The ratio, $($propeller agitator dia$/$tank dia$)$ is normally taken as

$0\mathrm{.}15-030$

$0\mathrm{.}5-0\mathrm{.}65$

$0\mathrm{.}75-0\mathrm{.}85$

$0\mathrm{.}60-0\mathrm{.}90$