Question ${?}_4$

${?}^{\text{A}\text{a}\text{s}\text{t}T{i}_i-6Al-4V\text{p}\text{r}\text{o}\text{d}\text{u}\text{c}\text{t}isin\text{t}\text{h}\text{e}\text{s}\text{h}\text{a}\text{p}\text{e}ofan\text{O}\text{B}\text{L}\text{A}\text{T}\text{E}\text{S}\text{P}\text{H}\text{E}\text{R}\text{O}\text{I}\text{D}\text{,}\text{w}\text{i}\text{t}\text{h}\text{l}\text{e}\text{n}\text{g}\text{t}\text{h}}$

of semili$-$polar ${?}_{\text{a}\text{x}\text{i}\text{s}}=c=0\mathrm{.}4m$ and length of semi$-$equatorial axis $=a=0\mathrm{.}6m.($for dimensions, see FIG. O$4).$

$A=38mm$

$B=60mm$

$C=45mm$

$D=40mm$

$H=50mm$

$L=150mm$

FIG. Q$4$

Using Chvorinov's Rule, calculate the RATIO of the solidification time for the trapezoidal

prism cast product to that of the oblate spheroid cast product.