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Case Studies

Patrol Boat Waterjet Analysis

NavCad’s waterjet performance model exposes efficiency (from the published curves), which identified that the proposed waterjet was inefficient at the intended operating speeds.

Lift Foils – Advanced eFoil Propeller and Shroud Design

Lift Foils of Puerto Rico is considered the inventor of the “eFoil” propeller-driven hydrofoil board – an electric-powered futuristic personal watercraft (The Wall Street Journal, “Surfers Want to Transform Your Commute with Hydrofoils”).

Jaia Robotics – The Little Bot That Could

JaiaBots are micro-sized AUVs for aquatic data collection from Jaia Robotics LLC. HydroComp utilized our NavCad and PropElements software to assist with the development of a compact propulsion system and hull form improvements.

MST – JetBoots

JetBoots are a personal propulsion system for divers from Mazin Submersible Technology, Inc. MST contracted with HydroComp for the development of a new propulsor for their JetBoots version 4 to increase thrust and reduce motor demand.

White Papers

Bollard Pull

Technical report breaks down bollard pull into rating, thrust and towpull.

Blade Area Ratio Defined

Technical report defines blade area ratio as the parameter used to define the size of a propellor blade to its diameter.

Definition of Section Offsets in PropCad

This report expands on the coordinate specifications used to define propeller blade section offsets in PropCad. Procedures to convert data from other formats are presented.

Definition of Propeller Tunnels for PropExpert

Propeller tunnels can have a major impact on propulsion, speed, and power. This artcile helps define tunnel geometry and when tunnel corrections should be considered.

When Does Shallow Water Become a Problem?

This report is written to help determine when shallow water becomes a problem. During sea trial analyses, users of NavCad and PropExpert have encountered situations where the drag and power were much greater than expected.

Estimating Propeller Forces for Blade Strength Analysis

This report provides a simple model for the estimate of ppropeller forces suitable for use in structural analysis.

Import CAD File for PropCad Premium 2018

The latest release of PropCad 2018 Premium Edition includes a new utility to simplify the extraction of propeller features from full 3D CAD files. This new feature drastically reduces the time and effort to recreate an existing propeller.

Hull Speed

Technical report looks at the number of characteristics that affect the magnitude and location of the hull speed hump.

Propeller Inspection with PropCad 2018

PropCad has many valuable features for propeller inspection. As of 2018, all editions of PropCad include several inspection documents that summarize the design data and inspection locations for propeller technicians.

Predicting Resistance and Power for an Integrated Tug/Barge Using NavCad

The force available to overcome the vessel inertia is the possible thrust less the vessel’s resistance. Mass is the vessel weight with a multiplier for the added mass of entrained water that moves with the hull.

Singing Propellers

This report will try to introduce what – in our opinion – is the likely cause of singing, as well as to offer some guidance regarding ways to eliminate singing from a propeller.

Reconstruct Existing Designs with Scan Converter

The Scan Converter utility, which is now a part of PropCad Premium, is used to extract propeller parameters such as pitch, chord, skew, rake, and thickness using 3D data points collected from a physical propeller.

Tips for Predicting Speed with PropExpert

There are some strategies that you can use to reliably predict speed. This white paper includes a few suggestions to help you consistently get an accurate speed prediction with PropExpert.

The Three Modes of Cavitating Performance

Technical report examines three modes of cavitating performance: sub-, trans- and super-cavitating.

Presentations

Electric Motors for Propulsion

This presentation discusses the impact of electric motors on vessel performance and propeller selection.

NavCad Demonstrates Success at ASNE MACC

Showcase of NavCad’s equilibrium physics simulation model of planing, with prediction results comparable or better than any code tested.

Improving Effectiveness of CFD Self-propulsion Analysis with a Proxy Propeller and Engine Constraints

HydroComp takes part in a study to evaluate and improve maneuvering capabilities for a Canadian Coast Guard Special Navaids Vessel.

Propeller CAD File Import

This webinar demonstrates how design features can be extracted from an existing propeller CAD file and then used for new design variants of product development. A new utility in PropCad Premium helps propeller designers and builders to extract, understand, and visualize the design data from a 3D CAD file.

Reliable Speed Prediction: Propulsion Analysis and a Calculation Example

This paper will discuss propulsion relationships and our ability to predict how power is converted into thrust for a given application.

Publications

Pairing of Multi-Order Tools for Practical and Effective System Simulation

Donald MacPherson discusses how HydroComp software can be utilized in conjunction with CFD to employ multi-ordering modeling when CFD alone is not the optimum choice.

HydroComp NavCad and PropElements: Guardrails for CFD

Our Technical Director discusses how HydroComp software can be utilized as companion tools for CFD to help you achieve the best outcomes.

The “KISS Principle” & Managing, Measuring Ship Emissions

Don MacPherson, HydroComp’s long-tenured Technical Director, discusses the impacts of tightening emissions regulations, with insights on maximizing new vessel designs and refits.

Efficient Design-Stage Investigation of EEXI Compliance

Little needs to be said regarding the impact that EEXI (the Energy Efficient Existing Ship Index) will have on industry. While it is somewhat controversial in many circles, the regulations are in force. The immediate challenge is how you comply.

Underwater Radiated Noise – What’s Missing for Design

The time is now to incorporate URN assessment in design planning. It is a critical missing piece of the larger and notable objective of reducing the environmental damage caused by propeller-driven underwater radiated noise.