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 Topic     Marine Propulsion
    Title Author          Date & Time 
         How the ship is moving foreward?? Akhil... 18 Apr 2008 19:22
           Re: How the ship is moving foreward?? Akhil... 19 Apr 2008 15:21



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Title:     How the ship is moving foreward??
Author: Akhil... Posted on: 18 Apr 2008 19:22
 Click here to contact the author Posting ID #589
 
The title will seem very simple ...but is worth discussing.I am a marine engineering cadet,now in fourth year and the topic has given rise to lot of arguements...
One view is that as the propeller rotates it produces the effect of a screw,ie,if a nut is kept stationary and if bolt is rotated the bolt moves foreward or backward.similarly the propeller is rotating and the water column is stationary,so a thrust is produced on the propeller shaft.this thrust is absorbed by the thrust block which transfers it to the hull and the ship moves foreward.
Another view is that when a propeller rotates it displaces the water present in the area between the propeller and the hull.this creates a low pressure area there and water from surrounding area goes there and directly apply a pressure on the ship's hull by virtue of which she moves foreward...
 
 



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Title:     Re: How the ship is moving foreward??
Author: Akhil... Posted on: 19 Apr 2008 15:21
 Click here to contact the author Posting ID #597
 
a lot of views are shown in statistics..why does'nt anyone post a comment or reply????