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).
Design modifications for radiators with integral shutters, including a table comparing the front radiator area of various car models.
| Identifier | ExFiles\Box 15\1\ Scan016 | |
| Date | 25th January 1927 | |
| (To BG. Hs.{Lord Ernest Hives - Chair} From DA.{Bernard Day - Chassis Design}) X7250 DA{Bernard Day - Chassis Design}1/M25.1.27. ROLLS-ROYCE LIMITED. EAC. 8. RADIATOR WITH INTEGRAL SHUTTERS ETC. X.7250 X.8250 X.766 As regards the thickness of the radiator when fitted with integral shutters, we suggest that the space occupied by the shutters themselves might be reduced about .200" and on N.sch.2346 we have shewn the shutters themselves reduced in width about .100", one additional shutter added per side to make up the space, and by rivetting separate levers to the centre shutters, and passing the operating rods through the matrix instead of through the top tank, so that the ends of the connecting rods can come outside the tank wall when in the fully open position, the space occupied by the shutters can be reduced .200". On this drg. and also on N.sch.2350 we have shewn R's proposal to reduce the height of the middle of the tank .400", N.sch.2350 being made to shew that in spite of this the radiator still looks like a Rolls-Royce, and the lightening effect may be considered an improvement. The radiator is also raised in height .500" as R.{Sir Henry Royce} suggests, and we have shewn the tubes 4.500 long, so reducing the total overall width to 5.750 compared with present standard 5.5., first EAC. 8. 6.25., and R's car still more. The modifications to the radiator proportions which are shewn on these drgs. have been discussed with Sales, who have agreed to them from the point of view of appearance. We believe in fact they had themselves made suggestions for almost identical modifications. With reference to the radiator efficiency the following indicates how the front area continuously increased recently :- CAR. | Front area. | Increase compared with pre -N.series. | Increase compared with V.series. ---|---|---|--- Silver Ghost, pre N.series. | 486 | --- | --- Silver Ghost, U. series. | 510 | 4.94% | --- Phantom V.series. | 510 | 4.94% | --- Phantom W. series. | 534 | 9.88% | 4.7% EAC. 8, original. | 565 | 16.25% | 10.8% EAC. 8, as now proposed (N.schemes 2346 & 2350) | 588 | 21% | 15.3% contd :- | ||