It doesn't matter whether use_flip is set to True or False, normals always end up pointing outwards!
http://www.blender.org/documentation/blender_python_api_2_66_4/bmesh.ops.html#bmesh.ops.recalc_face_normals
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the name `use_flip` is misleading, option in fact tags faces that have been flipped, rename to `use_face_tag`
committed 56221, closing.
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so this is for recalcing faces outside, for inside i would have to call bmesh.ops.reverse_faces afterwards