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).
Photograph showing the condition of Kestrel engine main bearings after a development test.
| Identifier | ExFiles\Box 115\2\ scan0386 | |
| Date | 24th April 1937 | |
| KESTREL 4329 - CONDITION OF MAIN BEARINGS F.43615-20 IN R.R. (ALLISON) LEAD BRONZE AFTER 100 HR. DEVELOPMENT AT EAGLE 26 POWERS AND SPEEDS, WITH HARDENED UNBALANCED CRANKSHAFT. RUNNING TIME (18.3.37 to 24.4.37) 117 3/4 HRS. ← 1 to 7 → KF.10 | ||