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 specifications and testing of a Scintilla windscreen wiper.
| Identifier | ExFiles\Box 167\5\ img040 | |
| Date | 14th May 1932 | |
| X6115. 14. 5. 32. SCINTILLA WINDSCREEN WIPER. The length of the motor including driving spindle is 5 inches, and the diameter 2.6 inches. The weight of the motor without wiping gear is 1 lb. 6 1/2 ozs. There is no means of varying the pressure on the wiper arm which is applied by a spring bearing of the arm. The sweep angle is approximately 110 degrees, and the sweep radius is 13 inches. Whilst running of the bench the motor was rather noisy, this appeared to be due to the brushes, although the noise was by no means excessive, when the motor is mounted on a windscreen inside a closed car it is probable that the noise will be rather more than is usual. Connection to the motor is made by two terminals mounted on a terminal block, on the top of the motor casing. When running with a load equivalent to the weight of the wiper-gear the motor takes 1.800 amperes at 12.00. volts. With a load of 2 ozs the current taken is 1.95 amps at 11.70 volts, with 4 oz load the current is 2.050 amps at 11.695 volts, with a load of 3 ozs the current is 2.30 amps at 11.65 volts, when the motor is stalled the current is 2.70 amps at 12 volts. After running for 5 minutes with a load of 3 ozs the motor warmed up considerably. Whilst in operation the drive was quite smooth under no load, but with a load of 3 ozs the motor became jerky at the end of the stroke. Hs{Lord Ernest Hives - Chair}/Vst. | ||