What counts as lateral area?

[RobinJ]

I’m modelling the Onvi 435 rudder which is a hybrid rudder with a mix of skeg and kick-up. Since the skeg rudder is shaped like a U-block, it has an interior and exterior; is the interior calculated as extra lateral area? Same for the upper exterior portion of the kick-up rudder? Because if so then the upper portion of the rudder have 3 times the lateral area than in reality.

I guess if that’s the case it would be better to fuse into one object

[Marven]

Theoretically the lateral area is the projected under water area as seen from one of the sides

[RobinJ]

thank you, so the little space between the kick-up rudder and skeg-rudder doesn’t count for lateral area?

[Author]

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