29.08.2009, 22:51
![[Image: XB-39_Superfortress.jpg]](http://upload.wikimedia.org/wikipedia/en/2/2b/XB-39_Superfortress.jpg)
XB-39: B-29 with Aliison V-3420 inline engines.
![[Image: 7c47745153041806.jpg]](http://images.zhjunshi.com/20090628/7c47745153041806.jpg)
XB-44: B-29 with Pratt & Whitney R-4360 Wasp Major radials.
B-17 Turboprop testbed
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