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 Topic     PARALLEL BODY LENGTH & shell expansion plan
    Title Author          Date & Time 
         PARALLEL BODY LENGTH & shell expansion plan CAPTGNVR 10 Apr 2009 03:21
           Re: PARALLEL BODY LENGTH & shell expansion plan vishalsingh 2 Sep 2011 06:54



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Title:     PARALLEL BODY LENGTH & shell expansion plan
Author: CAPTGNVR Posted on: 10 Apr 2009 03:21
 Click here to contact the author Posting ID #632
 
Dear All

Can anyone give me links or guidance as to how to calculate parallel body lengths at light ship, ballast and fully loaded condition using shell expansion plan or by any other means.

Not too much aware to deduce information from the shell expansion plan.

Awaiting ur help
 
 



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Title:     Re: PARALLEL BODY LENGTH & shell expansion plan
Author: vishalsingh Posted on: 2 Sep 2011 06:54
Click here to view author's profile Click here to contact the author Posting ID #685
 
Dear Sir,
I hope u remember me ... i cud instantly recognize u reading ur username as Capt GNVR ... hope u r doing good & in best of health and spirits....
I have used shell expansion plan for calculating parallel body (PB) lengths for different drafts. The accuracy depends on the scale of the plan. Its not 100% but is accurate enough.
Calculate the freeboard for the draft u need the PB, convert it to the scale of the plan (in cms or mm) and thn measure that distance from the deck line to the "side tangent line". For example if ur freeboard to the scale is Xcm then u have to find a point (point Y) on the deck line whre the distance between the deck line and the side tangent line = X cm, in other words from a point Y (on deck line) draw a perpendicular line to the deck line intersecting the side tangent line measuring Xcm & then measure the the distance between Point Y and midships to get ur PB aft of midship. Fwd of midship is relatively simple as the PB doesnt change much with the draft when measured fwd of midship. U cud easily find the side tangent line running almost vertically and intersecting the deck line at some point. From this point measure the distance to midship, which shud give u the PB fwd of midship.
Hope my reply is of some help ...
regards, Vishal Singh
vishalsingh22@gmail.com