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).
Design position report for the P.V.XII engine detailing the status of specific items.
| Identifier | ExFiles\Box 30\4\ Scan195 | |
| Date | 1st June 1934 guessed | |
| (8) ITEM. DESIGN POSITION. -------------------------------------------------------------------------- P.V.XII ENGINE - CONTINUED. --------------------------- Lightened air screw reduction gear. 90% completed. Alternative water connections for experimental Completed. test. | ||