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).
Lorraine, Isotta, and Hispano aero engines, and a new supercharger design.
| Identifier | WestWitteringFiles\V\December1930-February1931\ Scan037 | |
| Date | 20th December 1930 | |
| -7- HS{Lord Ernest Hives - Chair}/ACL.1/MJ.20.12.30.Contd. Lorraine. The latest Lorraine engines have an alum. cylinder block with wet liners. The liners are screwed into the cylinder head and the base of them bolted to the crankcase. The cylinder block extends to within about 2" of the crankcase and the seal between the block and liner is by a single rubber ring compressed into position by a steel gland ring screwing into the alum block. The rubber is insulated from the cylinder liner by a box like platform which appears to be screwed to the liner (see sketch). This construction gives wide cylinder centres (space between cyls) and we should think would suffer from temperature distortion effects. Isotta. Isottas' exhibited a very neat 6 cyl. in line air cooled light aero engine. This was rated at 100/120 HP. and had a spur reduction gear. The engine was very similar in appearance to the British Cirrus. Of light aero engines the 100 HP. Hispano 6 cyl. in line engine water cooled was certainly the finest example seen. Most of the other aero engines were very conventional and no features of interest to report. SUPERCHARGERS. I had a talk to the representative of M.{Mr Moon / Mr Moore} Birman of the De Laval Steam Turbine Co. He has patented certain features of an impeller for operation in high speed aero superchargers and has recently designed an impeller for the Curtiss Co. of America employing his principles. The chief feature of this impeller is the use of 'backward discharge' vanes of hyperbolic curvature. The chief claim appears to be increased efficiency for high speed operation, greater strength than can be obtained with the normal backward discharge impellers and it is easy to manufacture. A sketch is appended showing the form of impeller he employs. Appended also is a description and the claims for this design together with some curves. Perhaps Lr.{Mr Ellor} would tell us if he considers the scheme of any interest. Should further information be required it can be obtained from Birmanns representative - Mr. Jean Goriany, 4 Sq. des Aigles, Chantilly, Oise - France. | ||