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 of various car radiators based on litre displacement.
| Identifier | WestWitteringFiles\K\October1923\ Scan34 | |
| Date | 3rd October 1923 guessed | |
| COMPARISON ON LITRE DISPLACEMENT BASIS TABLE 1: Car. Order of merit. Area of matrix face per litre displ: sq.in. Fiat. - 207 R-R 20 HP. - 131 Panard. - 111 Bentley. - 111 Delage. - 98.7 Isotta. - 92.0 Hispano. - 88.6 Farman. - 88.6 Voisin. - 83.5 Napier. - 79.5 New R-R Rad. - 68.7 Minerva. - 67.6 R-R 40/50 - 67.6 Packard. - 64.6 TABLE 2: Car. Order of merit. Water capacity per litre displ: galls. Fiat. - 1.468 Bentley. - 1.337 R-R 20 HP. - 1.336 Minerva. - 1.237 Delage. - 1.09 R-R 40/50 - 1.05 Napier. - .92 Voisin. - .9 TABLE 3: Car. Order of merit. Surface of core per litre displ: sq.ft. Fiat. - 44.9 Panard. - 33.2 R-R 20 HP. - 33.0 Isotta. - 32.0 Hispano. - 25.6 Farman. - 24.25 Bentley. - 24.0 Minerva. - 22.6 New R-R Rad. - 21.0 Napier. - 20.5 Delage. - 20.3 Packard. - 20.15 R-R 40/50 - 19.98 Voisin. - 18.1 TABLE 4: Car. Order of merit. Surface of core per litre displ: per inch of depth. sq.ft. Fiat. - 14.9 R-R 20 HP. - 8.35 Panard. - 8.3 Bentley. - 8.0 Isotta. - 6.74 Farman. - 6.6 Hispano. - 6.4 Delage. - 6.25 Voisin. - 6.03 Packard. - 5.21 Napier. - 5.1 Minerva. - 4.64 New R-R Rad. - 4.37 R-R 40/50 - 4.15 Total core surface per cu.ft. of vol. taken as :- AIR TUBE 110 Sq Ft ZIG ZAG DIAGONAL 125 Sq Ft STRIP FINS 110 Sq Ft CONTINUOUS FINS AND TUBE 130 Sq Ft | ||