From Wiki...
"The B7A's outer wing panels were designed to fold upwards hydraulically for carrier stowage, reducing its overall span from 14.4 m (47 ft) to approximately 7.9 m (26 ft)."
I looked and....
"Francillon, Ph.D., René J. Japanese Aircraft of the Pacific War. London: Putnam Company Ltd., 1979."
I know is a good source but I have never got around to buying a copy. I am always being distracted by a multitude of other books to buy!
I think I will get it know.