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).
Cooling tests for radiator and bonnet shutters, with production notes on the sylphon tube.
| Identifier | ExFiles\Box 39\4\ Scan073 | |
| Date | 20th March 1924 | |
| R.R. 403A (20H) (D.A. 652 20-3-24) J.H.D. 4's EXPERIMENTAL REPORT. Expl. No. REF: 7. Cooling Test down the hill, top gear engaged:- Temp. at top - 87°C. Shutter position - 63°. The shutters closed in 45sec. at a temp. of 75°C. 8. If it were decided to supply bonnet shutters, a test was taken to show the margin of radiator shutter opening this would give:- Starting with Radiator shutters closed Temp. Start. Radiator Shutters Temp. at Top. 71°C 42° 81°C. Bonnet shutters closed. 71°C 30° 80°C " " opened Production Notes. The sylphon tube decided on is known as C NO 2 S & has the following characteristics:- Loaded with efethyl-alcohol. (chemically pure). Commences to operate at 177°F, or 80°C. Fully contracted at 183°F, or 84°C. Stroke .430"; & is capable of lifting a load of 35lbs. shutters & All the controls must work freely; any binding will alter the temperature in either direction. The shutter return spring, E 52139, must be used; the spring used on hand controlled shutters, E 52174, will not do. | ||