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).
Comparison table of radiator performance metrics for various cars, ranked by merit.
| Identifier | WestWitteringFiles\K\October1923\ Scan33 | |
| Date | 5th October 1923 guessed | |
| COMPARISON 1000 LITRE DISPLACEMENT PER MILE ON DIRECT DRIVE BASIS. [TABLE 1] Header 1: Car. Order of merit. Header 2: Area of matrix face per 1000 ltr. displ: per mile. ins. Data: Fiat. | 110.0 Panard. | 100.33 Delage. | 98.6 Bentley. | 95.3 R-R 20 HP (red) | 90.8 Hispano. | 88.6 Farman. | 86.0 Isotta. | 78.3 Napier. | 78.1 Voisin. | 74.5 Minerva. | 65.25 New R-R Rad. (red) | 60.6 (red) R-R 40/50 (red) | 57.6 Packard. | 51.4 [TABLE 2] Header 1: Car. Order of merit. Header 2: Wtr. cap. galls. per 1000 ltr. displ: per mile. galls. Data: Minerva. | 1.2 Hispano. | 1.149 Bentley. | 1.145 Delage. | 1.09 R-R 20 HP (red) | .95 R-R 40/50 (red) | .888 Voisin. | .803 Fiat. | .772 [TABLE 3] Header 1: Car. Order of merit. Header 2: Surface of core per 1000 ltrs: displ: per mile. sq.ft. Data: Panard. | 31.05 Isotta. | 26.9 Hispano. | 25.62 Farman. | 24.9 Fiat. | 23.9 R-R 20 HP (red) | 22.8 Bentley. | 20.65 Delage. | 20.4 Minerva. | 20.25 Napier. | 19.9 New R-R Rad (red) | 18.8 R-R 40/50 (red) | 17.62 Voisin. | 16.18 Packard. | 15.0 [TABLE 4] Header 1: Car. Order of merit. Header 2: Surface of core per inch of depth per 1000 ltr. displ: per mile sq.ft. Data: Fiat. | 7.93 Panard. | 7.79 Hispano. | 6.4 Bentley. | 6.89 Delage. | 6.28 Farman. | 6.2 R-R 20 HP (red) | 5.77 Isotta. | 5.67 Voisin. | 5.3 Napier. | 4.97 Minerva. | 4.16 Packard. | 3.87 New R-R Rad. (red) | 3.85 (red) R-R 40/50 (red) | 3.68 | ||