A four$-$stroke engine develops $18\mathrm{.}5$ kW at $250$ rpm $\mathrm{.}30+0=0(0,)$The turning$-$moment diagram is rectangular for the expansion and compression strokes. The turning moment for the expansion stroke is $2\mathrm{.}8$ times that of the compression stroke $($negative$).$ Assuming constant load, determine the moment of inertia of the flywheel to keep the total fluctuation of the crankshan speed within $+-1\%$ of the average speed of $250$ rpm $\mathrm{.}3y+0-=\mathrm{.}3x{\mathit{l}\mathit{o}\mathit{g}}_{-.x5\sqrt[(]{?}}=,{)}^{?}$