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).
Competitor engine cooling technologies and aircraft performance.
| Identifier | ExFiles\Box 173\1\ img079 | |
| Date | 15th January 1934 guessed | |
| - 3 - Hs.{Lord Ernest Hives - Chair} Cooling: They are very pleased with the progress they have recently made with cowling and baffles. They require 4" H2O across cylinders to get cooling and have several methods of obtaining this even on climb. They have a number of further developments coming along including short fan blades on the spinner to help cool the small diameter double row radials. They do not see any immediate limitations in development on this side of the job. Summary: The air cooled is ahead of the water cooled at present. Curtiss Wrights are puzzled to know why we do not take a serious interest in the radial air cooled engine. The latest Douglas Commercial machine fitted with Cyclones (2) carriers 3 crew, 12 passengers, 1000 lbs. freight, top speed 218 M.P.H. cruises 190 M.P.H., climbs to 1200 ft. full load on 1 engine, lands at a very conservative speed. Miscellaneous: Wrights are running a 2 stroke supercharged giving 130 B.M.E.P. at 1800 R.P.M. Still very experimental and on the secret list. They have increased their expenditure on development engineering from 60,000 to 100,000 dollars a month. They are selling about 900 engines a year. Their cylinder head is a particularly fine casting, fins 1" deep 4 per 1". They are hoping to go to 1 1/2 deep, 5 per 1". Rm{William Robotham - Chief Engineer}:S | ||