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).
Cooling tests comparing air pressure under a bonnet fitted with flip-flap shutters versus a louvred bonnet.
| Identifier | ExFiles\Box 16\2\ Scan039 | |
| Date | 19th September 1931 | |
| To R.{Sir Henry Royce} From He/Lid.{A. J. Lidsey} c. to Sg.{Arthur F. Sidgreaves - MD} Wor.{Arthur Wormald - General Works Manager} c. to H.{Arthur M. Hanbury - Head Complaints} Da.{Bernard Day - Chassis Design} c. to By.{R.W. Bailey - Chief Engineer} [illegible signature] 50. Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey}1/WJ.19.9.31. P.2 COOLING TESTS. x766 x7=60 Further to Hs{Lord Ernest Hives - Chair}/Lid.{A. J. Lidsey}1/AD.17.9.31. we have recorded the air pressure existing under the bonnet fitted with flip-flap shutters. The results obtained show a decrease in pressure of approximately 25% resulting from opening the shutters, this compares with 40% obtained by using a louvred bonnet. The difference in pressure are approximately proportionate to the difference in engine water temperature when running under these conditions. Hs{Lord Ernest Hives - Chair}/A.J.Lidsey. Print attached. | ||