In May of 1944 the USAF cancelled its B-35 programme, foreseeing the inadequacy of this bomber in thefuture. At the same time, however, it authorised the completion of two of these to be modified & fit withjet propulsion engines. The first YB-49 took flight on October 21, 1947 powered by eight Allison J35turbojets, which, in the end, were not very reliable. The many problems notwithstanding, the YB-49 didshow promise, with the exception of its autonomy factor, reduced due to the high fuel consumption of thatgeneration’s engines. One of its great advantages was something that in those days was not considered veryimportant: the fact that the YB-49 often disappeared from the radar screens because of its weak marking. The problem which eventually signed the fate of this promising aircraft was the excessively thick airfoilsection which limited its cruising speed, just when this factor seemed to be the most important qualityneeded for a combat airplane. New Release