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).
Recommendation to adopt the new Lucas Cut-out as standard based on its reliability and performance.
| Identifier | ExFiles\Box 180\M1\8\ img001 | |
| Date | 7th July 1921 | |
| To H.{Arthur M. Hanbury - Head Complaints} from Hs.{Lord Ernest Hives - Chair} c. to CJ. c. to K.{Mr Kilner} c. to De. c. to BY.{R.W. Bailey - Chief Engineer} c. to EP.{G. Eric Platford - Chief Quality Engineer} Lucas Wor{Arthur Wormald - General Works Manager} + yrd. y4349 ORIGINAL IMPROVED LUCAS CUT-OUT. From what we have seen of the working of the new Lucas Cut-out, we would recommend that we adopt it as standard. From our experience with automatic switches we should estimate that out of a possible 100 marks we should give 90 marks for the reliability of the switch to cut in and cut out, the remaining 10 marks would be divided between the current efficiency of the cut-out, and weight etc. We believe that as regards reliability in cutting-in and cutting-out, the new Lucas cut-out is as good or better than any cut-out we have seen. Referring to the lateness of this switch cutting in when it is warm, actually on the car, it means that the switch will cut in at .8 M.P.H. higher speed than it would if it was to our specification. As soon as ever the switch cuts in, the current jumps to the proper value. We would not treat the loss due to the late cutting-in as being serious. As regards the current consumed to break the contact in the automatic switch, the results show that over a range of about 24 M.P.H., the cut-out will consume from 0 to 2.5 amperes. The cut-out we use at present consumes about 1.0 amperes over a smaller range of speed. We believe that it is agreed that the way to make this new Lucas cut-out more efficient would be to make it larger. This would mean that it could not then be fixed inside the switch box which would mean that we Contd:- | ||