How about defining biggest?
Reason for my question:
For Douglas XTB2D-1, the weights are:
Empty weight: 18,405 lb (8,348 kg)
Loaded weight: 28,545 lb (12,948 kg)
Max takeoff weight: 34,760 lb (15,767 kg)
What would be the best comparable weight for "biggest" single engined a/c"?
If this was not fun, please disregard.