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).
Manufacturing issues with air pump filters, specifically porosity in aluminium castings and achieving an air-tight seal.
| Identifier | ExFiles\Box 77\4\ scan0083 | |
| Date | 14th April 1921 | |
| X4197 W.W. 262a (50 T) (S H.{Arthur M. Hanbury - Head Complaints} 986, 19-2-21) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 303S To Da.{Bernard Day - Chassis Design} from Hs.{Lord Ernest Hives - Chair} c. to BY X4197 FILTER FOR R.R. AIR PUMP. Hs{Lord Ernest Hives - Chair}4/LG14.4.21. We cannot make the Filters designed for the R.R. Air Pump, air-tight. We first had trouble because of the aluminium castings being porous. We overcame this by enamelling and stoving the castings. Although we have overcome the leakage due to porosity, we cannot make the joint between the two halves to stand up to 100 lbs. pressure. We have tried leather in place of fibre - this is very much better than fibre but still does not prevent leaks. more We had thought of getting some/castings made up in bronze but we suggest that it may be advisable to modify the design so that it is more practicable as regards making it air-tight. Hs.{Lord Ernest Hives - Chair} | ||