Design a cast iron flywheel for a four-stroke cycle engine to develop 110 kW at 150 r.p.m. The work done in the power stroke is 1.3 times the average work done during the whole cycle. Take the mean diameter of the flywheel as 3 meters. The total fluctuation of speed is limited to 5 percent of the mean speed. The material density is 7250 kg / m3. The permissible shear stress for the shaft material is 40 MPa and flexural stress for the arms of the flywheel is 20 MPa.