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Waterjets in NavCad

We all know that waterjets are a very effective propulsor for high speed craft. But how do we model waterjet performance for speed-power calculations? What is the influence of hull form on their ability to drive a craft? How are waterjets different from propellers for... Read more

Pushboats and Propellers

Pushboats are the industrial workers of commerce, moving barges from place-to-place on rivers across the globe. And we appreciate their tireless transport of goods and cargo now more than ever. But what makes a pushboat different from a merchant ship or motor yacht?... Read more

Designer-guided hull form optimization

Vessel hull form drag is the principal system load that ultimately determines engine power, fuel consumption, and emissions, and we know that reducing this hydrodynamic “cost” is an important design objective. But is there a “best” hydrodynamic shape to achieve least... Read more

Towpull: System Analysis and Component Sizing

Tugs, trawlers, and other workboats require the ability to generate thrust for more than their own transit. They need supplemental thrust – known as “towpull” – to pull nets or push other boats. More than just “bollard pull”, towpull requires a properly functioning... Read more

Tunnel thrusters: function, sizing, and design

Tunnel thrusters are an invaluable asset for maneuvering and docking. But how do they really function? Did you know that inlet and discharge geometry can be as important as the thruster propeller itself for a successful installation? What about thruster noise? This... Read more