Headline News
B-47 Labs Step Up J57 Altitude Tests
Boeing Airplane Co. has converted two B-47B Stratojets to flying test beds for accelerated high-altitude flight trials of Pratt & Whitney Aircraft J57 turbojets used in the huge B-52 Stratofortress (AVIATION WEEK Mar. 22, p. 9). Technical observers believe the program is aimed at increasing the altitude ceiling of the B-52, currently understood to be limited by powerplant rather than by aerodynamic considerations.