This is interesting. They got a bit less thrust out of
the exhaust stacks with ejectors installed.
I always thought these were supposed to improve the thrust
from the exhaust gasses.

This is a rather comprehensive full scale test of exhaust
ejectors. The ejectors did not help the cooling all that much more than
a good set of cowl flaps. Note the long length of the straight 
and diffuser sections. I guess they were deemed not worth the 
weight, cost and trouble. Of course radial engines used ram air
type scoops and not NACA scoops.


********************************************************************
2715. Acker, Loren W Kleinknecht, Kenneth S , ***Flight comparison of
	performance and cooling characteristics of exhaust-ejector
	installation with exhaust-collector-ring installation ,
	<http://naca.larc.nasa.gov/reports/1947/naca-rm-e6l13a/>* NACA
	RM-E6L13a , February 14, 1947 , pp. 37 .
***********************************************************************

Paul Lamar
 
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