Congrats on another stellar issue (September 2011). It was interesting timing-or good planning-to have articles on the issue-plagued Jumo 222 and the problematic R-3350 in the same issue. Robert Guttman alludes to the Allison V-3420 but doesn't mention the Boeing XB-39, and Stephan Wilkinson doesn't mention it in his article about the R-3350. The XB-39 [shown above] was a hedge against the 3350 not panning out and putting the B-29 program in jeopardy. What a providential alignment of the stars that Chrysler's Dodge division was selected to build and develop the Double Cyclone; if not for their dedicated engineers, the 3350 would be just another "coulda-been" piece of aviation trivia.
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