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).
Table comparing the weight and inertia values for various Bentley flywheels.
| Identifier | ExFiles\Box 85\2\ scan0146 | |
| Date | 29th January 1935 | |
| L212 29.1.35. BENTLEY FLYWHEELS. Weight Inertia Standard 20/25 97 lbs. .69 Standard Bentley 74 lbs. .46 N.Sch.3948. 81 lbs. .46 N.Sch.3948. mod. to Hs.{Lord Ernest Hives - Chair}1416. 73 lbs. .39 N.Sch.4190 63 lbs. .33 Disc + 11" B. & B. 52 lbs. .31 Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||