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 Peregrine foot brake leverages, identifying high torsion issues and proposing a solution by reducing lever lengths.
| Identifier | ExFiles\Box 1\10\ B001_X106 TO X 110-page031 | |
| Date | 24th December 1932 | |
| BY.{R.W. Bailey - Chief Engineer} FROM DA.{Bernard Day - Chassis Design} DA{Bernard Day - Chassis Design}2/M24.12.32. C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} HS.{Lord Ernest Hives - Chair} E.{Mr Elliott - Chief Engineer} Y106. PEREGRINE FOOT BRAKE LEVERAGES. -------------------------- We send herewith N. sch. 3627. shewing a layout of the Peregrine brake leverages as tabulated on HS{Lord Ernest Hives - Chair}/GRY{Shadwell Grylls}2/MA101232. At R'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} | ||