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).
Performance graph for the Spectre No. 1 unit engine, plotting BHP and MEP against RPM.
| Identifier | ExFiles\Box 4\1\ 01-page101 | |
| Date | 24th April 1940 | |
| SPECTRECodename for Phantom III - No1 UNIT SP{Mr Spinney}1 COMPRESSION RATIO 5.95:1 (SHORT BENDS ATTACHED TO MANIFOLDS) NO AIR SILENCER NORMAL TIMING ID 4° PTDC Ic 52° PBDC Eo 45° BBDC Ec 5° PTDC TIMING TOOTH EARLY Io 8.8° BTDC Ic 40° PBDC Eo 50° BBDC Ec 8.8° BTDC SPARK PLUGS Ex KLG 808 IL LODGE 388 WITH .020 CLCE TIMING AS CHECKED AT BHP MEP lbs/D" RPM W.W.S 24.4.40 | ||