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).
Laboratory report showing photographs of a cracked and a broken exhaust valve from a Wraith.
| Identifier | ExFiles\Box 10\3\ 03-page075 | |
| Date | 10th September 1937 | |
| ROLLS-ROYCE LABORATORY REPORT H1/SJW.1/GS.10.9.37. x5 M.1,407/1 CRACKED WRAITH EXHAUST VALVE. x5 M.1,407/2 BROKEN EXHAUST VALVE FROM WRAITH (26.G.VI) | ||