Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2007. / The successful use of hydrofoil systems on catamarans, such as the Hysucat, led to the
development of a similar foil system for a high speed trimaran.
Firstly a mathematical model was developed to calculate the equilibrium planing conditions of a
planing trimaran. This was then used in the hydrodynamic design of a fully planing trimaran with
a design speed of 65 kn. The mathematical model was then modified to include the effects of
added hydrofoils. This model was then used to design a hydrofoil support system for the planing
trimaran.
Towing tank tests were then performed on a scale model of the boat, with and without the
supporting hydrofoil system. This was done to verify the theoretical design and to gather
resistance data, which could then be compared to other boats.
The results showed a notable improvement in efficiency of the boat with the addition of foils. The
conclusion was made that with the addition of a well-designed foil system, hull efficiencies
similar to that expected for the Hysucat, can be attained when the foil system is added to the
trimaran.
As this work was focused mainly on the high-speed performance of the boat, it is not certain how
the boat will perform through the speed-range. It is therefore recommended that further testing be
done, to determine the performance of the boat at lower speeds.
| Identifer | oai:union.ndltd.org:netd.ac.za/oai:union.ndltd.org:sun/oai:scholar.sun.ac.za:10019.1/2122 |
| Date | 12 1900 |
| Creators | Grobler, Barend |
| Contributors | Harms, T. M., Migeotte, G., University of Stellenbosch. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. |
| Publisher | Stellenbosch : University of Stellenbosch |
| Source Sets | South African National ETD Portal |
| Language | English |
| Detected Language | English |
| Type | Thesis |
| Format | 1437133 bytes, application/pdf |
| Rights | University of Stellenbosch |
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