In a flying boat, the main source of buoyancy is the fuselage, which acts like a ship’s hull in the water because the fuselage’s underside has been hydrodynamically. I read also that james laing was the very first sunderland shipbuilder to build in iron. the deptford business was incorporated on oct. 3, 1898 as ‘sir james laing. Yahoo!-abc news network | © 2017 abc news internet ventures. all rights reserved..