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).
Blueprint for smaller diameter inlet and exhaust valves for a Lighter Phantom Engine.
| Identifier | ExFiles\Box 42\4\ Scan063 | |
| Date | 27th November 1926 | |
| LIGHTER PHANTOM ENGINE - SMALLER DIAM VALVES - BOTH INLET & EXHAUST. 1.600 DIA RADIUS 1.750 DIA C.D.B/H/106 27.11.26 | ||