GHS TIPS

 

Forces a given point on the stern down to a given height above the water.
proj skypt
read fv
`Initial condition:
draft = 7
vcg = 8
solve weight, lcg
`The given point:
part hull
ref = 40, 0, 12
`The desired height of this point above the water:
variable wantht
set wantht = 2.0
`The point at which the weight is applied is given in the ADD command below.
macro try
ADD "Downward force at stern", {f}, 40a, 0, 12 /nowarn
`message trying force = {f}
solve
set dh = {height} minus {wantht}
if {dh} > 0 then set f = {f} plus {df} else set f = {f} minus {df}
set df={df} mult 0.6
/
variable f,dh,df
set dh = {height} minus {wantht}
set f = {fweight} div {depth} times {dh} div 2
set df = {f} div 2
\ Initial height: {height:2}
.try (15)
\ Final height: {height:2}
status

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