This Day in Aviation History

July 28th, 1935
The Boeing Model 299, prototype of the B-17 Flying Fortress, makes its first flight in Seattle, Washington.

National Museum of the US Air Force, BOEING XB-17 (MODEL 299):
http://1.usa.gov/1l8artG

Note the Model 299 used four Pratt & Whitney R-1690 radials of 750 hp each.  The B-17 uses four Wright R-1820-97 “Cyclone”radial engines of 1,200 hp (895 kW) each.

Wikipedia, Boeing B-17 Flying Fortress:   http://bit.ly/1rYYPy2

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