Model 299 - Prototype
Model 299 is a prototype the Boeing, equipped with four Pratt & Whitney Hornet radial engines with 560 kW each (762 hp); the prototype didn't have any military name, however, called XB-17 from time to time also. The first flight took place on July 28th, 1935 and this flew Boeing model 299 3 weeks later non-stop from Seattle (there lies the Boeing plant) after Wright Field in Ohio where the acceptance test took place. The 3380 km long way put the machine back with an average speed of 406 km/h in approx. 9 hours.
Understandable based himself on this considerable performance excellent expectations of this sample and also the course of the initial prooftesting supported Boeings optimism.
However, a message destroyed all hopes on October 30th, 1935: The prototype had been destroyed at a start accident. The accident examination showed that one had started the machine with blocked oars. In this accident major Ployer Hill and Boeing boss came for the U.S. Air Force pilot-test pilot Leslie Turner were killed.
The good prooftesting results before the accident brought the US Army air to corps for the decision to obtain 13 YB-17 of (later Y1B-17) and an airplane for floor tests.