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I am looking for design criteria for twin tails vs. conventional.  For 
		
	
		
		
		
		
		
	
		 
		
	
	
	instance, what is the usual ratio of area for twin vertical fins vs. a single one--1:1? If anyone knows this ratio for the Ercoupe early models vs the M-10, that might be helpful. Any old aeronautical design books deal with this? Thanks!  | 
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