power number n ( p ) has been correlated with the reynolds n ( re ) and the bottom clearance numbers n ( c ) by the expressions \\documentclass { article } \\pagestyle { empty } \\begin { document } $ $ n_p = 13,465n_ { \\rm re } ; { -0.774 } n_c ; { 0.1016 } n_ { \\rm re } < 80.000\\\\n_p = 5.4n_ { \\rm re } ; { -0.0863 } n_c ; { 0.104 } n_ { \\rm re } > 80.000 $ $ \\end { document } power and reynolds numbers are defined as usual with the square root of the board-immersed-area as the characteristic length .
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