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).
Analysing the effect of increasing the rear axle hypoid on the coachwork of models B.III, B.50, and Wraith 80.
| Identifier | ExFiles\Box 98\1\ scan0128 | |
| Date | 15th September 1938 | |
| 402 also 1015 #1015 F.DODD To Da.{Bernard Day - Chassis Design}. from Ev.{Ivan Evernden - coachwork} c. By.{R.W. Bailey - Chief Engineer} Rm.{William Robotham - Chief Engineer} Da{Bernard Day - Chassis Design}/Hdy.{William Hardy} c. Rm{William Robotham - Chief Engineer}/Gry.{Shadwell Grylls} Da{Bernard Day - Chassis Design}/Ev.{Ivan Evernden - coachwork}8/N.15.9.38. Re: Semi Floating Rear Axle, B.III, B.50 & Wraith 80. We have made an analysis of what good the coachwork derives from the increase of Hypoid in the rear axle from .650 to 1.500. We will deal with each car separately with reference to the attached layout of the propeller shaft on full bump and the corresponding rear heel-boards and floors: B.III. The rear seat heelboard is 25.250 in front of the rear axle, and is therefore nearer the intermediate bearing than the axle. The amount of hypoid therefore does not materially effect the height of the pot over the propeller shaft. B.50. The rear seat heelboard is only 2.250" further aft than B.III, and our remarks concerning B.III, apply almost equally to this car. If we should at any time wish to lower the B.50 rear floor to that of B.III, to emulate the Cadillac 60 Special, the attached print shows that even then our remarks still hold good. Wraith 80. The size of the pot in front of the heelboard is little effected by the increase of hypoid. The rear floor can never be lowered with the present wheelbase due to the frame and cross. A lower floor could be obtained only at the expense of an increase in the wheelbase. In that case the floor falls at the rate with which the top of the frame slopes. The reduction in the size of the pot would be not more than .500. Continued... | ||