Wingtip help required.

 From:  kevjon

I've come across a problem I just can't seem to solve and thought I might put out there for the experts who might be able to advise.

Does anyone have any suggestions on how to get nurb surface on the wingtip of the aircraft that creates a nice transition from the rounded front of the wing to the somewhat sharp trailing edge of the wing.

I've tried loft, rail sweep, blend and network. I've also tried many combinations of dividing the linework of the wingtip up, but so far no success.

Attached is the 3dm file to experiment with.

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