Problem $3(20)$

A $16350$ Kg business jet flying straight and level at $6500$m and $180$m$/$s with cD$0=0\mathrm{.}02,$ e$=0\mathrm{.}8,$ wing area$=48\mathrm{.}3$

m $2$

$,$ wingspan$=19\mathrm{.}6$ m$.$ The aircraft is equipped with two turbofan engines with total specific fuel consumption

sfc$=20\mathrm{.}0$ g$/$kN$/$s$.$ Jet engine fuel Jet A$-1$ has a heating value of $43\mathrm{.}15$ MJ$/$kg$.$

$1-$ Find the thrust required $($in Newton$)$ to fly straight and level at this altitude.

$2-$ Find the fuel flow rate $($Kg$/$hr$)$ and the overall efficiency of this aircraft