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Chapter $12$

$\backslash$table$[[$Wing$,,($metric$)],[S_{\text{r}\text{e}\text{f}-\text{w}\text{i}\text{n}\text{g}},=279\mathrm{.}4,\{26\mathrm{.}0\}],[S_{\text{e}\text{x}\text{p}-\text{w}\text{i}\text{n}\text{g}},=230\mathrm{.}4,\{21\mathrm{.}4\}],[$A true,$=9\mathrm{.}6,],[$Lambda$,=0\mathrm{.}6,],[\frac{C_t}{C_r},,],[$Sweep$-$LE$,=2\mathrm{.}0,],[\frac{t}{c}$ average,$=0\mathrm{.}088,],[$Delta $Y,=1\mathrm{.}768,],[C_L-$design,$=0\mathrm{.}5,],[C_{Lmx}-$airfoil,$=1\mathrm{.}9.,],[x($quarter$-$chord$),=12\mathrm{.}0,\{3\mathrm{.}7\}],[$Horizontal Tail,,$],[$S$-$tail,$=70\mathrm{.}0,\{6\mathrm{.}5\}],[S_{\text{e}\text{x}\text{p}-\text{t}\text{a}\text{i}\text{l}},=47\mathrm{.}5,\{4\mathrm{.}4\}],[$A true,$=6\mathrm{.}0,],[$A effective,$=6\mathrm{.}0,],[$Lambda$,=0\mathrm{.}57,],[5\frac{C_t}{C_r},,],[$Sweep$-$LE$,=4\mathrm{.}6,],[t^{\text{'}}c$ average,$=0\mathrm{.}08,],[$Delta $Y,=1\mathrm{.}629,],[x($quarter$-$chord$),=34\mathrm{.}0,\{10\mathrm{.}4\}],[$Fuselage$,,],[S_{\text{w}\text{e}\text{t}},=516\mathrm{.}9,\{48\mathrm{.}0\}],[$length$,=35\mathrm{.}5,\{10\mathrm{.}8\}],[$diam$-$effctiv,$=6\mathrm{.}1,\{1\mathrm{.}9\}],[Q($interfer$),=1\mathrm{.}1,],[$Upsweep deg,$=10\mathrm{.}0,],[x($nose$),=0\mathrm{.}0,\{0\}]]$

$1004$

Aircraff Design: A Conceptual Approach

$12\mathrm{.}1$ For the aircraft just defined, prepare the wing lift curve at Mach $0$ and at Mach $0\mathrm{.}6.$ Also graph lift$-$curve slope vs Mach up to Mach $2.$

$12\mathrm{.}2$ Estimate $M_{DD}.$ Calculate total parasitic drag at Mach $0\mathrm{.}01$ and Mach $0\mathrm{.}6$ at sea level using the component buildup method $($assume turbulent flow$).$ Compare to result via the equivalent skin$-$friction method. Which is better? Easier?

$12\mathrm{.}3$ Calculate drag due to lift at $C_L=0\mathrm{.}5$ and $C_L=0\mathrm{.}9$ using the LE suction method. Compare to result via the Oswald method. Which is better? Easier?

$12\mathrm{.}4$ True$/$false$/$neither$?$ Why? $"$CFD should only be used after the external lines of the aircraft are finalized and is really not suited to conceptual design."