Design a four$-$bladed propeller for a $13500$ DWT chemical tanker with the following particulars

and open water diagrams provided. Determine the optimum propeller rate of rotation and pitch.

$(\frac{40}{100})$

Selected propeller type is Wageningen B$-4\mathrm{.}80$

Draught of the ship in full load condition, $T=7\mathrm{.}8m$

Propeller diameter is assumed to be $65\%T$ of the draught

Ship speed in service condition, $V_{S\{SERVICE)}=13\mathrm{.}5$knot

Wake fraction, $w_T=0\mathrm{.}345$

Thrust deduction factor, $t=0\mathrm{.}22$

Density of sea water, $=1025k\frac{g}{m^3}$

Total Resistance of the Ship obtained from Model Tests: