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 of a variable-pitch airscrew mechanism with control links and springs.
| Identifier | ExFiles\Box 179b\3\ img082 | |
| Date | 30th January 1933 | |
| ADJUSTING PLATE SPIRAL CONTROL SPRINGS THIS MEMBER CARRYING AIRSCREW BLADES CAN SLIDE FORWARD BLADE FREE TO ROTATE θ FIXED PLATE TO HUB ATTACHES TO STD PROP SHAFT CONTROL LINK HOLDING BLADE AT FIXED PITCH SPINNER ROLLS-ROYCE LTD PRINT ROOM JAN 30 1933 DERBY. | ||