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).
Comparison of braking proportions for the Phantom III against other models like Bentley and Wraith.
| Identifier | ExFiles\Box 92\4\ scan0377 | |
| Date | 30th October 1937 | |
| To Cx.{Major Len W. Cox - Advertising Manager} c. to Hs.{Lord Ernest Hives - Chair} c. to Sg.{Arthur F. Sidgreaves - MD} c.to Hy.{Tom Haldenby - Plant Engineer} c. to Da.{Bernard Day - Chassis Design} 306 Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale}8/JH.30.10.37. PHANTOM III BRAKES With reference to Cx.{Major Len W. Cox - Advertising Manager}5/Kw.28.10.37. The proportion of braking front: Rear on Phantom III us :- Present Phantom III 0.69 : 1 As projected (J2-MX{John H Maddocks - Chief Proving Officer} in France) 0.865 : 1 This compares with other cars as follows :- (Present Bentley II, 45° servo cams 0.82 : 1 (A series " " 35° " 0.96 : 1 (Bentley II A 1.15 : 1 (Bentley III (Projected) 1.32 : 1 25-30 H.P. 1.13 : 1 Wraith 26.G.VI. in France. 1.32 : 1 Future Wraiths 1.22 : 1 The present amount of front braking on Bentley is inadequate on a sports car, and gives a stopping distance of 40 feet from 30 m.p.h.: the limitation on the present Bentley has been judders in the past, and now is axle strength. Bentley III front suspension will be better, and stronger. The 20/25 and 25/30 chassis always have had good brakes and the Wraiths are similar, the weight on the front axle of Wraith having been increased, as compared to 25/30 H.P., the | ||