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).
Design and manufacturing process for bonnet louvres, including a hand-drawn diagram.
| Identifier | ExFiles\Box 66\3\ scan0107 | |
| 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} Handwritten: X8260 R7/M29.9.25. LOUVRES. X. 8260 X. 8260 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 notes on diagram] LINE OF BONNET SHEET INSIDE OUTSIDE ADD TO THIS IF NECESSARY SAY 30° VERY FINE PITCH SAY TWO THIRDS OF LATEST MODEL SENT TO W W [Watermark] CONDOR 1804 | ||