The University of Southampton
University of Southampton Institutional Repository

A modified lifting line analysis for semi-balanced ship skeg-rudders

Molland, A.F. (1985) A modified lifting line analysis for semi-balanced ship skeg-rudders , Southampton, UK University of Southampton 81pp. (Ship Science Reports, 20).

Record type: Monograph (Project Report)

Abstract

A modified lifting line theory is developed which supports the form of skeg-rudder experimental free-stream data obtained previously, and forming the subject of separate reports.

It is demonstrated that satisfactory predictions of the form of the spanwise loadings for different skeg and rudder angles can be made using lifting line theory with the effect of the skeg being incorporated as local incidence reduction and the effects of the mid-span and tip trailing vortices being incorporated as twist corrections to the local incidence. The correct magnitude of the distributions is obtained by applying suitable empirical corrections. Chordwise centre of pressure is derived empirically.

It is concluded that whilst the theoretical approach is relatively simple and requires empirical correction, it gives very realistic predictions of skeg-rudder performance characteristics.

The theory is used to provide a limited extension to the experimental data. Predictions using the modified theory show that, for fixed aspect ratio and taper ratio, changes in the skeg depth have the largest influence on the production of lift whereas changes in the skeg chord and sweep mainly affect the stock position and the required balance area.

PDF 020.pdf - Version of Record
Download (1MB)

More information

Published date: 1985
Additional Information: ISSN 0140-3818

Identifiers

Local EPrints ID: 43359
URI: http://eprints.soton.ac.uk/id/eprint/43359
PURE UUID: 13f7b072-87c2-4bea-8bba-9bca3a22e41f

Catalogue record

Date deposited: 23 Jan 2007
Last modified: 17 Jul 2017 15:19

Export record

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×