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).
The 10,000-mile test of lubricated cotton duck servo linings.
| Identifier | WestWitteringFiles\T\2January1929-June1929\ Scan256 | |
| Date | 29th May 1929 | |
| COPY. To Hs{Lord Ernest Hives - Chair}/Rn.{Mr Robinson} from Hs{Lord Ernest Hives - Chair}/GWH.{George W. Hancock - Head Chateauroux} RE. LUBRICATED COTTON DUCK LININGS FOR 'SS{S. Smith}' SERVO. We carried out tests during the 10,000 miles in France with the cotton duck servo linings lubricated. We found that upon first lubricating the servo the pedal effort necessary was increased by approx. 20% and a fair amount of pressure was required on the brake pedal at medium and slow speeds, but as the excess oil was dried up out of the linings the efficiency of the brakes improved until no more than 5% was lost. The action of the servo was very smooth, and there was no sign of any jerkiness. We found upon dismantling the servo that the linings were well saturated but no excess, all parts were well polished. A Bijur suppling 6 drops per stroke of the pump is sufficient to keep the linings in an oiled condition without excess, the supply being once in every 100 miles. Hs{Lord Ernest Hives - Chair}/G.W.Hancock. | ||