Looking like some great beast took a bite out of its fuselage, the Great Lakes XSG-1 never went beyond this single prototype.
The Columbia XJL-1 was another also-ran in the world of US Navy seaplanes. This example (BuNo 31399) survives today at the Yanks Air Museum in California.
The Jive Bomber 
If the XSG-1 was attacked by an enemy fighter the gunner would have had to reach outside the aircraft to lift the machine gun from its stowage point in order to fit it to the cumbersome rack mounting in his compartment.
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