Page 31 - WestlawnMasthead19_Sept11.pub

This is a SEO version of WestlawnMasthead19_Sept11.pub. Click here to view full version

« Previous Page Table of Contents Next Page »
For a complete listing of up coming RINA
events, go to
http://www.rina.org.uk/events_programme
2011 Events Program
RINA organizes a programme of international conferences,
workshops and training courses, covering a broad range of
experience and opinion on research, development and op-
eration on all aspects of naval architecture and maritime
technology. For more information about any event, click on
a title.
The International Conference on Marine
Design
14-15 September 2011, Coventry, UK
CALL FOR PAPERS
International Conference on Computer Appli-
cations in Shipbuilding
20-22 September 2011, Trieste, Italy
REGISTER NOW
Basic Dry Dock Australia
11-14 October 2011, Melbourne
REGISTER NOW
Fundamentals of Contract & Change
Management
12-14 October 2011, London, UK
REGISTER NOW
Basic Dry Dock Singapore
17-20 October 2011, Singapore
REGISTER NOW
Marine Heavy Lift & Transport 3
26-27 October 2011, London, UK
CALL FOR PAPERS
Human Factors in Ship Design and Operatio
16-17 November 2011, London, UK
REGISTER NOW
ABYC SPRING & SUMMER WEBINAR SCHEDULE
—Continued
Dave Gerr, "Propeller Selection and Sizing" Continued from previous page
Notes:
If you need detailed practical information about selecting and sizing propellers and understanding their operation, atten
this seminar. We begin with a detailed review of basic prop-sizing equations (propeller geometry, diameter, number of blades,
hand, pitch, blade area and DAR); understanding and calculating slip; geometry refinements (skew, rake, blade section shape);
geometry tweaks (cup, progress pitch, pitch relief); and propeller function and induced drag. Next, we explain how to calculate
and specify a propeller for a single-screw displacement boat. This will include estimating boat speed; speed/length ratio and
Froude number; maximum hull speed; determining blade area and diameter; tip clearance; speed of advance (Va); wake factor;
blade area and blade loading; apparent slip; optimum pitch ratios; and propeller efficiency We also define important variables
such as reduction gear versus power versus diameter, and the diameter/power/rpm calculation; determine the reduction gear; d
termine pitch; and convert diameter to pitch and vice versa. After describing the final propeller spec, we look at two common
problems: working with an existing gear ratio, and insufficient reduction ratio. Finally, we review the propeller selection for a
twin-screw planing boat; this will include estimating speed, planing-hull wake factor, and cup.