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 strength of drilled exhaust valves for the Spectre engine and proposing a switch to undrilled valves.
| Identifier | ExFiles\Box 96\2\ scan0056 | |
| Date | 9th September 1935 | |
| To By.{R.W. Bailey - Chief Engineer} c. to E.{Mr Elliott - Chief Engineer} X354 Hs{Lord Ernest Hives - Chair}/Smth.8/KW.9.9.35. SpectreCodename for Phantom III Exhaust Valve. Now that we find that drilled exhaust valves are not strong enough for SpectreCodename for Phantom III, we think it would be advisable to give valves to E.86782, but undrilled, a piece number. Hs{Lord Ernest Hives - Chair}/Smth. | ||