From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Design and integration of rear springs and their fixings for the 'Myth' scheme.
| Identifier | ExFiles\Box 110\3\ scan0005 | |
| Date | 2nd September 1940 | |
| To Rm{William Robotham - Chief Engineer}/GB. c. to Rm.{William Robotham - Chief Engineer} c. to Rm{William Robotham - Chief Engineer}/EAG. c. to Rm{William Robotham - Chief Engineer}/HH. 746 Ev.{Ivan Evernden - coachwork}10/JH.2.9.40. Rear Springs & Fixings Myth. You are aware that we have given certain dates for the completion of Myth schemes and that we are looking to you with the help of Mr. Cantrill to provide schemes for the rear springs and their attachment to the axle and the body. We appreciate the usefulness of the investigation work which you are carrying out in connection with the best arrangement and proportions for the rear shackle, but we suggest that in the meantime Mr. Cantrill should be making a preliminary project of the actual design as by so doing new problems will be brought to light before we have finalised too much of the detail. We are asking Rm{William Robotham - Chief Engineer}/HH to release Mr. Cantrill immediately from the engine arrangement which he is in the process of drawing. We see no objection to lowering the rear spring bodily from the position already projected by an amount of .5 or even .750" if it is considered that the risk of introducing sideways shake at the rear is more than outweighed by the advantages gained in the increased rigidity of the bottom side of the body. At the same time we suggest that Mr. Green has not made the best of the compromise possible in the design of the bottom side in the vicinity of the front end of the rear springs and we suggest that certain slight modification to the heel board and floor would permit of a more gradual change of section in the bottom side. We feel this should be done following Wraith III designs together with the lowering of the spring. We understand that Rm{William Robotham - Chief Engineer}/EAG. is anxious to receive from us the shape of the rear spring on full bump and full torque. This is naturally somewhat indeterminate and ample clearance is to be allowed between the spring clips and the frame if the gaiter is not to be P.T.O. | ||