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).
Calculation on the effect on critical speed of using Duralumin connecting rods in a Bentley engine.
| Identifier | ExFiles\Box 85\3\ scan0055 | |
| Date | 23th September 1933 | |
| X214. 23.9.33. EFFECT ON CRITICAL SPEED OF DURALUMIN CONNECTING RODS IN THE BENTLEY. The weight of 6 big ends is 7.7 lbs. and thus approximate inertia 47.5 lbs. in2. If these were made in Dural to the same drawings providing a saving of 31 lbs. in2 we should gain 5% in critical speed, or with reduced balance weights 6.4% (320 r.p.m.) Hs{Lord Ernest Hives - Chair}/Gry.{Shadwell Grylls} | ||