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).
Test report on overheating in the interior of Phantom cars, detailing temperature changes with different silencer lagging configurations.
| Identifier | WestWitteringFiles\P\2July1926-September1926\ Scan037 | |
| Date | 9th August 1926 | |
| To R.{Sir Henry Royce} from Hs{Lord Ernest Hives - Chair}/AJL. c. to BJ. WOR.{Arthur Wormald - General Works Manager} c. to E.{Mr Elliott - Chief Engineer} DA.{Bernard Day - Chassis Design} c. to BY.{R.W. Bailey - Chief Engineer} ORIGINAL Hs{Lord Ernest Hives - Chair}/AJL/T9.8.26. X8830 X.819 OVERHEATING IN THE INTERIOR OF PHANTOM CARS. We have carried out tests on the above. The tests were carried out on a standard Phantom chassis fitted with a Barker Limousine body. When sitting in the rear of the car it is possible to ascertain how much of the silencer is lagged by feeling with the hands the floorboard temperature, the floorboards above the lagged portion being cool compared with those immediately above the unlagged portion of the silencer. From this it can be concluded that the great majority of heat is purely radiation from the hot silencer. The temperature of the floorboards was noted under varying conditions. Below are the results :- | | Standard. | Completely lagged silencer. | Floorboards lagged with asbestos standard silencer. | |---|---|---|---| | Air temp. | 19°C. | 31°C. | 24°C. | | Floor temp. | 61°C. | 51°C. | 38°C. | Water temp. 80°C. in all tests. Load conditions the same. It is not recommended that the silencer be completely lagged; we have been working recently to decrease exhaust noises without increasing lagging, and it is not desirable to wrap up the silencer any more than Contd. | ||