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).
Methodology for radiator performance tests.
| Identifier | ExFiles\Box 78\3\ scan0054 | |
| Date | 25th February 1915 | |
| From Exp. Dept. Copies for: J.{Mr Johnson W.M.} R.{Sir Henry Royce} E.{Mr Elliott - Chief Engineer} Na.{Mr Nadin} Wor{Arthur Wormald - General Works Manager}/EH2/L25215. February 25th. 1915. [Signature: H Royce] RE RADIATOR TESTS. Attached herewith are charts showing the result of radiator tests, the tests we carried out in two different ways. No.1 chart shows the results obtained on the dynamometer, the car was run with bonnet and floorboards on, it was run full power at 750 and 1500 revs, the HP developed was kept constant and the atmosphere temperature was constant. We measured the time taken for the water in the radiator to rise in temperature from 60ºC to 95ºC. The car was first run to get it working at a normal heat, it was then run full throttle at the speed we required, the supply water was turned on until the temperature of the water in the radiator was below 55ºC then the supply water was cut off and when the temperature reached 60ºC a stop watch was started and it was stopped when the temperature reached 95ºC; the time taken with the different radiators is shown on the chart. Before we decided on this method of comparing the radiators we tried by measuring the amount of water required to keep the engine at a certain temperature, this was not so reliable because it introduced another variable, the water | ||