A compound epicyclic gear train is shown in Fig. 15.28. The gears A, D and E are free to rotate on the axis P. The compound gear B and C rotate together on the axis Q at the end of arm F. All the gears have equal module. The number of teeth on the gears A, B and C are 18, 45 and 21 respectively. The gears D and E are annular gears. The gear A rotates at 120 rpm ccw and the gear D rotates at 450 rpm cw. Find the speed and direction of the arm and the gear E. B A E Fig.15.28 Compound epicyclic gear train