## Light Ship Weight EstimatingHere is an overview of the method for estimating a design's light ship weight and some of the figures used for estimating w100, w200, w300, w500, and w600 weights related to overall vessel dimensions and other principle characteristics. In
general for w100 weights, I have plotted them against the vessel's
cubic number (which is equal to the vessel's length x beam x hull
depth).w100 - Structures Weight -
- The
**Black**line represents a curve fit through all the data points except**nuclear** - The
**Gray**data points and line represents a curve fit through all data points for vessels with nuclear powered steam plants - The
data points and line represents a curve fit through all data points for vessels with conventional steam plants*Brown* - The
data points (with*Green*centers) and line represents a curve fit through most of the data points for vessels with diesel plants.*Green* - The
data point with the*Green*center represent diesel propelled fast attack craft, whose plants appear to be lighter than the diesel plants on the other lower speed vessels.*Yellow* - The
data points (with the*Red*center) and line represent vessels with*Red*(*Combined Diesel or Gas Turbine*) power plants*CODOG* - The
data points with the*Red*center represents*Yellow*propelled fast attack craft, whose plants appear to be lighter than the*CODOG*plants on the other lower speed vessels.*CODOG* - The
data points (with the*Blue*center) and line represent vessels with*Blue*(*Combined Gas Turbine and Gas Turbine*) power plants*COGAG* - The
data points with the*Blue*center represents a*Yellow*propelled fast attack craft, whose plants appears to be lighter than the*COGAG*plants on the other lower speed vessels.*COGAG*
For w300 weights I have plotted the
total electrical plant weight versus the installed electrical power, as
shown below. Where possible I've tried to show which data points
represent different plant types, however, right now I only show a
single trend line through all the data points. w300
- Electric Plant Weight -
Pre-Processor
sheet, eventually it will become necessary to come up with a better
estimate of some of the individual subcomponents of this group. As such
below is a graph of w410 through w440 versus cubic number,
which should help users in making a better estimate of these weights as
their designs are developed. In general, represent weights within the w440
group that may be more related to overall vessel size than some of the
other components, and thus may vary from the intial estimates made in
the w400 section, especially if the size of the
vessel is varied. For reference;Pre-Pocessorweights represent a vessel's Command & Control weights,*w410*weights represent a vessel's Navigation System weights,*w420*weights represent a vessel's Interior Communications System eights, and*w430*weights represent a vessel's Exterior Communication System weights*w440*
Additionally, a second
graph of just weights is
also provided below as some of the cost estimating methodologies I have
been reviewing treat the weights for these groups slightly differently
than the rest of the w430 weights.w400 |