Yeah, funnily enough crbbt, I did raise the notion of such a device back in post# 21005..
Dunno if its been tried, since in general PV's concern themselves with the top/opening of the exhaust,
perhaps some H. Ricardo sleeve-valve work considered the lower port issues in the past, if not variable nozzle ducts..

 
			
 
					
					
 Originally Posted by crbbt
 Originally Posted by crbbt
					
 
		
				
				
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