14. An engine runs at a constant load at a speed of480 r.p.m. The crank effort diagram is drawn to a scale
1 mm = 200 N-m torque and 1 mm = 3.6º crank angle. The areas of thediagram above and below the
mean torque line in sq mm are in the following order:
+ 110, – 132, + 153, – 166, + 197, – 162
Design the flywheel if the total fluctuation of speed is not toexceed 10 r.p.m. and the centrifugal stress
in the rim is not to exceed 5 MPa. You may assume that the rimbreadth is approximately 2.5 times the
rim thickness and 90% of the moment of inertia is due to the rim.The density of the material of the
flywheel is 7250 kg/m3.
Make a sketch of the flywheel giving the dimensions of the rim, themean diameter of the rim and
other estimated dimensions of spokes, hub etc
