I'm wondering if those planes used the same 28 cylinder radial aircraft engines that had four rows of seven cylinders per row that the Spruce Goose maybe the B29 Bombers used them also and Convair B36 bombers used
I took a tour of the Spruce Goose display when it was in SO CA years ago, I'm trying to remember the exact C.I. but I can't now I think it was 4300 and some more C.I. for each motor with compound supercharging and turbo charging I can't remember the correct amount of HP for those engines now, I'm thinking 2800+ H.P.