Filleting 2 multi directional surfaces

Okay so I am trying to currently building a trimaran in Rhino and having an issue that’s bugged me for 2 days now.

I have the outer hull side and then the blend which will go between 2 hulls.
I am using the solid tool fillet edges, and distance from edge as the fillet type. However there is one surface that is part of the solid that won’t fillet.

Hull blend.3dm (9.4 MB)

Any help would be much appreciated.

make a pipe along the entire edge split the surfaces with it and delete the parts, then use BlendSrf.
i had approximate the upper part where the surface ends with surfaces normal to it to split the edge. so please to that from scratch.

Hull blend3.3dm (10.3 MB)

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Thanks for the reply, that has saved me so much time :+1:.
I never would have thought about using the pipe tool for this, still got lots to learn.

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