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).
Effects of adding weight to the brake drum to mitigate high-speed tramping.
| Identifier | ExFiles\Box 84\2\ scan0228 | |
| Date | 17th December 1934 | |
| -6- HM{Capt. W. Hallam - Head Repairs}/RM.{William Robotham - Chief Engineer}2/KM.17.12.34. We are apprehensive of adding more weight to the brake drum in case it lowers the road speed at which high speed tramping can occur, by increasing the transverse moment of inertia of the front axle. We do not think that it is generally appreciated that whilst almost every other part of the Bentley is more highly stressed than the corresponding part of the Phantom and 20/25, the brake area per ton weight is at present 24% greater than that of the Phantom, and 20% greater than the 20/25. HM{Capt. W. Hallam - Head Repairs}/RM.{William Robotham - Chief Engineer} | ||