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).
Test report on the dynamo and regulator for car 35.EX.
| Identifier | ExFiles\Box 168a\3\ img105 | |
| Date | 11th July 1938 | |
| To By c. to By/RD. 6142 Rm{William Robotham - Chief Engineer}/HC.1/JH.11.7.38. DYNAMO & REGULATOR TEST ON 35.EX. A test has been carried out on the 72 segment armature dynamo I.C.2 in conjunction with a 2 1/2 turn C.A.V. type regulator on car 35.EX. The main object of the test was to ascertain the behaviour of the new dynamo, under conditions of combined high speed and load. At the same time the run served as an opportunity of checking the performance of the regulator. A similar test was carried out with a standard machine and a 2 1/2 turn regulator, but this ended as was expected, with the solder being melted on the commutator end connections. Before running commenced the condition of the commutator surface was noted. This was of a light brown colour, and well polished. The battery was in a high state of charge, this was necessary in order to make it most difficult for the regulator to prevent the battery from assisting when on load. Also it was required to see what the charging rate and, therefore the extent of overcharging would be, with just the ignition and petrol pump load. Running was then commenced and the following observations made. Test(1) With the car stationary and in a just warm condition, the current going into the battery, with only the ignition and petrol pumps on, was found to be 10 amperes. Test(2) For running on the road the load was increased to 20 amperes. With this load the car ran at high speeds for 3 1/2 hours covering a distance of 141 miles. At speeds of over 30 miles an hour, the dynamo was found to charge the battery at about 1 ampere, rising to 3 amperes as the regulator warmed up. At 31.5 m.p.h. with the overdrive, or about 27.5 m.p.h. without it, the load was just balanced. At about 22 m.p.h. the battery was contributing to the extent of 10 amperes. | ||