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For fillet cutwater design the spiral and the diffuser are trimmed and rounded at their intersection curve.
Prerequisites:
•The wrap angle must be high enough so that spiral and diffuser intersect.
The corresponding fillet radius can be specified. Additionally, the Diffuser base form factor defines the roundness of the first diffuser cross section on its base side and is between 0.2 and 1: •0 = cornered base side (like spiral section) •1 = full rounded base side The factor affects the shape of the intersection curve and therefore the shape of the cutwater. A high value could help to get an intersection of spiral and diffuser as a precondition for fillet cutwater. 
Diffuser base form factor for a round spiral cross section
Compares diffuser base form factor of 0.2 and 1.0 for a spiral cross section of type line segments
The Spiral start position indicates the angular position at which the spiral begins and influences the intersection of spiral and diffuser. It has to be at least 1° and must be lower than the intersection position of spiral and diffuser. If Automatic is activated the optimal angular position is determined automatically.
The Surface transition defines the transition from the side patch surfaces to the central fillet surface:
•Tangential: Tangential transition between both surfaces (Timeconsuming)
•Nontangential: No tangential transition between both surfaces
•Automatic: Tries tangential transition. If it fails, a nontangential transition is used. (Timeconsuming)
If the fillet cutwater mode has been chosen, the 3Dmodel is set to the model state "Solids only" after every update of the design because only then the spiral and diffuser surfaces that are trimmed according to the fillet are visible. 