That, in consequence, machines having wing planes, driven _against_
one inertia of air by screws acting in the line, of flight against
another inertia of air, lose fifty per cent. of useful effect, besides
exposing to a head wind the cross section of the stationary screw wing
planes and the rotating screw discs; and supporting the dead weight of
the wing planes, and having all the screw slip in the line of flight,
and carrying slow and heavy engines.
That as a result of these conclusions, the supporting and propelling
power should be expressed in the rotation of screws combining both
functions, the position of whose planes of rotation to a fixed
horizontal line of direction determines the progress and speed of
machine upon other lines.
That the whole weight carried by the screws should be at all times
exactly below the center of gravity of the plane of support, whether
it be horizontal or inclined.
That while the _permanently_ positioned weight, such as the engines,
frame, holding screws, etc., may be rigidly connected to or around the
screw plane of support, the variable positioned weight, such as the
passenger and the car, should be connected by a _flexible joint_ to
the said plane of support.
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