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).
Table of radiator test results conducted on a Hispano car, with and without the bonnet fitted.
| Identifier | ExFiles\Box 22\1\ Scan197 | |
| Date | 22th September 1924 | |
| RADIATOR TESTS ON HISPANO CAR. | Condition of test. | Eng. r.p.m. | Air passing through radiator. ||| Air passing through core. || Temp. of room. | B.T.U's min. accounted for by Radiator. | |---|---|---|---|---|---|---|---|---| | | | lbs.min. | Top temp. | Bottom temp. | Temp. behind Fan. | Temp. in front Radiator. | | | | WITH BONNET. | 500 | 47.6 | 89.75 | 83.5 | 67.75 | 18.5 | 15.5 | 535 | | | 1000 | 82.3 | 91.25 | 85.25 | 59 | 18.1 | 16.1 | 890 | | | 1490 | 127.5 | 91.5 | 86.75 | 56.25 | 19 | 17 | 1090 | | | 2025 | 159 | 89.75 | 85.5 | 55 | 18.5 | 17 | 1216 | | BONNET REMOVED. | 500 | 46.6 | 90.5 | 81.25 | 41 | 20 | 15 | 776 | | | 1000 | 86.2 | 89.0 | 82.1 | 39.25 | 18 | 16 | 1070 | | | 1500 | 127.6 | 90.25 | 84 | 38.5 | 18.75 | 17 | 1435 | | | 2000 | 164.5 | 91 | 85.25 | 38.5 | 20 | 18.5 | 1705 | | ||