(a) Bicycle Rack When a full design specification was produced and the weighted objective procedure carried out, it was found that a tow bar mounted rack was the best solution. This would bolt to the tow bar once the tow ball has been removed. The dimensions of the tow bar bracket are as shown in FIGURE 1. The 330 mm dimension refers to the distance from the ground to the bottom of the bracket. In order to avoid the bikes fouling the car, it should be assumed that no part of either bike should protrude beyond the face of the tow bar bracket. 1 45 FIG. 1 130 -TWO HOLES 016 330 The two bikes to be carried have the dimensions shown in FIGURES 2 and 3. The width of the handlebars of the man's bike (FIGURE 2) is 420 mm whilst that of the lady's bike (FIGURE 3) is 630 mm. The width across the pedals is 360 mm in both cases. Your good friend Fred has offered to help build the bike rack and he has access to the following materials and equipment: Square section steel tubing 25 mm 25 mm, 2 mm thick Steel plate 8 mm thick Steel strips 25 mm wide by 6mm thick Brazing and welding gear A powered hacksaw A Pillar drill. Design a suitable rack that can be made using Fred's materials and equipment. It is not necessary to worry about stresses, the materials are capable of exceeding the strength requirements of any design, and the rack should be designed to 'look right'. As part of the Design Report, you should produce: (i) An arrangement drawing showing the outline of the bikes on the rack. This does not need to be very detailed or show any dimensions but should clearly demonstrate that the rack will enable the two bikes to be carried without fouling the car or the ground. (ii) A detailed engineering drawing of the rack only, showing front and side views with all dimensions required for manufacture shown on them. 430 427 FIG. 2 294 575 525 560 615 593 690 603 619 548 570 249 282 FIG. 3 293 437 440 515 695