• Documentation of the macros
• m_stab data
• m_stab commands
• m_stab log
• m_stab output

This sample shows how to use our automated stability macros to assess the stability of a single condition, or to find an allowable condition. The data file is much like that for the other samples here, except that it contains the line:

use_mac stab

STAB_OK produces the righting arm, heeling arm, and area ratio curves for the draft specified. Since the righting arm is based on the equilibrium of the buoyancy and weight of the vessel, the vessel weight must have been previously defined. This is accomplished here with the stanza:

   $
   $*********************************     set transit condition
   $
   &INSTATE -CONDITION 7
   $
   $*********************************      compute weight for cond.
   $
   &WEIGHT -COMPUTE  5 32 85 85

   $
   $**************************************      check one intact
   $
      stab_ok 5 2.5 10 -wind 100 -yaw 0
   $
   $**************************************      check one damaged
   $
      stab_ok 5 2.5 10 -wind 100 -yaw 0 -damage 5p

The command:

    kg_allow -draft       5       \
             -wind        100  50 \
             -damage      5p      \
             -yaw         0 45    \
             -i_ar_ratio   1.4 \
             -i_arm_ratio    0 \
             -i_down_h       0 \
             -i_gm           0 \
             -i_are@marm     0 \
             -i_are@dfld     0 \
             -i_are@40       0 \
             -i_arm_ar       0 \
             -i_zcross      90 \
             -i_theta1      90 \
             -i_range        0 \
             -i_ang_diff     0 \
             -i_dang_t1      0 \
             -i_dang         0 \
             -i_ang@marm     0 \
             -d_ar_ratio     0 \
             -d_arm_ratio    0 \
             -d_down_h       0 \
             -d_gm           0 \
             -d_are@marm     0 \
             -d_are@dfld     0 \
             -d_are@40       0 \
             -d_arm_ar       0 \
             -d_zcross      90 \
             -d_theta1      90 \
             -d_range        0 \
             -d_ang_diff     0 \
             -d_dang_t1      0 \
             -d_dang         0 \
             -d_ang@marm     0