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).
Use of bonnet shutters versus louvres for engine cooling.
| Identifier | ExFiles\Box 179\1\ img001 | |
| Date | 1st October 1931 | |
| HS.{Lord Ernest Hives - Chair} FROM R.{Sir Henry Royce} C. to SG.{Arthur F. Sidgreaves - MD} WOR.{Arthur Wormald - General Works Manager} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} to BY.{R.W. Bailey - Chief Engineer} DA.{Bernard Day - Chassis Design} E.{Mr Elliott - Chief Engineer} ORIGINAL COOLING OF CARS From the high pressure of air under the bonnet it is evident that we must work at increasing the means of getting the air away. Three shutters are not enough and I have suggested trying at least 5, but we cannot expect more than an additional 10% to 15% increase on the 50% value of 3 shutters over a louvred bonnet - i.e. 5 shutters = 60% to 65% of louvres. We must therefore for maximum cooling still use louvres, and since they are bad for permitting engine noises to pass, and one can see the naturally somewhat dirty engine through them, I think we should continue to try if we can get good results and better appearance from the horizontal ones. [Signature: AHR] R.{Sir Henry Royce} Hermetic Rubber. | ||