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).
Tests conducted on Siemens sparking plugs with 'Sinterkorund' ceramic insulators.
| Identifier | ExFiles\Box 58\2\ Scan073 | |
| Date | 3rd May 1934 | |
| AERONAUTICAL INSPECTION DIRECTORATE 3 - MAY 1934 MESSRS, ROLLS ROYCE, LTD. Report No...E/E&I.827. February, 1934. ROYAL AIRCRAFT ESTABLISHMENT, SOUTH FARNBOROUGH Tests on Siemens sparking plugs with "Sinterkorund" ceramic insulators. ..Ref:- E&I/Mat.701/11. A.M.Ref:- 224511/32/R.D.E.3. 'D' 1. Introductory. A number of Siemens "Sinterkorund" ceramic insulated sparking plugs with various heat and oil resisting characteristics, together with a sample insulator were received from R.D.E.3. for examination and test. 2. Description of the plug (attached Drg.E&I.4929, Fig.1). The chief feature of interest in this type of plug is the material used for the central electrode insulator which consists of a new ceramic insulating material termed "Sinterkorund" manufactured by Messrs. Siemens and Halske from aluminium oxide. Six types of these plugs were received and one insulator. Of the plugs three types A.G.10 - A.G.20 and A.G.30 were selected for test as being more interesting from an aero engine aspect. The insulator was used for temperature tests. The above three types of plugs are of similar construction and differ only as regards heat and oil resisting characteristics. One of the A.G.30 type was sectioned and is shown in the attached Fig.1. The plug is of the non-detachable type and therefore cannot be completely reconditioned. The central electrode consists of a tapered nickel rod the smaller end being roughened and passed up through the hole in the "Sinterkorund" insulator. The terminal is of steel and is screwed into the insulator and pressed on to the screwed roughened end of the nickel rod, the whole being finally secured within the insulator by cement. At the top of the insulator is an aluminium washer upon which the flange of the terminal beds. The terminal screw is No.3 B.A. | ||