To perform hydrostatic computation with MOSES, one should issue the command


from the main menu. This command will place the user in the Hydrostatics Menu, where he can compute hydrostatic results for a single body. The body which will be considered will be either the current body, or the one specified on the HSTATICS command. In this menu, MOSES can perform four classes of hydrostatic analysis:

Unless specified, the results obtained will be computed assuming that the water surface is flat. To consider the effect of a wave, one can use the option:


on any of the commands in this menu. Here, WLENGTH is the length of the static wave (feet or meters), STEEP is the reciprocal of the wave steepness, and CREST is the distance of the crest from the vessel origin (feet or meters). Notice that the wave height here is obtained by MOSES as the quotient WLENGTH/STEEP. Once specified, the wave will remain in effect until it is nullified by specifying a -WAVE option with zero height.

As far as MOSES is concerned, there is no difference between hydrostatic properties for an intact vessel and a damaged one. There are simply a different set of active compartments for one analysis than for another. As an example, suppose that one had just performed a set of righting arm computations for an intact vessel. To perform a similar analysis for a damaged condition, he would simply issue a &COMPARTMENT -FLOOD :TNK command to tell MOSES which tanks or compartments he wished to flood. Next, he would issue the EQUI command to find the floating damaged position, and then issue a RARM command to examine the stability of the damaged system.