SAMPLE PROBLEM 1.4 The rigid beam BCD is attached by bolts to a control red at B, to a hydraulic cylinder at C, and to a fixed support at D. The diameters of the bolts used are: da donde in Each bolt acts in double shear and is made from a steel for which the ultimate shearing stress is 7,40 ksi. The control rod AB has a diameter din. and is made of a steel for which the ultimate ten- sile stress is or-60 ksi. If the minimum factor of safety is to be 3.0 for the entire unit, determine the largest upward force which may be applied by the hydraulic cylinder at C.