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Surface roughness for maximum speed

Surface roughness for maximum speed

Surface roughness for maximum speed

(OP)
Does anyone know of testing that shows what affect the surface roughness of the hull has on speeds over 100 mph?
I've heard of recent testing that indicated a smooth surface was superior, but people who race say sanded to 220 grit is the fastest surface.
I was considering coating the running surfaces with an epoxy/graphite mix. If this produced increased drag or reduced drag I would be interested in actual test results or experience.
This is concerning an air entrapment hull at speeds over 100 MPH.

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