Accession Number:

AD0849061

Title:

Study of Twin- and Triple-Screw Systems for Icebreakers

Descriptive Note:

Final rept.

Corporate Author:

MICHIGAN UNIV ANN ARBOR DEPT OF NAVAL ARCHITECTURE AND MARINE ENGINEERING

Report Date:

1966-09-01

Pagination or Media Count:

280.0

Abstract:

A parametric study of twin and triple-screw propulsion systems for large icebreakers is conducted with respect to technical properties and feasibility limits. The study is devoted to the following aspects in particular Bollard thrust, ahead, conventional propeller Bollard thrust, astern, conventional propeller Bollard thrust ahead and astern, special compromise propeller, designed for astern operation Propulsive efficiency at advance speed of 1 knot Propulsive efficiency, free running at 18 knots Radial and axial clearances between propellers and hull Steering and maneuverability Propeller excited hull and shaft vibrations Propeller strength Cavitation--further, the effect of the following parameters had to be considered Blade number, three versus four blades Hub size, solid and detachable blade screws Propeller diameter Area and power splitting ration, 111 versus 12 Powering SHP.

Subject Categories:

  • Marine Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE