REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

PROPELLER AND SHIP MAIN EGINE SELECTION IN CORRELATION WITH OVERALL EFFICIENCY PROPULSION COEFFICIENT IMPROVEMENT

JOVO DAUTOVIĆ

Technical Test Center, Vojvode Stepe br. 445, Belgrade; e-mail jovodaut@gmail.com

VOJKAN MADIĆ

Technical Test Center, Vojvode Stepe br. 445, Belgrade; e-mail vmadic@gmail.com

sonja đurković

Military Technical Institute, Bulevar vojvode Bojovica br.2, Belgrade; e-mail sonja.djurkovic@yahoo.com

Abstract: This paper presents propeller selection method when the power of the ship engine is known and also influence of correct propeller selection on a significant improvement in overall efficiency propulsion coefficient. After that it shows the method of main engine selection in case of vessel modernization, i.e. replacement of one type with another type the drive when retain the old propellers. Main engine selection, in that case, is shown in the case of selection electric motor drive of the ship “KOZARA” in the process of its modernization during which diesel engine propulsion is replaced by diesel electric propulsion. In the end, power shaft measurement results on the shaft lines is shown which confirms main engine correct selection.

Keywords: propeller selection, electric motor selection, propeller curve, shaft power measurement, performance recording.