Both of these surfaces are
flat and consist of a silk covering stretched upon bamboo ribs.
The horizontal surface is 6 feet 5 inches across, and 4 feet 9
inches from front to back. The vertical surface is of the same
width (6 feet 5 inches) but is only 3 feet 7 inches from front
to back. All the details of construction are shown in the
accompanying illustration.
Power is furnished by a very light (110 pounds) Darracq
motor, of the double-opposed-cylinder type. It has a bore of
4.118 inches, and stroke of 4.724 inches, runs at 1,800 r. p. m.,
and with a 6 1/2-foot propeller develops a thrust of 242 1/2
pounds
when the monoplane is held steady.
Bleriot--No. XI, the latest of the Bleriot productions, and
the greatest record maker of the lot, is 28 feet in spread of
main
plane, and depth of 6 feet in largest part. This would give a
main surface of 168 square feet, but as the ends of the plane
are sharply tapered from the rear, the actual surface is reduced
to 150 square feet. Projecting from the main frame is an
elongated tail (shown in the illustration) which carries the
horizontal and vertical rudders. The former is made in three
sections. The center piece is 6 feet 1 inch in spread, and 2 feet
10 inches in depth, containing 17 square feet of surface.
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