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).
The shortened front end of the frame for a B.60 Engine, Silver Ripple II.
| Identifier | ExFiles\Box 124\1\ scan0101 | |
| Date | 10th May 1939 | |
| 1044 + 1022 To Da.{Bernard Day - Chassis Design} from Da{Bernard Day - Chassis Design}/DB.{Donald Bastow - Suspensions} c. Da{Bernard Day - Chassis Design}/JD.{J. Draper - Frames} Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork} c. Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} Rm{William Robotham - Chief Engineer}/PJH. Da{Bernard Day - Chassis Design}/DB.{Donald Bastow - Suspensions}19/N.10.5.39. Shortened Front End of Frame for B.60 Engine, Silver Ripple II. ---------- PD.432 ( 2 sheets) attached to Da{Bernard Day - Chassis Design}'s copy, shows the front end of the frame shortened by 7.500", the maximum amount possible with the cast iron B.60 engine, the distance from back of dash to front wheels becoming 27.000". In view of the increased rigidity obtained by this shortening, it is possible to reduce the frame thickness, and a figure of .080" is suggested for frame, frame gusset and bent front pan. Apart from this reduction in thickness, the bent front pan is as now except for alteration in position of holes for engine mounting and radiator mounting, which will be shown on a later scheme or schemes. Either a high or low engine mounting is possible. The suspension and steering levers will be as for Wraith 80, but the B.V. yoke piece can be used; the lugs for the brake idler are not however required as hydraulic front brakes must be fitted. A new front spring will be required and particulars of this will be given later. As a temporary expedient the 850 lb. spring of which particulars were given in Da{Bernard Day - Chassis Design}/DB.{Donald Bastow - Suspensions}18/N. 9.3.39 could be used. In order to have a reasonably high steering ratio, and use an existing pendulum lever, it is suggested that for the first car the 5.875" pendulum lever of PD.229 should be used in conjunction with the Wraith III steering cam and rocking shaft; this will give approximately 2.9 turns from lock to lock. As a final scheme the B.V. steering cam and rocking shaft would be used and the pendulum lever length would be 6.625" for the same ratio. Da{Bernard Day - Chassis Design}/DB.{Donald Bastow - Suspensions} | ||