Data table comparing engine crankshaft stiffness, inertia, and critical speeds for various configurations.
| Identifier | ExFiles\Box 85\5\ scan0016 | |
| Date | 6th July 1932 guessed | |
| COLUMN HEADERS: Row 1: PEREGRINE(Experimental Bentley car never produced / Aero Engine), BENSPORT(Codename for 3 1/2-litre Bentley), 3 1/2" STROKE, 3 1/2" STROKE, 3 3/4" STROKE, 3 3/4" STROKE, 3 7/8" STROKE Row 2: E.100043, LEC. 3097, 2 3/8 JOURNALS, 2 1/4 JOURNALS, 2 3/8 JOURNALS, 2 1/4 JOURNALS, 2 1/4 JOURNALS Row 3: 2" PINS, 1 3/4 PINS, 2" PINS, 1 3/4 PINS, 2" PINS DATA ROWS: STIFFNESS LBS-FT/RADIAN: 34500, 43000, 56500, 46500, 54000, 45000, 50000 INERTIA [PEREGRINE(Experimental Bentley car never produced / Aero Engine) = 1 UNIT]: 1.00, 1.05, .91, .81, .99, .90, 1.00 CRITICAL SPEED WITHOUT DAMPER HUB.: 5400, 5900, 7300, 6800, 6700, 6500, 6500 | ||
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).