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#13
February 1st 04, 07:51 AM
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WaltBJ wrote:
Along the same lines I have seen a picture of the XB39, a B29 with the big 'double Allison' 24 cylinder engine. (2 V12s side by side geared to a common drive shaft.) I presume engine bugs forestalled its further development. Walt BJ From the USAF Museum web site. "The XB-39 project was basically a proof-of-concept project to demonstrate performance with liquid cooled 'Vee' engines. It was also insurance against shortages of the production engine. Only XB-39 was built; it was delivered the the US Army Air Force in early 1944 for testing. Most of the problems with the standard B-29 production version were fixed by mid-1944 and no orders for the XB-39 were placed." http://www.wpafb.af.mil/museum/resea...bers/b3-88.htm 
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