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 and shutter design, focusing on tube size and shutter placement for cars and aircraft.
| Identifier | ExFiles\Box 38\2\ Scan021 | |
| Date | 26th April 1917 | |
| Extract from El/G30119. X.3456. X.3499. X.3719 (3) RADIATORS AND RADIATOR SHUTTERS It was stated by Mr. Olley that a radiator blind or shutter must be on the outside of the radiator for a car used in the U.S.A. to protect it from the extreme climatic conditions which prevailed in Winter; also that with the hand adjusted devices more boiling took place in the Winter than the Summer, due to the tendency of the drivers to open up the device insufficiently. Regarding the size of the radiator matrix tubes, Lieut. Col. Barrington pointed out that the higher the speed of the radiator through the air, the larger were the tubes required, and that the 10 mm. standard adopted by the Air Board, was the size found most suitable for 70 m.p.h. corresponding to the general climbing speed of aeroplanes. Mr. Day gave the figure of 7 mm. which has been found most suitable for airship radiators at 50 m.p.h. X.3456 & X.3499 Mr. Royce decided that an 8 mm. tube would probably be the best choice for car work, as a suitable compromise, and in view of the fact that a freer flow of air was required under the footboards, it should give equal, or greater water cooling and cooler floorboards. Instructions were issued to order experimental radiators with 8 mm. tubes, with a view to standardising this size. | ||