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 a Brooklands test comparing critical air temperature under various car configurations at high speed.
| Identifier | ExFiles\Box 155\1\ scan0259 | |
| Date | 8th September 1936 | |
| RESULTS OF FURTHER BROOKLANDS TEST (SEPT. 8th 1936). All tests with bonnet shutters open. Condition of test (all full speed approx. 88 MPH) | Critical air temperature. --- | --- Car as standard (but no radiator shutters) | 23.5 Car as standard except that spot light in front of radiator was removed (but no radiator shutters) | 25.5 Car as standard except that (1) spot light (2) head lamps and (3) horns were removed (but no radiator shutters). | 23.5 Car as standard except that (1) spot light (2) head lamps (3) horns (4) bumper bar and number plate and (5) front suspension shield, were removed. (but no radiator shutters.) | 25.5 Car as standard, but with bonnet shutters closed (but no radiator shutters). | 21.5 | ||