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).
Material test specifications for Cast Aluminium Alloy Timing Gears used on the Lincoln Zephyr.
| Identifier | ExFiles\Box 124\2\ scan0248 | |
| Date | 9th October 1940 | |
| COPY RM{William Robotham - Chief Engineer} 1044 Material Test Laboratory HL/GLT.13/MB.9.10.40. re:Cast Aluminium Alloy Timing Gears as used on Lincoln Zephyr -------------------------- Herewith the specification limits for Chemical Analysis and hardness worked to on the production of this part Copper .. .. .. .. .. .. 6.0 - 8.0 % Silicon .. .. .. .. .. .. 1.0--2.15% Iron .. .. .. .. .. .. .. 1.0 % Maximum Zinc .. .. .. .. .. .. .. 0.6 % " Magnesium .. .. .. .. .. .. 0.10 - 0.20 % Titanium.. .. .. .. .. .. .. 0.20 Maximum Aluminium .. .. .. .. .. .. Balance Other impurities .. .. .. ..1.0 % " ___________ Brindell 70-90. HL/GLT. | ||