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 chart comparing various metrics for F.11 and F.12 production engines from August to October 1927.
| Identifier | ExFiles\Box 36\2\ scan 139 | |
| Date | 21th November 1927 | |
| PERFORMANCE OF R-R F.11 & F.12 ENGINES (PRODUCTION ENGINES Aug-Oct: 1927) SHEET ② LOW COMPRESSION — 6/1 FULL THROTTLE B.H.P. AT O... 2000 RPM X... 2250 RPM ☐... 2500 RPM FUEL CONS: (FULL THROTTLE) 80/20 BENZOL/AVIATION 2000 RPM 2250RPM 2500 RPM O X ☐ OIL CONS: PINTS/HOUR AT 2250 RPM 430 BHP OIL TEMP: RISE °C AT 2250 RPM 430 BHP WATER TEMP RISE °C AT 2250 RPM 430 BHP AIR TEMP °C AVERAGES DURING TESTS AT 2250 RPM 430 BHP WEIGHTS (DRY) PREVIOUS TO DESPATCH ENGINE NUMBER F.12-1 F.12-3 F.12-5 F.12-7 F.12-9 F.12-11 F.12-13 F.12-15 F.12-17 F.12-19 Scales (from left to right): BHP: 400, 450, 500, 550 Fuel Cons: .45, .5, .55, .6 Oil Cons: 0, 5, 10, 15, 20 Oil Temp Rise: 5, 10, 15, 20, 25 Water Temp Rise: 0, 5, 10, 15, 20 Air Temp: 5, 10, 15, 20, 25 Weights: 800, 815, 830 Handwritten note: v/c 21/11/27 | ||