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).
Hand-drawn comparison of crankshaft oil system drilling methods for Allison and Kestrel engines.
| Identifier | ExFiles\Box 173\2\ img037 | |
| Date | 6th July 1931 | |
| ALLISON CRANKSHAFT CONTINUOUS OIL SYSTEM DRILL Pin drilling arranged at convenient angle to drill through Pin Bore KESTREL DRILLED ON ANGLE ALTERNATE THROWS MOD KESTREL CONTINUOUS FLOW SOME PLACES WHERE TWO HOLES DRILLED FROM ONE JOURNAL MAKING LARGE HOLE HERE COULD ALLISON Sch BE ADOPTED THINK ANGLE TOO ACUTE BUT COULD BE DRILLED AS SHEWN FOR TEST N.G.S. / 6.7.31 | ||