Boxing the wake cracks Pawnee tail tubings or long term fatigue?
			 
			 
			
		
		
		
		
Ueli, 
 
slipping is not part of the instruction syllabus in Switzerland, except for FCL aerobatics. 
However, it is still a very useful skill and could have saved the odd DuoDiscus during outlandings. 
 
		
	
		
		
		
		
		
	
		 
		
	
	
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