a very real sense, it is the ideal hull design for our oceangoing
Patrol / Interdiction / Surveillance Craft.
