The Beechcraft Model $1900$D $$ a propeller$-$driven aircraft $$ has a total mass of

$2$

$7000$ kg and wing area of $28\mathrm{.}15$ m$2.$ Drag polar CD $=0\mathrm{.}035+0\mathrm{.}032$CL $.$ Propeller

efficiency $=90\%.$ Estimate the shaft$-$power required to cruise at $500$ km hr$-1$ TAS and $3$km altitude $($relative density $=0\mathrm{.}742).$