Boeing YB-29J Superfortress

Last revised April 17, 2000

Six B-29s were fitted with R-3350-CA-2 fuel injection engines and the revised "Andy Gump" nacelles that were intended for late production B-29As in a program to service test these new engine installations. These aircraft were redesignated YB-29J.

Some of these YB-29Js were used for photo-reconnaissance work as RB-29J. Two of them (44-86398 and 44-86402) were converted to aerial tankers under the designation YKB-29J as part of a test of the Boeing-developed boom aerial refuelling system that was introduced in the KB-29P program. However, these two aircraft retained their service test and J-series designations.


  1. Warbird History--B-29 Superfortress, Chester Marshall, Motorbooks International, 1993.

  2. The Boeing B-29 Superfortress, Mich Mayborn, Aircraft in Profile, Doubleday, 1969.

  3. B-29 Superfortress, John Pimlott, Gallery Books, 1980.

  4. Boeing Aircraft Since 1916, Peter M. Bowers, Naval Institute Press, 1989.