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21. The thrust of a propeller shaft in a marine engine is taken up by a number of collars integral with the shaft which is 300 mm in diameter. The thrust on the shaft is 200 kN and the speed is 75 r.p.m. Taking u constant and equal to 0.05 and assuming intensity of pressure as uniform and equal to 0.3 N/mm², find the external diameter of the collars and the number of collars required, if the power lost in friction is not to exceed 16 kW.

21. The thrust of a propeller shaft in a marine engine is taken up by a number of collars integral with the shaft which is 300 mm in diameter. The thrust on the shaft is 200 kN and the speed is 75 r.p.m. Taking u constant and equal to 0.05 and assuming intensity of pressure as uniform and equal to 0.3 N/mm², find the external diameter of the collars and the number of collars required, if the power lost in friction is not to exceed 16 kW.

Elements Of Electromagnetics
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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e in a marine engine is taken up by a 300 mm in diameter: The thrust on the shaft is 20( equal t0 0.05 and assuming intensiry of press diameter of the collars and th, 16 kW, e number of
121. The thrust of a propeller shaft in a marine engine is taken up by a number of collars integral with the shaft which is 300 mm in diameter. The thrust on the shaft is 200 kN and the speed is 75 r.p.m. Taking H constant and equal to 0.05 and assuming intensity of pressure as uniform and equal to 0.3 N/mm, find the external diameter of the collars and the number of collars required, if the power lost in friction is not to exceed 16 kW.
Transcribed Image Text:121. The thrust of a propeller shaft in a marine engine is taken up by a number of collars integral with the shaft which is 300 mm in diameter. The thrust on the shaft is 200 kN and the speed is 75 r.p.m. Taking H constant and equal to 0.05 and assuming intensity of pressure as uniform and equal to 0.3 N/mm, find the external diameter of the collars and the number of collars required, if the power lost in friction is not to exceed 16 kW.
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