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).
Modifications to the throttle control springs for the Phantom III 31-EX model to reduce pedal load.
| Identifier | ExFiles\Box 91\3\ scan0122 | |
| Date | 8th October 1935 | |
| X 300R To Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} Copy to EY. RHD. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} 2 E/PSN.5/MN.8.10.35. PHANTOM III.- 31-EX. Reverse Throttle Carburetters - Throttle Control Springs. Re your memo. Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux}30/KW.7.10.35, we note that you have obtained a reduction in pedal load at the throttle opening position from 10 to 7 lbs. on the pedal by reducing the throttle spring load and altering the control levers to give more toggling as we instructed. We note, however, that the load throttle open of 15 lbs. is still too great. We send you herewith a print of LeC.4751 showing a new low rate throttle spring, which although it will give the same load throttle closed, will reduce the load throttle open by about 40%. We should be pleased if RHC.{R. H. Coverley - Production Engineer} would make up a set of these springs and have them sent out to GWH.{George W. Hancock - Head Chateauroux} in France. It will be unnecessary at this stage to make a modified bracket for the spring anchorage of the forward carburetter on B side, but should these springs be satisfactory and adopted for production the modified bracket shown will be required. E/PSN. Att: Print of LeC.4751. | ||