STUDI EKSPERIMENTAL PENGGUNAAN BOSS CAP FINS UNTUK MENINGKATKAN EFISIENSI PADA PROPELLER

Abstract

The phenomena of cavitation which occurs when the propeller work can cause adverse
effects. One of them is the ship would miss the thrust so that the speed can not be
achieved as expected. Various experiments and researches have been done in an effort to
obtain maximum results by reducing or even eliminating cavitation occurring.
One of these efforts is to reduce or eliminate cavitation occurring on the hub vortex. This
is done by modifying the propeller without changing the original design self. The
propeller boss cap is modified by adding fins / fin, and then examines the differences
between the cavitation that occur with a standard cap boss the modified. It is then
calculated how big the impact on the efficiency of the propeller. In this study, propeller
models of type B series 4:45 (model no. 3468) is used. The test conducted in the
cavitation tunnel Laboratory for Hydrodynamics, BPP Technology in Surabaya.
From the results of efficiency measurements and observations conducted cavitation it was
found that modifications made to be able to eliminate the hub vortex cavitation thereby
increasing the efficiency up to 8.58%.