Dear Mr. Corsi,
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We searched the National Archives Catalog and located Research and Development Files from Wright-Patterson Air Force Base, 1921 - 1951 in the Records of U.S. Air Force Commands, Activities, and Organizations (Record Group 342) which includes a file on the XB-15 Bomber, Heavy Duty. For more information about these records, please contact the National Archives at College Park - Textual Reference (RDT2) via email at Archives2reference@nara.gov.
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We also search online and located the following references:
We hope this is helpful. Best of luck with your research!
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Per Peter Bowers’ Boeing Aircraft Since 1916 (Naval Institute Press, 1989), the technical data for the XB-15 is as follows:
Accommodation: 10 crew
Power plant: 4x Pratt & Whitney R-1830-11 Twin Wasp 850 hp at 2,450 rpm at 5,000 feet (1,000 hp for take off)
Span: 149 feet
Length: 87 feet 7 inches
Height: 18 feet 1 inch
Wing area: 2,780 square feet
Empty weight: 37,709 lbs
Gross weight: 70,706 lbs
Maximum speed: 200 mph at 5,000 feet
Cruising speed: 152 mph at 60% power at 6,000 feet
Service ceiling: 18,900 feet
Range: 5,130 miles
Armament: Two .50 caliber machine guns, four .30 caliber machine guns, four 2,000 lb bombs
Boeing construction number: 1964
Army serial number: 35-277
I hope you find this information useful.