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).
Temperature tests on four experimental layouts for the main battery cable.
| Identifier | ExFiles\Box 164\2\ img042 | |
| Date | 14th May 1940 | |
| 6021 Elec To EV.{Ivan Evernden - coachwork} from Rm{William Robotham - Chief Engineer}/RC.{R. Childs} Rm{William Robotham - Chief Engineer}/RC.{R. Childs}2/JMc.14.5.40. MAIN BATTERY CABLE LAYOUT. In order to make certain that we use the best possible arrangement for the layout of the main battery lead, we have taken temperature tests on the four experimental schemes now in existance. (See sketch) The important points to watch are:- (1) That the cable is not overheated. This is one of our main difficulties since the cable must cross the exhaust system whichever layout is used. (2) That the cable is shielded as much as possible, from salient objects on the ground. We recently had a case of a cable being crushed, at a point on the underside of the centre portion of the cruciform. It is possible that this was done on a gate stop, as, on accelerating after opening the gates, the back of the car would tend to dip and in an extreme case the rear end of the frame would hit the gate stop. (3) That the cable should be kept as short as possible. Temperature tests, by means of Thermo-couples, have been taken to ascertain the maximum temperature attained by the cable. The results were as follows:- (i) 30G V11 50°C. (ii) 1.R.1. 78°C. (iii) 9 B.V. 83°C. (iv) 33G V11. 130°C. Thus, from a heat consideration point of view, the scheme on 30 G.{Mr Griffiths - Chief Accountant / Mr Gnapp} V11 is the best, and that on 33G V11 is subjected to too high a temperature. The schemes on 1.R.1. and 9 B.V. are quite safe in this respect. | ||