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).
Summary of oil cooler failure data, analysing car months run against failures for different cooler types.
| Identifier | ExFiles\Box 131\5\ scan0072 | |
| Date | 29th April 1938 guessed | |
| SUMMARY OF OIL COOLER FAILURE DATA. SHEET (1) | SERIES. | No. car months run on 1st. type cooler. | No. car months run on 2nd. type cooler. | No. car months run on 3rd. type cooler. | No. of failures of 1st. type. | No. of failures of 2nd. type. | |---|---|---|---|---|---| | AZ | 1569.5 | 122.0 | 222.5 | 13 | 0 | | AX | 1162.0 | 105.0 | 109.5 | 8 | 0 | | BU | 912.5 | 81.5 | 175.0 | 10 | 0 | | BT{Capt. J. S. Burt - Engineer} | 769.0 | 31.0 | 138.5 | 5 | 1 | | GP | 0.0 | 633.5 | 26.5 | 0 | 4 | | CM | 0.0 | 311.5 | 16.5 | 0 | 1 | | Totals | 4413.0 | 1284.5 | 686.5 | 36 | 6 | No. of car months run/cooler failure. (1) 1st. type 4413 car months. 36 failures } 122.7 car months/failure. - 10.2 car years / failure. (2) 2nd. type 1285 car months. 6 failures } 214.0 car months/failure. - 17.9 car years / failure. (3) 3rd. type 687 car months No failures } - ***************** Periods of service after which coolers have failed. (1) 1st. type - 1 month to 17 months - no consistency. (2) 2nd. type - 2 month to 6 months - av. about 5 - 6 months. | ||