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).
Investigation into excessive torsion on the Peregrine foot brake leverages and proposed modifications.
| Identifier | ExFiles\Box 179b\1\ img252 | |
| Date | 24th December 1932 | |
| ORIGINAL. DA{Bernard Day - Chassis Design}2/M24.12.32. Fr. FROM DA.{Bernard Day - Chassis Design} C. to WOP. WOM. HS.{Lord Ernest Hives - Chair} T. 84027. PEREGRINE FOOT BRAKE LEVERAGES. We send herewith N. sch. 3627. shewing a layout of the Peregrine brake leverages as tabulated on BS{A J. Barnes - Assistant Manager}/GKY2/MA101232. At H's instructions we have investigated the leverages given with a view to finding whether there was excessive length in the levers, or torsion in the shafts. As a result we find that the foot brake differential shaft is abnormally highly loaded in torsion approximately twice the load of the present cars. In order to overcome this difficulty we have suggested on this drawing that the levers on both the differential and on the equalising shafts should be reduced in length as shewn. This will bring back the torsion to very nearly normal. We have taken the opportunity of comparing the brake systems on our various cars with a view to seeing whether there are any outstanding differences. We notice that the 20HP. cars appear to require a much higher pedal pressure than Phantom or Peregrine to produce the same result. We shall however be going further into this matter and will write you again later. DA.{Bernard Day - Chassis Design} | ||