On adjustments to the magneto timing for an F.XII No. 7 engine and the resulting changes in RPM.
| Identifier | ExFiles\Box 33\4\ Scan099 | |
| Date | 26th November 1927 guessed | |
| X1770 To HS {Lord Ernest Hives - Chair} Exhaust Mag timing on F.XII No 7 engine altered to 38 1/2° BTDC The drop in RPM now is A side switched off (35°) 2100 Both on B " (38 1/2°) 2120 2250 The old timing 35° BTDC for both mags gave A off 2040 RPM B off 2120 " We are copying a preparing engine for dispatch first thing tomorrow TAG | ||
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).