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).
Casting aluminium brake drums and a list of alternative brake and hub designs.
| Identifier | ExFiles\Box 120\1\ scan0353 | |
| Date | 11th August 1941 | |
| - 2 - The castings should be left in the mould for one or two hours after pouring. One casting which was knocked out as soon as possible burst. For machining the casting must be set up so that the liner is true. The cast aluminium drums have not suffered from buckling. The reason for this is that the shallow ribs at either end of the liner prevent any axial movement between the latter and the former. The existing design of cast aluminium drum is suitable for the rear axles and for front axles with wide track yoke pieces. For narrow track yoke pieces the rib at the open end must be moved along the drum to clear the r triangle. Other designs of cast aluminium drums and hubs have been prepared. Below is a list. PL.536. Wider Rear Brakes with Aluminium Drums and Shoes, Senior Range. (See Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions}3/SW. 28.5.41. and Ru/HH.7/SW. 24.6.41.) PL.664. Combined Front Hub and Drum in Aluminium, Senior Range. (See Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions}4/SW. 28.5.41. and Ru/HH.8/SW. 11.8.41.) PL.674. Wider Front Brakes, Senior Range, with Aluminium, Shoes and combined hub and drum. (See Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions}14/JH. 18.7.41.) PL.684. Wider Front Brakes with Aluminium Hub Drum and Shoes, Buick Type Pivot, Senior Range. (See Ev{Ivan Evernden - coachwork}/DB.{Donald Bastow - Suspensions}15/HH. 19.7.41.) PJH/GB. | ||