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).
Graph showing Cyclone engine performance trends over a 10-year period from 1925 to 1935.
| Identifier | ExFiles\Box 150\1\ scan0219 | |
| Date | 30th January 1936 guessed | |
| CYCLONE ENGINE TRENDS OVER A 10 YEAR PERIOD FIG. 1. YEAR 1925 1927 1929 1931 1933 1935 RATED CRANKSHAFT SPEED - R.P.M. 1600 1700 1800 1900 2000 2100 PISTON DISPL. CU. IN. 1600 1700 1800 COMPRESSION RATIO. 5.0 5.5 6.0 6.5 RATED BMEP @ SEA LEVEL - LBS/SQ.IN. 120 140 160 180 | ||