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).
The 20 HP radiator and shutters.
| Identifier | ExFiles\Box 182\M20\M20.2\ img010 | |
| Date | 4th April 1924 | |
| R.R. 403A (40 H) (SL 42 12-7-23). J.H., D.{John DeLooze - Company Secretary} EXPERIMENTAL REPORT. Expl. No. 4240 REF: Hs{Lord Ernest Hives - Chair}3/LG4.4.24. To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair} c. to CJ. RO.{C. C. Rose - Export Manager} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} RF. c. to Wor.{Arthur Wormald - General Works Manager} 20 HP. RADIATOR AND SHUTTERS. More material is about to be ordered for a further series of 20 HP. chassis. We have an opportunity therefore of bringing in the radiators with the shutters incorporated with the radiator. We have run one of these radiators 11,250 miles on 6-G-11. There is another one fitted to 5-G-11 which has run about 3,000 miles. - These have been running with the shutters operated by a Thermostat. Except for the failures of the first thermostat which was built up at Derby, we have had no further trouble. To have the shutters operated by a thermostat, is undoubtedly, a refinement. The hand operation however is likely to prove the most reliable. The frontal-area of the new radiator is the same as the present one. The depth of the tubes has been decreased from 4" to 3.5". The amount of water carried in the engine and radiator is approximately the same with both types of radiator. We have carried out tests both on the road and on Brooklands and we find that the new radiator is slightly less efficient than the present one. It has taken a number of tests to show up the difference - we should estimate that it is about 5% less efficient. contd:- | ||