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).
The weight difference between a standard and a lightened Goshawk flywheel.
| Identifier | ExFiles\Box 107\4\ scan0086 | |
| Date | 5th April 1928 | |
| To Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} from RHC.{R. H. Coverley - Production Engineer} X.4538 RHC{R. H. Coverley - Production Engineer}3/BE5.4.28. RE: LIGHTENED GOSHAWK FLYWHEEL We give below the difference in weight of the lightened flywheel compared with the Standard, which was fitted to 11.G.III. Weight of Standard Flywheel........... 69.625 lbs. Weight of Lightened Flywheel G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 51212... 41.000 lbs. Difference in Weight.. 28.625 lbs. RHC.{R. H. Coverley - Production Engineer} [Signature] | ||