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 performance and issues of various vehicle components, including the brake pedal, gearbox, and axle.
| Identifier | ExFiles\Box 82\3\ scan0266 | |
| Date | 11th May 1935 guessed | |
| ( 8 ) 8) BRAKE PEDAL TO N.SCH 400 The brake pedal has given no trouble. 9) CANTILEVER PEDALS N.SCH 4156 TO SUIT RUBBER ENGINE MOUNTING The Clutch pedal has to be set down to 5.7/8 from the dashboard to prevent it fouling the foot board at maximum engine revs. The pedal comes up with high engine revs. The anchorage bolt of the triangular stay to the frame has become loose on several occasions. 10) Magnesium Gearbox. This has previously run 10.000 Miles on 4. B. IV. We cannot observe any failure of the casting. The box is free from oil leaks. The gears are standard for quietness. The top (direct drive) has come out of mesh on several occasions on the over-run at high speeds. The cause at first was due to the pulling effect of the leather gaiter fitted over the change speed quadrant as part of the scheme to shut out engine noise. We took the gaiter off with no appreciable increase of engine noise. The gear has not since come out so readily. II) MAGNESIUM DASHBOARD AND CLUTCH PIT. We have not observed any faults due to the dashboard and clutch pit being made of magnesium. 12) SHEET STEEL WHEELS ARCHES. There has not been the trouble previously experienced of the wheel arches coming loose. 13) 7% LOWER AXLE RATIO 10/43. The low geared axle did not make the engine over-rev as expected. The maximum revs of the engine was 4,650 with 18" rear road wheels fitted. We have had 19" road wheels sent out, to bring the ratio as near standard as possible. The maximum revs obtained with these wheels has been 4,450. We have not over-reved the engine on down gradients. The axle has been standard for quietness. There is an over-run period from 40 to 30 MPH. 14) REAR AXLE PERFECT OIL SEAL LEATHERS TO OVERCOME LEAKAGE OF OIL THROUGH THE HUB ON TO THE BRAKE SHOES. The axle has not leaked oil down the tubes. The brake mechanism and inside the oil catcher was perfectly dry. ............ | ||