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Forces a given point on the stern down to a given height above the water.
    proj skypt
    `Forces a given point on the stern down to a given height above the water.
    `Note: Beginning with version 8.16 this can also be done with a negative
    `ground reaction.
    
    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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