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TransNav, Faculty of Navigation
Gdynia Maritime University
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Drag and Torque on Locked Screw Propeller
1 Wrocław University of Science and Technology, Wrocław, Poland
2 Ship Design and Research Centre CTO S.A, Gdańsk, Poland
ABSTRACT: Few data on drag and torque on locked propeller towed in water are available in literature. Those data refer to propellers of specific geometry (number of blades, blade area, pitch and skew of blades). The estimation of drag and torque of an arbitrary propeller considered in analysis of ship resistance or propulsion is laborious. The authors collected and reviewed test data available in the literature. Based on collected data there were developed the empirical formulae for estimation of hydrodynamic drag and torque acting on locked screw propeller. Supplementary CFD computations were carried out in order to prove the applicability of the formulae to modern moderately skewed screw propellers.
REFERENCES
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H.F. Nordström: Screw propeller characteristics, Publ. No.9, SSPA, 1948
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R.F. Roddy, D.E. Hess, W. Faller: Neural network predictions of the 4-quadrant Wageningen propeller series, Naval Surface Warfare Center Carderock Division, Hydromechanics Department Report NSWCCD-50-TR-2006/004, April 2006
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Citation note:
Tabaczek T., Bugalski T.: Drag and Torque on Locked Screw Propeller. TransNav, the International Journal on Marine Navigation and Safety of Sea Transportation, Vol. 8, No. 3, doi:10.12716/1001.08.03.16, pp. 441-447, 2014

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