Evaluation of side thruster performance

Article type: Research Article

Authors: Norrby, R.Å.

Affiliations: AB Karlstads Mekaniska Werkstad, Kristinehamn, Sweden

Abstract: Data on thrust, size and prime mover power for side thrusters are difficult to evaluate directly for different makes. The effectiveness ratio α according to equation (4) or (5) and shown in Figures 3 and 4 is recommended for evaluating side thruster performance. Tests with side thrusters on ships constitute a valuable basis for estimating obtainable thrust. The tests are difficult to carry through with sufficient accuracy. Further testing on board should be done with different side thruster makes. Values from full scale tests with KaMeWa controllable pitch side thrusters show acceptable conformity with corresponding pamphlet values. Table 1. The effectiveness ratio a has been calculated, based on pamphlet data from eight makers of controllable pitch side thrusters with Kaplan-shaped blades. The result is shown in Figure 3. For a number of the side thrusters investigated, too favourable a performance has been stated in the pamphlets.

DOI: 10.3233/ISP-1974-2124002

Journal: International Shipbuilding Progress, vol. 21, no. 240, pp. 252-256, 1974