A three$-$blade propeller of a diameter of $1\mathrm{.}5$ m has a rotational speed is $60$ Hz$,$ the activity factor AF is $200$ and its static torque coefficient is $0\mathrm{.}05.$ The propeller$$s integrated lift coefficient is $0\mathrm{.}3$ b$)$ Calculate the velocity downstream of the propeller and its blade average drag coefficient while the propeller is mounted on a stationary rig. c$)$ The same propeller engine while flying, has a propulsive efficiency of $0\mathrm{.}8$ and a thrust coefficient that is $2/3$ of its static value. Calculate the propeller advance ratio and flight

speed.