The 1000 HP traffic airplane of the Zeppelin Works in Staaken Page: 4 of 10
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or angle pieces (Fig. 6). To the front and rear sides of the box
girder are attached lattice ribs, some covered with thin sheet
metal and some with linen fabric. The thickness of the sheet
metal parts of the boxgirders, as likewise that of the angle
pieces and rivets, varies between 0.6 mm. and 3 mm., according to
the different stresses to be withstood. In order that the cover-
ing may not buckle between the spars, hollow inside girders d
(Fig. 7) are riveted throughout the entire span.
Contrary to present experience, there was at first some un-
certainty regarding the probable stresses on the members of the
box girder employed for stiffening the wing. In order, therefore,
to assure the structural safety of the first airplane, two lift
cables were added under each wing, so attached that the bending
moments in the wing girders are offset as much as possible.
These cables give the wings an exceptionally large coefficient of
safety during flight. They exert a favorable influence even on
the ground and in landing. In no case has any slackness of these
cables been observed.
The wings have a surface area of 106 square meters, a span
of 31 meters, and an average thickness of only 0.6 meter. With
reference to the mean chord, the monoplane has an aspect ratio of
1 9.1, while hitherto the ratios have usually been between
1 5 and 1 : 6.5. This favorable aspect ratio lessens the drag
so much that the total drag, including that of the lift cables,
is still less than that on other monoplanes with no outside stays.
Consequently, the lift-drag ratio of the whole airplane is a
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Rohrbach, A. K. The 1000 HP traffic airplane of the Zeppelin Works in Staaken, report, September 1921; (digital.library.unt.edu/ark:/67531/metadc53613/m1/4/: accessed June 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.