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).
Summary of radiator tests comparing critical atmospheric temperatures with and without bonnet ventilation at various speeds and conditions.
Identifier | ExFiles\Box 16\2\ Scan027 | |
Date | 1st January 1931 | |
SUMMARY OF RADIATOR TESTS. 25-EX. 4.9/1 C/R.{Sir Henry Royce} 1931. NO BONNET VENTILATION. Level road. | Critical ats. temp. Cº | Small tube rad. .312 across flats. | Large tube rad. .360 across flats. 60 M.P.H. | 42º C. | 40.5º C. 70 M.P.H. | 39.5º C. | 35.0º C. BONNET VENTILATION 3 SHUTTERS/SIDE. Level road. | Critical ats. temp. Cº | Small tubes. | Large tubes. 60 M.P.H. | 46º C. | 44º C. 70 M.P.H. | 42º C. | 38.5º C. BONNET VENTILATION 3 SHUTTERS/SIDE. Hill climbing. | Critical temperature. Large tube radiator. | 26º C. Small " " | 30º C. | ||