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).
Bonnet tests recording average temperatures of carburettor air intake, oil, water, and dash at various speeds.
| Identifier | ExFiles\Box 101\4\ scan0061 | |
| Date | 31th July 1934 | |
| Steadman X500a 31st July 1934. 21 G IV. BONNET TESTS. Average temperatures of carburettor air intake and top of dash taken every mile during 10 mile run at constant speeds of 60, 40 and 20 M.P.H. with plain and louvered bonnet. Shutters held full open. RESULTS. Conditions of Test. Temperatures °C. Air. Oil. water. Air intake. Dash. 60 M.P.H. plain bonnet flaps closed. 35.5 93 60 53 56 60 M.P.H. plain bonnet flaps open 36.- 91.5 77 51 54 40 M.P.H. plain bonnet flaps closed 36.- 82 74 52 53 40 M.P.H. plain bonnet flaps open 36.- 79 73 51 51 20 M.P.H. plain bonnet flaps closed 36.- 71 72 54 54 20 M.P.H. plain bonnet flaps open 36.- 69 70 51 51 60 M.P.H. Louvered bonnet. 35.- 90 75 48 50 40 M.P.H. Louvered bonnet. 35.- 80 70 48 49 20 M.P.H. Louvered bonnet. 35.- 70 68 48 50 Q.W.H. [Watermark: PERFECTO] | ||