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).
List of Phantom III light alloy castings detailing their weights in aluminum and potential weight savings.
| Identifier | ExFiles\Box 140\3\ scan0057 | |
| Date | 25th August 1936 | |
| -5- Phantom III Light Alloy Castings. Part Weight in Aluminium Cylinder Block and crankcase 135 lbs. Bottom Half 25 " Timing Case 6 " Clutch Housing 10 " Gearbox 25 " Dashboard 29 " Rocker Covers 11 " Water Rails 6 " Induction Pipes and Hot Spot 11 " Oil Filter 4 " Brake Gear (future) 40 " ____ 302 lbs. Magnesium 30% lighter than alum. Total possible weight saving - 100 lbs. | ||