PSModel a look inside

HOME

Introduction

Quick Start

Quick Series
Facts

PSModel
Program

Data Input

Data Output

Importing a
Data file into
MS Excel

Main Menu

Main Screen

Printing
Graphs
and Data

Screen Colors
and Fonts

Screen
Graphs

Shortcuts

Working
with Data

Testing:

Test Sheet

Examples

19' Ski Boat

34' Sailboat

41' Utility Boat

Technical

Blade Area
Ratio

Calculating
the Cavitation
Number

Horsepower
Losses

Hull Speed

Kt Breakdown

Propeller
Geometry

Propeller Law

Wake Factors

Glossary

References

Introduction:

PSModel is a tool which aids in the selection and evaluation of marine propellers for both small and large vessels.  It transforms each included Propeller Series from an arcane technical reference, normally used by a Naval Architect, into intuitive tools that can be easily used by boat owners and marine professionals alike.  With these tools, PSModel can approximate the thrust produced, torque absorbed, and horsepower required for a wide variety of propeller geometries and operating conditions.

Each Propeller Series included with PSModel is listed below.  The list is ranked according to preferred use with propellers that have flat-faced, circular-back blade sections.  This type of blade section, sometimes called a segmental section, is found on propellers used by the vast majority of recreational boats and small commercial vessels.  Symbols in parenthesis are a shorthand notation for the Series.

1) Navy 3 Blade Miniseries (NV3) – best Series to use for 3 bladed, flat-faced, circular-back propellers.

2) Navy 4 Blade Miniseries (NV4) – best Series to use for 4 bladed, flat-faced, circular-back propellers.

3) Segmental Sections (GBL) – best noncavitating Series to use if a 3 or 4 bladed, flat-faced, circular-back propeller falls outside the range of the two Navy Miniseries above.

4) Gawn Burrill Atmospheric Series (GRJ) – a polynomial representation of the subcavitating part of the 3 blade Gawn Burrill Series (GBA) below.  The range is slightly less than that of GBA.

5) Gawn Burrill Cavitating Series (GBR) – a polynomial representation of the cavitating part of the 3 blade Gawn Burrill Series (GBD) below.  The range is slightly less than that of GBD, but propeller curves are smoother and more consistent.

6) Gawn Burrill Atmospheric Series (GBA) – digitized 3 blade, subcavitating Series that can be used for boats that operate at planning speeds.  This Series works well with flat-faced, circular-back propellers.  This extensive Series was digitized from Gawn Burrill test curves.

7) Gawn Burrill Cavitating Series (GBD) – digitized 3 blade, cavitating Series that can be used for boats that operate at planning speeds.  This Series works well with flat-faced, circular-back propellers.  This extensive Series was digitized from Gawn Burrill test curves.

8) B Series (B) – extensive 2 to 7 blade noncavitating Series which can be used with flat-faced, circular back propellers even thought the actual Series geometry differs.

9) Newton Rader Series (NR) – Series used with Newton Rader style propeller geometry only.  Propeller blades can be fully engulfed by cavitation (supercavitating).

For the boat owner, PSModel includes instructions on how to perform boat powering tests with only a stopwatch and tachometer, and provides examples of how test data is used to look at -- and possibly improve -- powering performance.

For the marine professional, PSModel offers the ability to solve advanced propulsion problems with minimal effort and time.

To get started, go to Quick Start.

For in-depth information about each Propeller Series listed above, go to Quick Series Facts.

Enjoy PSModel!