Characteristics of Hydrodynamic Derivatives in Maneuvering Equations for Super High-Speed

Paper Title Authors’ Names Organisation and Contacts

ABSTRACT Fig.1 Body plan of model ship

Written in bold.

INTRODUCTION

The model ship used in the experiments is a 1/4-scale model of a personal watercraft, and its body plan is shown in Fig.1. The model size

- Thin line computer prints of curves, etc. must be thickened - Color illustrations are OK, but make sure they are readabl efor the Black and White printed proceedings.

0.1 s.s.9.5

W.L. s.s.8.7

s.s.0 s.s.7.9 s.s.7.1 s.s.6.3 s.s.5.5 s.s.1.6 s.s.5.5 0 –0.1 0 0.1 C.L. 2. In the prediction of the maneuvering performance of the planing craft, all ship motions should be taken into account although conventional displacement ship can be predicted by considering only horizontal motions, which are sway and yaw motions. 3. Maneuvering motion can induce violent roll, heave and pitch motions when the natural frequencies of heave and pitch motions coincide with double of the roll natural frequency and the maneuvering motion has the same frequency as the roll natural frequency.

ACKNOWLEDGEMENTS

A part of the present study is supported by a Grand-in- Aid for Scientific Research of the Ministry of Education, Science Sports and Culture in Japan (10355037).

REFERENCES

Blount, D. B. and Codega, L. T.(1992), "Dynamic Stability of Planing Boats”, Marine SECTION HEDINGS

Dand, I. (1996), “Directional Instability and Safety of High Section headings are to be 10 pt Times or similar. Speed Marine Vehicles”, Proc. of the 5th International Conference on High Speed Marine Craft Safe Design and Safe Operation Subsection Headings

(by author in alphabetical order) Subsection headings are to be 10 pt Times or similar. Ibaragi, H., Kijima Transverse Insta Sub-subsection Headings Sub-subsection headings are to be 10pt Times Italic Katayama, T. and Ikeda, Y. (1995), “An Experimental Study or similar. on Transverse Stability Loss of planing Craft at High Speed in Calm Water”, Jour. of the Kansai Society of Naval Architects, Japan, No.224, pp 77-85

CONCLUSIONS Katayama, T. and Ikeda, Y. (1997), “ A Study on Coupled Pitch and Heave Porpoising Instability of Planing Craft rd Through an oblique towing tests for various attitudes, (3 report)”, Jour. of the Kansai Society of Naval fully captured PMM tests and partly captured PMM tests of Architects, Japan, No.228, pp 71-78 a planing craft model, maneuvering characteristics of a planing hull are experimentally investigated. Following conclusions are obtained. Kobayashi, H. and Shimura, Y. (1995), “A Study on the Maneuverability of High-Speed Boat”, Jour. of the 1. Hydrodynamic forces and moments acting on an Kansai Society of Naval Architects, Japan, No.223, pp obliquely towed planing hull significantly depend on 91-98 running attitude. Therefore maneuvering motion and the running attitude are affected each other for the planing craft.