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 of spare wheel arrangements and electrical equipment including a wiper, dynamo, and starter motor.
| Identifier | ExFiles\Box 5a\3\ 03-page181 | |
| Date | 14th December 1931 guessed | |
| {15} We have had the two arrangements fitted for holding the side spare wheel but neither appear to be satisfactory. The stay from the dash to the horn has become loose where attached to the dash. This stay has apparently elongated the holes as a movement of approx. .125" takes place. The amount of movement of the spare wheel has not been of great amplitude and its movement would not be complained of. With the internal stays only, the movement of the wheel was too much and not considered satisfactory. ELECTRICAL EQUIPMENT. LUCAS WINDSCREEN WIPER. This is of a new design and should be considered experimentally only. It has worked very quietly. The failure reported was due to the fixing of the wiper blades not being satisfactory and is the only weak job of the wiper. We have sent a report and sketches, for them to be forwarded to Lucas'. DYNAMO. With our usual practice of taking a total discharge of 6 hours during each 500 miles, the dynamo failed to keep the battery charged. We were using 60 watt. headlamp bulbs as the 36 watt are not suitable for continental driving. This makes a total discharge of 12 amps. By using the lamps on discharge only for actual time of darkness, approx. 3.5 hours, the battery retained its charge. The output of the dynamo has been as follows :- All lights on. Max. discharge 13 amps. Cut in 15 M.P.H. 20 M.P.H. 3.5 amps discharge 30 M.P.H. 2.5 " " 40 M.P.H. 1.5 " " 50 M.P.H. 4.5 " " 60 M.P.H. 4.5 " " 70 M.P.H. 5.0 " " No lights, coil working only Cut in 19 M.P.H. 20 M.P.H. 0 30 M.P.H. 6.5 amps charge 40 M.P.H. 8.0 " " 50 M.P.H. 8.5 " " 60 M.P.H. 8.5 " " 70 M.P.H. 8.5 " " STARTER MOTOR. This has given no trouble at all, there has not been any definite slipping. We had the maximum amount of thickness of cork washers fitted before starting the test and the results | ||