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).
Technical memo discussing the design and pressing of louvres directly into the bonnet sheet.
| Identifier | ExFiles\Box 102\6\ scan0032 | |
| Date | 29th September 1925 | |
| To DA.{Bernard Day - Chassis Design} from R.{Sir Henry Royce} c. to CJ. BJ. c. to Hs.{Lord Ernest Hives - Chair} BY.{R.W. Bailey - Chief Engineer} Y5260 R7/M29.9.25. LOUVRES. X. 8260 X. 5260 If we use louvres on the bonnet we must make them from the bonnet itself, without undue labour. To do this you must press them in as well as press them out. They must be curved and shaped so as to be stiff, and difficult to see through. If necessary we could add a small amount of inside lip, cheaper than we could add it to the outside lip, for a given degree of efficiency. R.{Sir Henry Royce} [Handwritten diagram annotations]: ADD TO THIS IF NECESSARY INSIDE OUTSIDE LINE OF BONNET SHEET SAY 30° VERY FINE PITCH SAY TWO THIRDS OF LATEST MODEL SENT TO W W | ||