The thrust on the propeller shaft of a marine engine is taken up by 8 collars whose external and internal diameters are 660 mm and 420 mm respectively. The thrust pressure is 0.4 MN/mm? and may be àssumed uniform. The coefficient of friction between the shaft and collars is 0.04. If the shaft rotates at 90 r.p.m, find, (1) Total thrust on the collars and (ii) Power absorbed by friction on the bearing.

The thrust on the propeller shaft of a marine engine is taken up by 8 collars whose external and internal diameters are 660 mm and 420 mm respectively. The thrust pressure is 0.4 MN/mm? and may be àssumed uniform. The coefficient of friction between the shaft and collars is 0.04. If the shaft rotates at 90 r.p.m, find, (1) Total thrust on the collars and (ii) Power absorbed by friction on the bearing.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

The thrust on the propeller shaft of a marine
engine is taken up by 8 collars whose external
and internal diameters are 660 mm and 420 mm
respectively. The thrust pressure is 0.4 MN/mm? and
may be àssumed uniform. The coefficient of friction
between the shaft and collars is 0.04. If the shaft
rotates at 90 r.p.m, find,
(i)
Total thrust on the collars and
(ii) Power absorbed by friction on the bearing.

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