The propeller shaft (or tailshaft) is supported in a stern tube bearing of one of a number of designs. The bearing, being at the end of the shaft, is affected by the overhanging weight of the propeller. The propeller mass pulls the outer end of the shaft down, so that there is a tendency for edge loading of the stern tube bearing to occur. The forward part of the propeller shaft is tilted upwards. Weardown of the bearing aggravates this misalignment and whirl due to weardown may give additional problems.
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Answer:
The propeller shaft (or tailshaft) is supported in a stern tube bearing of one of a number of designs. The bearing, being at the end of the shaft, is affected by the overhanging weight of the propeller. The propeller mass pulls the outer end of the shaft down, so that there is a tendency for edge loading of the stern tube bearing to occur. The forward part of the propeller shaft is tilted upwards. Weardown of the bearing aggravates this misalignment and whirl due to weardown may give additional problems.
Explanation:
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