Table comparing servo torque multiplication data for the 40/50, 20/25, and Peregrine models.
| Identifier | ExFiles\Box 30\6\ Scan132 | |
| Date | 8th November 1933 | |
| X 1589. 210 To Da. {Bernard Day - Chassis Design} from Hs {Lord Ernest Hives - Chair} /Gry. {Shadwell Grylls} Hs {Lord Ernest Hives - Chair} /Gry. {Shadwell Grylls} 8/KT. 8.11.33. SERVO TORQUE MULTIPLICATION. 40/50 3.9 μ = .31 Cams 35º 20/25 2.3 μ = .31 Cams 45º Peregrine(Experimental Bentley car never produced / Aero Engine). 2.0 μ = .31 Cams 45º Hs {Lord Ernest Hives - Chair} /Gry. {Shadwell Grylls} | ||
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).