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).
Experimental order of radiator tubes for the 40/50 HP and 20/25 HP models.
| Identifier | ExFiles\Box 149a\3\ scan0087 | |
| Date | 27th May 1931 | |
| BY/CS. c. to Hs.{Lord Ernest Hives - Chair} X4607 BY8/G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 27. 5. 31. X7250 x5250 x4607. 40/50 HP. and 20/25 HP. RADIATORS. As an experimental issue only, in order to enable us to decide which of the American tubes is the better one for our purpose, we should order up :- a/- 40/50 HP. 3 sets of 40/50 HP., 8 m/m.{Mr Moon / Mr Moore} on the diameter and 8 1/2 m/m across the flats on the hexagon ends, b/- 20/25 HP. 3 sets of tubes for the new radiator which we are proposing for the seconfhalf of 'T' series, to the same dimensions of tube for the 40/50 HP. quoted above. These tubes will be made in copper and produced with the same number of indents per length, and produced as spirals, precisely similar to the American tubes which were brought back by Hs.{Lord Ernest Hives - Chair} I wish to confirm that for the seconf half of 'T' series we must use present standard material and tube dimensions, except of course for the length, with the indentations which have been standardised for the first half of 'T' series. We should reduce main dia. of the tube by 1 1/4 m/m to preserve waterway. BY.{R.W. Bailey - Chief Engineer} | ||