Turning the W.12 into a monoplane

The W.29's monoplane conversion retained the W.12's proven fuselage, floats, and tail arrangement while removing the upper wing and enlarging the lower one. The change was simple in outline but demanded careful structural work for reliable operation over water. Castiglioni's willingness to finance designers who had already delivered successful aircraft supported that development. Hans Klemm performed stress calculations and much of the detailed drafting under Heinkel's supervision. Their division of work followed a master-apprentice pattern: the senior designer sketched and checked ideas while a trained assistant produced the additional drawings. Design credit therefore involved both the originating concept and the detailed calculations needed to make it work.