The Development of Turbine Engines in France—II: An Account of Some of the Experimental Work Carried Out by the Research Departments of the Societe Rateau at La Courneuve

THE IMPORTANCE OF DILUTION FOR TURBO‐JETS The S.R.A. 1 turbo‐jet engine is of the ducted‐fan‐type. This arrangement seemed the best at the time when the problem (of good performance) was presented, and the results obtained have since confirmed the original expectations. Most other turbo‐jets, however, if not all, are now of the undivided‐flow type.