Foa 



7'"/ 



■i' 



5 6 7 

 ROTOR NO. 2 



10 11 



12 



"'I 

 1 



10 



ROTOR NO 2 



Fig. 17 - Rotor No. 2 of the Vennos water-water 

 test series (Ref. 16) 



that left some room for error (Ref. 16). It was found in these and subsequent 

 tests that apparently minor modifications of external shape or internal ducting 

 in these models could produce major changes of performance. 



Also plotted in Fig. 9 is an air-to-air test point reported by Hohenemser in 

 Ref. 5. Finally, for the purpose of direct comparison with the conventional ejec- 

 tor, there is also shown a typical constant-area ejector test point (Ref. 17). 



Results of air-to-air experiments conducted by Hohenemser (Ref. 5) are 

 compared in Fig. 11 with the predictions of the two-dimensional theory and of 

 the strip theory. The experimental points fall very close to the performance 

 envelope according to the strip theory. However, as has already been noted. 



1368 



