$5.$ A wing with a diamond shaped $2$D airfoil has a chord length $9$ in and a wing span of $9$ inches. $($into the paper$)$ The following drag forces are measured when placed in a wind tunnel at sea$-$level standard conditions:

a$)$ Calculate the Reynolds number based on chord length for each velocity.

b$)$ Calculate the drag coefficient $\backslash (\backslash$mathrm$\{$C$\}\_\{\backslash$mathrm$\{$D$\}\}\backslash )$ for each velocity.

c$)$ Find a curve fit of form $\backslash (\backslash$mathrm$\{$C$\}\_\{\backslash$mathrm$\{$D$\}\}=\backslash$mathrm$\{$A$\}\backslash$mathrm$\{$Re$\}\{\}^\{\backslash$mathrm$\{$B$\}\}\backslash )$ to this data. You may use a spreadsheet, Excel?

d$)$ Use the curve fit to predict the drag force of a similar $15-$in chordlength diamond airfoil with $15-$in span placed at similar orientation in $\backslash (20^\{\backslash$circ$\}\backslash$mathrm$\{$C$\}\backslash )$ water flowing at $\backslash (2\mathrm{.}2\backslash$mathrm$\{$~m$\}/\backslash$mathrm$\{$s$\}\backslash ).$ You will have to extrapolate the curve fit beyond the calculated Reynolds number range.