309 THE N. A.. C. A. VAKIABLE-DENSITY "WIND TUNNEL moment. The rear vertical linkage is therefore called ated completely from outside the tank. The balance the moment balance, and the model is usually mounted measures the lift and drag forces and the pitching so that this balance measures directly… … Fiquke 7—Photograph of one of the drag-linkage beU cranks moment. The forward vertical linkage is called the lift balance because it measures most of the lift, although the total lift is the sum of the forces measured by the Hit and moment beams. Fioote 6.—Diagrammatic drawing of the Intersection…
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