Strut-mounted drag balance

Details Strut-mounted drag balance Strut-mounted drag balance

1997-03-25

1999-04-27

Biegel, Ronald

Measuring and testing

Wind tunnel: aerodynamic wing and propeller study

73862627, 7317015, B63B 908

Patent

active

058981098

ABSTRACT:
A drag balance for measuring drag forces on a model is described which mos within a hollow region of a streamlined strut. The strut is attached to a carriage for towing the model through a medium. The drag balance has a ground frame attached inside the strut and a balance frame attached to the flat plate at the base of the strut. The ground frame and balance frame are connected by flexures which allow only a small amount of movement of the balance frame and model relative to the ground frame and strut in the towing direction. Strain gages are attached to one or more of the flexures to determine the amount of bending in the flexures and thus obtain a measure of the drag forces exerted on the model. Mounting the drag balance within the streamlined strut minimizes turbulence and allows the drag balance to be connected directly to the model at the base of the strut such that drag forces on the model are accurately determined.

REFERENCES:
patent: 2826914 (1958-03-01), Reiley
patent: 3380299 (1968-04-01), Seymour
patent: 3878714 (1975-04-01), Protta et al.
patent: 4604906 (1986-08-01), Scarpa

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