One of the reasons for the longevity of the DC3 is that owing to shortcomings in the design process, and a fortuitous choice of the alloy used for the structure, the airframe is far stronger than required, and is almost totally proof against fatigue. 
DC-3s have flown successfully with much more powerful engines and have been grossly overloaded by accident, and got away with it. 
It was an enlarged version of the earlier DC-2 (which came second in the 1934 MacRobertson Melbourne Centenary Air Race from London, behind a specially designed DH88 Comet racer). During the evacuation of parts of China ahead of the Japanese a so-called DC 2 1/2, a DC3, with the shorter outer panel of a DC2 replacing one damaged by bombing, succeeded in flying about 40 passengers to Burma.
I seem to remember that in the early seventies, a DC-3 being used for crop dusting in NZ made a successful landing after losing most of one wing outboard of the engine in a midair collision.
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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