`Demonstrates when GM appears on plots and when it does not.

proj ra-gm
read tanker
report
draft 5
vcg 5
solve weight, lcg

angles 0 2.5 ... 60

ra   `<--- GM plotted at equilibrium.
heel 5
ra   `<--- GM does not appear - the curve starts after equil.
heel -5
ra   `<--- GM plotted at equilibrium, where the curve crosses the axis.

hmmt 2000

ra   `<--- GM plotted where the RA curve crosses the HA curve.
solve
ra   `<--- Same, but curve starts at equilibrium.

hmmt off
solve

vcg  7
ra   `<--- Negative GM plotted at first (unstable) equilibrium.

heel 1
ra   `<--- GM plotted at stable equilibrium since curve starts after zero.

tank cgs1.s
load 1.0
type spill
ra   `<--- GM does not appear - curve is righting moment since displ varies.

report off
print ra-gm /preview