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).
Two graphs showing main bearing loads versus crank angle for a Kestrel engine.
| Identifier | ExFiles\Box 138\1\ scan0013 | |
| Date | 18th February 1932 guessed | |
| CENTRE MAIN BEARING LOAD 555 HP AT 2500 RPM 500 HP AT 2250 RPM lbs CRANK ANGLE REPEATS FOR 2ND 360° HS{Lord Ernest Hives - Chair} 538 KESTREL SAME INDICATOR DIAGRAM THRO' OUT 0° CRANK ANGLE WHEN PLAIN ROD AT T)C No 3 MAIN BEARING LOAD AT 2250 RPM | ||