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 radiator specifications and performance expectations for various car models.
| Identifier | ExFiles\Box 24\5\ Scan158 | |
| Date | 27th May 1929 guessed | |
| -2- From our results on the Phantom we cannot expect more than 5% to 10% improvement from these two modifications and therefore it would appear that something else will have to be done to deal with the total increase in displacement per ton mile of 31% which we expect. The Chrysler somehow gets away with a radiator of area 423 □ " & Volume 1160. cu. ins The present 20.H.P. radiator for India IV has a face area of 456 □ " and a volume of 1710 cu. ins [Diagram 1] Measurements: 3.38", 21.6" Face Area 410.4 Volume 1620 Cu ins 20.H.P. CAR. 1923 [Diagram 2] Measurements: 2.75", 17.5", 19", 25" Face Area 423 □ " Volume 1160 Cu. ins. CHRYSLER 72 1929 [Diagram 3] Measurements: 3.75", 21.2, 21.6 Face Area 456 □ " Volume 1710 Cu ins. INDIA IV 1929 | ||