Sanding monohull running surfaces

[riggerman]

Sanding the bottom of the Wild thing im maintaining a razor sharp edge where the transom meets the hull bottom .What about where the spray rails meet the chine does this area have to be razor sharp or should it be rounded off? Any response would be good.

 

[Rickracer]

You want all edges under the boat to be sharp, especially the lifting strakes and the transom edge. That makes the water separate from the hull rather than follow the curves. "Blueprinting" a bottom can make a considerable difference, as it make the hull do what it is designed to do even better. B)