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Hi, I'm modeling a ship hull and have generated a ruled surface between two generic curves (see the attached figures). However as you can see the surface doesn't look good slightly forward of LOA/2 and forward to the stem. The surface also bends inward, creating a curved surface and I'm wondering how I can fix these issues. I want the surface to be completely flat between the two generic curves and thought that a ruled surface should work, but I do not really know if a ruled surface is the best choice and if it can be controlled like I want to. If anyone can explain how I can control the surface and make it completely flat that would be great. Thanks, Best regards, Gustaf

Hi folks please find attached a Feature Definition for a "Bulbous Bow Shape Analysis" and a Feature Definition which can be used in a CurveEngine for creating a MetaSurface. shapeAnalysis_Bulbous_Bow.fdf bulbous_bow_section.fdf [edited 05.10.14 - tangent analysis included] In order to replace a Bulbous-Bow-IGES-Import by a fully parametric MetaSurface you can use this Feature by execute the following steps: Create a Surface Group including all the IGES-surfacesCreate a new Feature Definition and reload the Analysis-Feature, apply and create the Feature by right click on the Feature Definition>Create FeaturePass the Surface Group to the Analysis-Feature and enter (if necessary) start- and end-position in x-direction of the bulbous bowAdditionally give a number of offsets (30-50 should be a good choice)Run the Feature This will create function curves which can be used to create a MetaSurface. The next steps should be: Re-model the function curves by e.g. FSplineCurvesCreate parameters for some values of the new curves, like start/end position, start/end tangent or area Create a CurveEngineCreate a new Feature Definition, reload the Section-Feature and applySelect the Bulbous-Bow-Section-Feature and pass the new function curves to the EngineAdditionally you can set start- end end-tangent valuesCreate a MetaSurface, select the Curve Engine and set the base positions according to the start- and end-position in x-directionNow you will have a single Metasurface, which is parametric and ready for a design study. Cheers Matthias