Catalogue description AS Experimental Department (Flight Section): Development of AS Sapphire Series jet turbine engines

It has been considered possible to increase the mass flow through the Sa.7 compressor, the compressor pressure ratio being increased in proportion. With this development in mind, and allowing the engine to run at a higher combustion temperature by using cooled turbine, the performance of a new series of Sapphire engines has been investigated. These engines are developments of the Sa.7: a) Sa.8 Sa.7 with the static take-of combustion temperature (T3t) increased from 1125degK to 1250degK. b) Sa.9 Sa.7 with the mass flow at take-off increased by 11.8 ie from 170 lb/sec to 190 lb/sec. c) Sa.10 Sa.7 with T3t increased to 1250degK and mass flow increased by 11.8 at take-off