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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...

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?...

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...
Article: Propeller Considerations for Inland-River Pushboats

Article: Propeller Considerations for Inland-River Pushboats

Inland river pushboats operate in a harsh environment. Transiting our rivers, bays, lakes, and inland waterways, these vessels push barges between hubs of commerce. Swift currents, trash and debris, heavy traffic, and narrow waterways are day-to-day realities for...

Performance Prediction for Sailboats Under Auxiliary Power

While the primary objective of most sailing vessel designs is performance under sail, auxiliary propulsion is also an important consideration. Often, the heaviest non-structural components on a sailing vessel are the engine and its fuel. Since weight reduction is key...

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...
Article: UV Tail Shape and Vehicle-Propulsor Performance

Article: UV Tail Shape and Vehicle-Propulsor Performance

Successful underwater vehicle (UV) performance is all about a properly functioning system. The components of a UV’s Vehicle-Propulsor-Drive system are not individual performers. They must be in harmony. Often overlooked during system design is the relationship between...