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).
New design for the Phantom III rear hub brake drum and end plate.
| Identifier | ExFiles\Box 137\5\ scan0200 | |
| Date | 21th March 1938 | |
| HPS.{Horace Percy Smith - Experimental Factory Mgr} [crossed out] c. Rm.{William Robotham - Chief Engineer} [crossed out] c. Rm{William Robotham - Chief Engineer}/APM. [crossed out] 1159. BY/Ald.{F. Allwood - Experimental Design}1/G.21.3.38. PHANTOM III. REAR HUBS - SECTION 6170. Please receive herewith two blueprints of each of the following (one extra where marked *) :- * Ex.S.624/624A Brake Drum 2 off Ex.S.624A. only. Ex.S.625 End Plate 2 off. Note that Ex.S.624 Brake Drum with cast ribs, shown on the first drawing, is not required. In order to save the cost of dies the end plates may be made from commercial plate. The purpose of this new design is to provide flexibility in the end plate in order to allow for contraction during cooling after casting the drum. The above pieces replace the following which were called for in memo BY/Ald.{F. Allwood - Experimental Design}1/G.4.3.38 :- Ex.S.545 Brake Drum with Cast-in End Plate. Ex.S.546 End Plate. Kindly instruct one set. ael BY/Ald.{F. Allwood - Experimental Design} | ||