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Re: Speaking of IJN carriers, Why some port island, some starboard island? n/t
What is noticeable, and undoubtedly contributed to the problem, was that on both AKAGI and HIRYU, the islands were placed much farther aft than those on KAGA and SORYU, and were also generally larger.
According to SUNBURST, by Mark Beattie, initially it was intended on the two ships that the islands would be placed on the starboard side forward but it was felt that this would create turbulence that would negatively affect flight operations, and therefore the islands should be placed amidships instead. But on both ships, as construction had progressed too far, and the funnels were already located on the starboard side amidships, the islands were moved to the port side, to avoid the funnel gasses and smoke. There were subsequent complaints that the islands produced turbulence in landing operations, but it was not felt significant enough to warrant modifications.
According to "The Japanese Aircraft Carriers Soryu and Hiryu" by Miroslaw Skwiot, the supposed reason that moving the island to the port side was not repeated was that the mid ships placement of the island on the port side produced turbulent airflow affecting aircraft recovery. The Akagi trials after reconstruction showed this issue, but construction to Hiryu had progressed far enough along that no more changes could be made. The lessons were incorporated into the design of the next class (Shokaku class).