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).
Investigation report on a Wraith ignition coil failure on WXA.99.
| Identifier | ExFiles\Box 164\5\ img417 | |
| Date | 1st April 1939 | |
| 6017 To By.{R.W. Bailey - Chief Engineer} from Rm{William Robotham - Chief Engineer}/RC.{R. Childs} c. to Mx.{John H Maddocks - Chief Proving Officer} c. to By/SB.{Mr Bull/Mr Bannister} c. to By/RD. Rm{William Robotham - Chief Engineer}/RC.{R. Childs}5/JH.1.4.39. re Wraith Ignition Coil Failure on WXA.99. An ignition coil to D.75673 was returned from Cricklewood under their report No.N.1733, in which the coil was alleged to be defective. The coil was initially examined by By/RD. and RHC{R. H. Coverley - Production Engineer}/Smd.{J. Smedley} and, we gather, did show signs of weakness on the production test rig, but on being taken out of the case, no defect could be found and in this condition functioned perfectly. The coil was then put back in its case and handed to us for test. We have subjected this coil to all our bench tests also to 400 miles on the road; no signs of weakness can be found. We can only conclude that either the production test rig was in the first case at fault or that a fault was eliminated in removing the coil from its case. In a case such as the above, we would run less risk of loosing valuable evidence of possible causes of breakdown, if the laboratory were allowed to measure electrical constants of the coil before dismantling. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||