The turning moment diagram for a multi cylinder engine has been drawn to a scale of 1mm = 325 Nm vertically and 1mm = 30 horizontally. The areas above and below the mean torque line are -26, +378, -256, +306, -302, +244, -380, +261 and -225 mm2 .
The engine is running at a mean speed of 600 rpm.
The total fluctuation of speed is not to exceed ± 1.8% of the mean speed. If the radius of gyration of flywheel is 0.7m, find the mass of the flywheel.