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The journal International Shipbuilding Progress (ISP) was founded in 1954. Each year four issues appear (in April, July, September and December). Publications submitted to ISP should describe scientific work of high international standards, advancing subjects related to the field of Marine Technology, such as:
- Concept development
- General design of ships and offshore objects
- Ship and offshore structural design
- Hydro-mechanics and -dynamics
- Maritime engineering and machinery systems
- Production processes of all types of ships and other objects intended for marine use
- Production technology and material science
- Shipping science, economics, and all directly related subjects
- Ship operations
- Offshore and ocean engineering in relation to the marine environment
- Marine safety
- Efficiency, lifecycle, and environment
- Ice-related aspects for ships and offshore objects.
The contents of the papers may be of a fundamental or of an applied scientific nature and must be of the highest novelty and rigor.
Authors: Molland, A.F.
Article Type: Research Article
Abstract: A modified lifting line theory is developed which supports the form of skeg-rudder experimental free-stream data obtained previously. 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 midspan 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. 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 can have a significant influence on the production of lift whilst changes in the skeg chord and rudder sweep have a marked effect on the stock position, balance area and hence torque. Show more
Citation: International Shipbuilding Progress, vol. 32, no. 370, pp. 138-150, 1985
Article Type: Research Article
Abstract: In recent years the surface source method of potential flow about arbitrary bodies has been developed extensively and has proved to be a useful tool. Refinements have been made to the basic method to improve computational speed and accuracy by using higher order representations. Although large increases in speed and accuracy have been achieved, so far no technique has been developed that will enable the body to be modified and changes in the flow characteristics to be calculated. This paper describes the use of B-splines in the surface source method where changes in the flow characteristics can be investigated by …modifying the input curve. Sample results are given to show the accuracy of the method. Show more
Citation: International Shipbuilding Progress, vol. 32, no. 370, pp. 151-155, 1985
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