Maximum velocity for lifting flow over a circular cylinder occurs at top surfaces and is equal to summation of non-lifting value of maximum flow velocity,\( – 2{V_\infty }\) and vortex \(\frac{{ – \tau }}{{2\pi R}}\) therefore,\[V =  – 2{V_\infty } – \frac{\tau }{{2\pi R}}\]coefficient of lift is \[{c_l} = \frac{\tau }{{R{V_\infty }}} = 7\]therefore, \(\frac{\tau }{R} = 7{V_\infty }\); On substitution the value of \(\frac{\tau }{R}\) in the velocity equation, we get \[V =  – 2{V_\infty } – \frac{7}{{2\pi }}{V_\infty } =  – 3.11{V_\infty }\]therefore peak coefficient of pressure will be \[{C_p} = 1 – {\left( {\frac{V}{{{V_\infty }}}} \right)^2} = 1 – {\left( { – \frac{{3.11{V_\infty }}}{{{V_\infty }}}} \right)^2}\]\[ = 1 – {\left( { – 3.11} \right)^2} =  – 8.67\]