Ad: This forum contains affiliate links to products on Amazon and eBay. More information in Terms and rules
That's the Martin 145 which was designated the XB-16. It lost out to the Boeing B-15.it's identified as Materiel Division Design 361. The caption reported a wingspan of 122 feet and a gross weight of 83,000 pounds. Power was to be provided by four R-2800s. One of the things I find most fascinating is the seeming permeability between the drafting boards of the Materiel Division/Command and the vendors...it's not always clear who was drawing from whom. View attachment 541278