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The syntax of every intrinsic function in Quaestor is described in the wiki, see the functionsoverviewfunctions overview. The syntax above means the following.

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 Change the relation (find the relation and press F2) for Intpol_Rel_B  in

Intpol_Rel_B = DQUAD(@Hull, 2, @Frame, @Rel_B, Frame) 

which inwhich uses the same data, but now performs a quadratic interpolation. It's not necessary to initialize existing solutions. 

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  In the class Geometry, add the following relation

 X = Frame/20 * Lpp

Which relationWhich is the position in meters along the longitudinal direction of the ship. By now you should know a proper dimension, reference and determined by value should be provided. 

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 In the Top Goals class, add the following relation

Waterplane_Area = INTEGR(Hull(@X, @B_Frame, Lpp, B), 2, @X, @B_Frame, 2, 0, Lpp) 

which relationwhich is the waterplane area in square meters (m^2).

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  Add a new class, called Stability, as sub-class of Geometry. Note that a subclass is created by naming it Geometry.Stability. Add the following relation to this class:

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The dimension of all parameters is meters, and they are defined by a relation (which follows). GM is a Top Goal and should be moved toTop Goals/Undefined.

In the class Stability, enter the following relations.

Distance between keel K and center of buoyancy B, select KB and right click  "New Relation..." (or Ctrl+N). By selecting KB it is automatically presented as left side part of the relation:
          KB = 0.7 * T

Distance between keel K and center of gravity G in meters:
          KG = 0.8 * T

Distance between center of buoyancy B and metacenter M in meters:

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Moment of inertia of the waterplane area in m^4:

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Please note (and you might have experienced this in the previous tutorial too) that the parameter Moment_of_Inertia might still have a red cross and an Error warning in the knowledge base although you have provided the relation and a dimension. When this is the case, for sure you still have the Hull object in focus in a solution of the Workbase. When this is the case, Quaestor communicates that the relation you have provided cannot be used inside this object (and thus you have a red cross for Moment_of_Inertia). When you select a top node of a solution, you will see that the Moment_of_Inertia parameter is properly defined.

Third power of the width at a specified frame number in m^3:         B3_Frame = B_Frame^3

Do not forget to provide all dimensions and references, and change the Determined by fields to SYS: System/equation

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   Add the following new relation to your Top Goals:

GM_Check = LEASQ(TEXTITEM$(1), 2, "L", "GM", Lpp, 2) 

Enter the following text in the Data slot  in the Expression Editor of the relation GM_Check:TEXTITEM1 =
|0
3 "ExampleShip" "L" "GM"
"1" 1 70 0.6
"2" 2 75 0.7
"3" 3 60 0.5
"4" 4 80 0.9
"5" 5 75 0.55
"6" 6 60 0.6
"7" 7 55 0.8
"8" 8 65 0.75
"9" 9 72 0.6 
"10" 10 80 0.56|

See figure 5. GM_Check is in meters. 

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