A wing section in which the leading edge is well bent down below the rest of the lower surface.
A lighter than air craft in which sustentation is provided by a gas bag. It differs from a balloon in having a power plant, and is thus capable of flying in any desired direction regardless of the wind.
The total area of the disc swept out by the propeller tips.
Interruption in direction, or breaks in stream line flow. A body causing eddies or turbulence causes "Discontinuous flow." The surface separating the eddies and the continuous stream is called a "Surface of Discontinuity."
The volume or space occupied by a floating body.
A wing section in which both the top and bottom surfaces are given a convex camber or curvature.
A solution used for protecting and stretching the wing fabric.
The resistance offered to the forward motion of a surface or body moving through the air. As defined by the Advisory Committee this is the total resistance offered by the craft and includes both the resistance of the wings and body. This conception is confusing, hence the author has considered drag as being the forward resistance of the wings alone. The resistance of the structure is simply called the "Head resistance," and the sum of the resistances is the "Total resistance." This nomenclature was in existence before the Advisory Board proposed their definition.
As defined by the Advisory Board, the drift is the horizontal resistance offered by the wings alone. This is confusing since previous works defined "Drift" as the amount by which an aircraft was driven out of its normal path by wind gusts. According to usage, "Drift" is the sidewise deviation from the normal flight path.
The bracing wires used for resisting the drag stresses set up in the wing.