Ben; the main factor of flow resistance in an elbow is the ratio between turn radius and pipe diameter. In this case it's not so bad.
The sharpest turn is at the beginning of the channel, close to the core; where it has a useful side effect: Centrifugal force brings the flow close to the wall, reducing the boundary layer.
See? The variable radius flow channel is not casual, there’s lot of things I've thought in this design.
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