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).
Page of calculations comparing the weight of a production Wraith with one using a lighter gauge frame.
| Identifier | ExFiles\Box 10\5\ 05-page097 | |
| Date | 30th August 1938 | |
| -2- Rm{William Robotham - Chief Engineer}/Cr.{Mr Cra???ster / Mr Chichester}9/JH.30.8.38. Cont'd.{John DeLooze - Company Secretary} .128" gauge frame instead of .104. 40 approx. 118½ lbs. Subtracting the weight of 118½ lbs. from the production Wraith weight one gets 3043½ lbs., or without the lighter gauge frame 3083½ lbs. Rm{William Robotham - Chief Engineer}/Cr.{Mr Cra???ster / Mr Chichester} | ||