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 to sailboat performance, accurately sizing the engine and fuel tanks are critical to meeting performance objectives both under sail and power. Join Alex Walker for this half-hour webinar to discover how HydroComp NavCad® can be used for quick, accurate performance prediction of auxiliary-powered sailboats to appropriately size the engine, fuel consumption, and even a folding propeller to meet your design goals.
Thursday 12 November, 2020
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 Vessel-Propulsor-Drive system. How does bollard pull differ from towpull? What design choices can ensure effective towpull? Join Don MacPherson for this half-hour webinar that will review how towpull is generated, its relation to bollard pull, and practices for propeller and driveline sizing.
Thursday 22 October, 2020
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 half-hour webinar will introduce the hydrodynamic function of a tunnel thruster, as well as practices for sizing and design. Spend a few minutes with Don MacPherson to review the thrust-making capabilities of a tunnel thruster, techniques for inlet and tunnel design, and tips for the sizing and design of thruster propellers.
Thursday 25 June, 2020
Did you know that the pitch of a propeller can be modified? This process – half art form, half science – provides us some flexibility for correcting performance problems or even re-using propellers with different engines and gears after repowering. Join Adam Kaplan for this half hour webinar, where we will discuss how to identify a required pitch change, the practical limitations for repitching a propeller blade, and the physical geometric changes that occur during a propeller repitching. This webinar is appropriate for propeller repair shops, propulsion equipment vendors, naval architects, and boat builders.
Thursday 18 June, 2020
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 drag? Probably. Can I use that shape? Probably not, since the other design objectives of hydrostatics and safety, structure and layout, even producibility and capital cost, typically have priority over considerations of speed and power. This half-hour webinar will review how “designer-guided hull form optimization” in NavCad helps point to the hull characteristics that offer drag reduction for a vessel design. Designers will then use this knowledge to optimize hull shapes that are compatible with their other design priorities. Spend a few minutes with Don MacPherson to review objectives, workflow, and a case study that used these techniques for substantial savings in fuel consumption and emissions.
Thursday 11 June, 2020