Abstract
Mitsubishi Heavy Industries, Ltd. (MHI) succeeded in retrofitting the contra-rotating propeller system to a car carrier first in the world in August, 1988, as a rusult of five years technical studies concering the contrarotating dual shafts. Through the sea trials and commercial operation for two years, large energy saving merit and sufficient reliability were verified; i.e.(1) The energy saving was 16% on the sea trials and 13.5% in average (about 10-17%) in the ship's service operation.(2) The results of bearing temperature and oil film thickness measurements were found to be almost as designed, and no abnormal condition was observed in the bearings, gears, etc. as a result of the overhauling after one year.This paper describes the technical features and the contents of the verification concerning the MHI-type Asynchronous Contra-Rotating Properller (ACRP) shafting system.
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