See normally why I say that is that, most of the ship sometime it will be easier to have
some x G, y G will not be there, because normally you would always have the centre of
gravity on the central line. So, normally this will not be there, but this will be there
because, you might want to use your mid ship as the coordinate system. So, you might
have only some kind of value of x G but not Y G, but that this is a trivial thing, never
mind this, this is only to tell you that, the same equation of motion can be easily read it in
another coordinate system, instead of centre of gravity. In other words, you have shifted
it, see I have shifted the axis system slightly forward or slightly on the star board side or
whatever, it is only for convenience because,
(( ))
Y G is,
(( ))
x G is obviously the x coordinate of centre of gravity, in other words, it is l c g simple as
that, Y G is t c g, but t c g is 0 for ships normally. So, you are in let us say, I am defining
this, all this hydrodynamic equation of motion with respect to a coordinate system with
originate mid ship
See normally why I say that is that, most of the ship sometime it will be easier to havesome x G, y G will not be there, because normally you would always have the centre ofgravity on the central line. So, normally this will not be there, but this will be therebecause, you might want to use your mid ship as the coordinate system. So, you mighthave only some kind of value of x G but not Y G, but that this is a trivial thing, nevermind this, this is only to tell you that, the same equation of motion can be easily read it inanother coordinate system, instead of centre of gravity. In other words, you have shiftedit, see I have shifted the axis system slightly forward or slightly on the star board side orwhatever, it is only for convenience because,(( ))Y G is,(( ))x G is obviously the x coordinate of centre of gravity, in other words, it is l c g simple asthat, Y G is t c g, but t c g is 0 for ships normally. So, you are in let us say, I am definingthis, all this hydrodynamic equation of motion with respect to a coordinate system withoriginate mid ship
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