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).
Results of radiator tests using 'Method A' to compare different matrix sizes and configurations.
| Identifier | ExFiles\Box 24\4\ Scan285 | |
| Date | 21th November 1924 guessed | |
| RADIATOR TESTS - METHOD 'A'. The following values are the values of 'A' where 'A' is the drop in temperature of the system, per min, per Fº difference in temperature between the mean radiator temp. and the air. The water equivalent of the 23¾" matrix system was estimated as being 111.5 lbs. of water, the std. 20¼" matrix system as 105 lbs. All the values of 'A' in the table are for a water equivalent of 105 lbs., that is the value obtained graphically by 111.5 / 105 or 1.065 to enable direct comparison between the two radiators to be made :- VALUES OF 'A'. 20¼" 23¾" Standard matrix. Large matrix. 20 m.p.h. 30 m.p.h. 20 m.p.h. 30.m.p.h. Standard .112 .160 .122 .1762 No Fan. .0795 .112 .084 .121 Shutters. .1205 .115 .131 .188 Louvres. .1205 .180 + + These readings suspected Top panel. .1835 of inaccuracy. Side panel. .1885 % Alteration in cooling system due to accessories from above figures. 30 M.P.H. Condition of Car. Increase or decrease in Radiator efficy: 20¼ Matrix. 23¾ matrix. Removing Fan. Decrease 29.9% Decrease 31.6% Opening shutters. Increase 7.2% Increase 6.8% Opening louvres. " 12.5% (struck through) " 14.6% (struck through) Removing top panel " 14.7% Removing side panel " 18.8% | ||