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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.

Bay Marine – Comprehensive Powering Analyses

HydroComp provides a variety of powering analysis services to Bay Marine for their work boats, fishing boats, passenger ferries, and research vessels – including a new vessel for the University of Delaware and a 130′ double-ended ferry.

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. 

Evaluating Skewed Propellers

This article provides an overview of skewed propeller geometries, as well as the effect of skew on propeller thrust and power performance. It does not address the hydroacoustic benefits of skew.

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. 

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. 

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.

Webinars

The Three Modes of Cavitating Performance

A look into the three modes of cavitating performance – sub-cavitating, trans-cavitating, or super-cavitating.

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 Video and Tutorials

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..

Rapid Design Space Optimization

HydroComp NavCad is internationally-recognized as the gold-standard for resistance and propulsion prediction for naval architects. With the recent introduction of the Premium Edition, NavCad is now able to provide integrated support for design optimization…

Features of NavCad Premium Edition

See the new features for NavCad Premium, HydroComp’s latest and most advance package containing a collection of major new capabilities! This webinar will demonstrate some of the new premium tools and much more…

NavCad and Barge Resistance

Sometimes the least sophisticated vehicle is the hardest to analyze. With respect to resistance, this is definitely the case with barges. In this webinar, we will review three different barge configurations for analysis in NavCad – individual box barges, river barge trains (with pushboat), and integrated tug-barge units (ITB/ATB)…

NavCad 2014 Jumpstart Presentation

We invite you to see NavCad 2014 first hand with this “NavCad 2014 Jumpstart Presentation”. While this 30 minute presentation is intended to discuss new features for existing users, you might find it to be a good introduction to NavCad and we welcome you to join us.

Importing legacy files Into PropCad

This video reviews how to import legacy PropCad 4 files (from PropCad 2011 and earlier) into the latest version of PropCad. This procedure is used in PropCad 2014 and newer…

Exporting a PropCad design to Solidworks

This short video demonstrates how to prepare a PropCad propeller design for export to Solidworks. We will export the geometry from PropCad and run the macro within the Solidworks software…

PropCad – Adding r/R sections and root fillets

This video reviews how to add new radial positions to a propeller project in PropCad. Sections can be added to intersect the blade and the hub geometries, and finally root fillets can be defined and visualized.

Recreating a Propeller Design from a Drawing

Propeller builders and marine engineers will find value in this review of recreating a design from a drawing. This PropCad session reviews manual entry of distributions (pitch, skew, rake, chords) and section shapes and culminates in a new 3D model and 2D drawing.

Propeller Thickness, Class Societies, and Compliance

(Note: there is a 1:30 minute audio delay at the beginning.)
In this webinar, HydroComp will review an important subject for propeller builders: compliance with classification society thickness rules. We will discuss selection of classification societies, rule applicability, materials, variations and similarities between society rules, and important “need-to-know” caveats that anyone using these calculations should master…

Scan Converter for Propeller Feature Extraction

HydroComp PropCad is often used to interpret existing propellers, patterns, and scan reports in order to recreate legacy designs. The Scan Converter utility – which is now a part of PropCad Premium Edition – is used to extract propeller features such as pitch, chord, skew, rake, thickness and section offsets using 3D data points collected from a physical propeller or pattern.

Design of Patterns with PropCad Premium

HydroComp PropCad features a new Premium Edition utility for creating propeller patterns and mold geometries. The new “Pattern Corrections” utility allows users to rapidly create casting patterns, mold geometries, and machining models by specifying the machine stock and shrinkage factors to be applied to the original PropCad design model.

Introduction to PropCad

PropCad 2014 is a powerful update to PropCad 2011 which introduces many new design tools, an updated interface, and powerful new features. Join HydroComp for this introduction to propeller design in PropCad 2014

Using Prior Trial with PropExpert

In this webinar, HydroComp will review a vessel which is requesting a new propeller. A client with a 14.5m motor yacht wants to increase top speed from 19.2 knots on trial to a desired 26 kts. We also encourage anyone interested in PropExpert to join us and see how PropExpert can increase their analytical capabilities.

PropExpert 2013 for Existing Users

This is a short introduction to the important new features of PropExpert 2013 for users of previous versions of the software.

Introduction to PropExpert

Learn about PropExpert, HydroComp’s propeller selection tool for the sizing and analysis of propellers for work boats and pleasure craft. It provides the tools needed for the proper selection of propulsion system components – engine, gear and propeller – and is the principal sizing tool of manufacturers and distributors.

About HydroComp PropElements 2017

Considering CFD for Propellers? Watch this webinar to learn how to use PropElements to conduct preliminary design space investigations, and establish benchmarks for CFD model validation.