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).
Radiator test results, comparing the efficiency of Orme Evans and Marston models and suggesting improved testing procedures.
| Identifier | ExFiles\Box 78\3\ scan0062 | |
| Date | 4th March 1915 | |
| C O P Y. 5/3/15 To Wor.{Arthur Wormald - General Works Manager} for EH. from R.{Sir Henry Royce} Copy to J.{Mr Johnson W.M.} " " E.{Mr Elliott - Chief Engineer} " " Na.{Mr Nadin} R4/IB4315. March 4th. 1915. Re Radiator Tests. Wor{Arthur Wormald - General Works Manager}/EH2/L25215 With reference to the testing of the radiators, I have read with great interest the result of the experiments with radiator cooling, but there is just one point in which I think your system of testing has fallen short. That is, when comparing the 5" Orme Evans radiator with the 4" Marston, you have about 10 lbs more weight of water and 30 lbs weight of metal to heat up, and this extra weight of metal in the Orme Evans should show that the Marston round tube radiator is more efficient than the other types, and from my point of view the 4" radiator is nearly as efficient as the 5". As there is such a considerable saving of weight between the heavy Orme Evans 5" radiator and the lighter constructed 4" one of Marstons make, which latter saves something like 40 lbs in all, we ought to be certain to give the lighter radiator full chance. My own impression of the way to test these radiators is that you should run theengine all out, at some various well known speeds, particularly such as 1500, and supply a small additional quantity of water | ||