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 tests comparing a standard radiator with a German radiator on chassis 1701.
| Identifier | ExFiles\Box 78\3\ scan0152 | |
| Date | 1st August 1911 | |
| R.R. 148 (20 H) (W 414. 13.4.11) G 1616. X767 1500 Radiator tests Standard Radiator One trans as (see other card.) compared with a German rad. on chassis 1701 special bonnet etc. Remarks ( test body only on air. | Floorboards | Water | Remarks 31°C | 40° | 90 | ordinary running sun 29°C | 39°C 100°(just) | 100 boil. | { very hot - on to floorboards 28°C | 38°C | boil | { a little hard pull { up long hill up both Tiddle & Buxton Cohen 29/7/11 17 1/2 | 20 | 75-80 | in morning 31/7/11 18 1/2 | 22. | 87 | ordinary running 21 1/2 | 27 1/2 | 81 | { long hard pull 3rd gear 20°C | 25 | 90. | { engine stopped & car standing for short time long hard pull 20-25 mph. Summary no diff. in radiators Cohen C.B. 29/7/11 & 30/7/11 see record of Simms radiator CP. 1/8/11 | ||