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Early all-metal monoplanes used corrugated surfaces to strengthen the airframe. You'll notice this was also used with other early large monoplanes of the time, like Ford's 1-AS/2-AT/3-AT/5-AT(trimotor), Tupolev's TB-1/ANT-4/TB-3/ANT-20 and several other aircraft makers used this structural technique.what was junkers insistency on the corrugated skin..even on the top of the wings? was he able to lighten and aircraft sub structures because the skin was going to add so much strength do to the its configuration?