In 1953, after long studies into the records of boats of the Pacific in the libraries and museums of Britain, and inspired by Eric de Bisschop's book The voyage of the Kaimiloa,[1] he designed and built the first British ocean-going double-canoe-catamaran, the Tangaroa (length 23 feet 6 inches (7.16 m)) and in 1955–56 sailed with Jutta Schultze-Rhonhof and Ruth Merseburger,[2][3] across the Atlantic to Trinidad – the beginning of cruising and transatlantic crossing with a catamaran.[8] In 1987-92 James and his partners built a new flagship, the 63-foot catamaran Spirit of Gaia, which they sailed into the Pacific and round the world, to study Indo-Pacific canoe-craft (1994–98).[citation needed] Wharram designs are inspired by Polynesian double canoes and typically have an open deck, with small deckpod(s) for crew shelter.Most modern catamarans are built as a single rigid structure thereby sustaining greater forces and stresses in waves, whereas on Wharrams the separate hulls are connected to the crossbeams with (synthetic) rope lashings, in true Polynesian style.[13] Many of the cabin interiors are designed to flexy-space principles, the concept being multi-purpose space on a human scale, in which less is more and the simpler the construction, the better.