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Resources

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”). 

eCycle, Inc. – Electric Outboard

HydroComp’s consulting program for this project relied on our NavCad and PropCad commercial software tools, but also included proprietary CRP propeller sizing & analysis methods.

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

Analysis of Vessel Acceleration with NavCad

NavCad’s propulsion similation utilizes a true force equilibrium that can solve for accerlation rates and time to speed. This technical report reviews the steps of the analysis. The key is that the thrust applied to acceleration is not the free-running thrust, but is the maximum thrust that the propulsion system is able to produce at that speed.

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.

Bollard Pull

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

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.

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. 

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. 

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. 

Hull Speed

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

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.

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.

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.

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. 

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. 

The Three Modes of Cavitating Performance

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

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. 

Presentations

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

Contemporary UUV Propulsor Design

Unmanned underwater vehicle have their own set of propulsor design requirements related to their various missions, such as battery life (or the greatest distance traveled for the battery budget), maximum body diameter, and more.

Practical ‘Designer-Guided’ Hull Form Optimization

Through the application of a ‘designer-guided’ optimization strategy, naval architects can evaluate proposed hull form geometry both in parametric and distributed volume domains.

Understanding and Optimizing Vessel Propulsive Power and Fuel Use Using Duty Cycle Analysis Computations

This paper discusses a rational, simple, and effective systems engineering approach to identify power and fuel demands via computational propulsion analysis of the individual operating modes of a vessel’s duty cycle.

Employing HydroComp NavCad for Optimized Design

HydroComp NavCad, internationally recognized for resistance and propulsion prediction for naval architects, can also leverage analysis capabilities with features that support optimized hull form and propulsion system design.

Wake-adapted design and propeller analysis for naval architects

The hydrodynamic design and analysis of marine propellers occurs along a broad spectrum of detail nad complexity. Naval architects use system-level software for propeller analysis, but wake-adapted tools help realize benefits from custom propellers.

The need for (understanding) speed

To what level of detail should naval architects be evaluating propeller performance? Donald MacPherson, technical director of HydroComp Inc, puts the case for more active engagement.

A ‘tool chain’ for hydrodynamic analysis workflow

Hydrodynamic analysis is an evolutionary process that requires inter-related tools to strike the ideal balance between facility and precision, explains HydroComp’s Don McPherson.

Related Videos

Company video:

Learn more about HydroComp! HydroComp, Inc. was established in 1984 to provide powering analysis services to naval architects and shipbuilders. Best known for our award-winning NavCad® software, HydroComp is regarded as the premier source for performance prediction software, consulting, and knowledge..

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