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).
1100 miles of road and brake tests on a Hispano car.
| Identifier | WestWitteringFiles\L\2Jan1924-March1924\ Scan20 | |
| Date | 1st January 1924 | |
| R.R. 493A (40 H) (SL 42 12-7-23). J.H. D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. ORIGINAL Expl. No. 4214 1559 REF: Hs{Lord Ernest Hives - Chair}4/L629.1.24. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. RG.{Mr Rowledge} c. to DA.{Bernard Day - Chassis Design} E.{Mr Elliott - Chief Engineer} c. to BY.{R.W. Bailey - Chief Engineer} WOR.{Arthur Wormald - General Works Manager} ROAD TESTS ON HISPANO CAR. We have completed 1100 miles on the road carrying out intensive brake tests - the conditions being equal to the tests on the 40/50 HP. We consider this mileage is equal to at least 4400 miles under average severe conditions. The brakes behaved very well throughout the test and no adjustments whatever were made. After 750 miles running, the driver reported that the rear brakes came on before the front and caused the car to skid round on a greasy road. We took careful measurements before and after the run - the wear at the finish was as follows :- Servo nil. Front brakes nil. Rear brakes 1/16" on end of lever operating cam - approx. .004" wear on liners. As this car has no equaliser between the front and rear and the fact that wear was only on the rear brakes, should have made it that the front brakes were doing most work. We can only account for the rear doing most braking by the front ropes having stretched. We are watching this point on further tests. It was necessary to give the turn buckle adjustment for the front brakes one and half turns to equalize the brakes again - they were then equal to when they started the test. Hs.{Lord Ernest Hives - Chair} | ||