Design notes regarding dust protection for a thrust race and modifications to an 8 arm star spring.
| Identifier | ExFiles\Box 121\3\ scan0144 | |
| Date | 21th July 1941 | |
| Rm {William Robotham - Chief Engineer} /MHR. {M. H. Rigby} 12/ST.21.7.41 - 2 - side. This will protect the thrust race from dust. Something will have to be done experimentally to prevent dust entering between the star spring arms. The centre of the 8 arm star spring should be a plain hole to fit on the shortened sleeve GB.4061. The outside diameter of the flat portion should be about 0.700" greater than the diameter of this hole; while the outside diameter of the washer supporting it should be slightly larger again. The arms should be similar to those on G. {Mr Griffiths - Chief Accountant / Mr Gnapp} 5J180, apart from the gauge and free movement. Rm {William Robotham - Chief Engineer} /MHR. {M. H. Rigby} | ||
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).