Smithsonian Report, 1962. ^Taylor 



Sleeve 

 showing 

 port closed 



Propeller 

 reducfion- 



Plate 26 



intake 



Exhausf 

 porfs 



Propeller 



shaff 



Sleeve sliowing porf 

 partiy open 



1. Bristol ''Hercules" slec\'c-valveeneinc, 14-c\l., radial air-ci>r)lcd, lf>50hp., 194(S. (Courtesy 



Bristol Aeropl.tne Co., Ltd.) 



2. Napier '"Lion" 12-c\-l. "\V"-type liquid-cooled engine. The only example of this form 

 ever widely used. Normal rating, 450 hp. A racing version of 800 hp. powered the 

 winner of the Schneider Trophy for seaplane speed in 1927, the Supermarine S-5 which 

 flew at 281.65 m.p.h. 



