Airfoil surface finish

Date:         03 Oct 99 18:18:23 
From:         "davidwells" <>
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I am having difficulty finding information on the benefits of improved
surface finish on airfoils in gas turbine engines (ie. fan blades and
compressor blades and vanes).

Also, someone has suggested that there may be an optimum limit (around
12 micro-inches) for airfoils beyond which SFC won't improve.

I have tried AIAA but without much success - does anyone have any ideas
where such information can be obtained ?

Are any of the airlines trialing processes such as Rem Chem and/or
Rosler vibratory finishes for the SFC benefits ?