A Three-Component, Strain-Gauged Sting Balance for Use in Small Low-Speed Wind Tunnels

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Abstract
In preparation for the wind tunnel testing of a series of aerodynamic research models a strain-gauged balance was sought which could be successfully made without the use of sophisticated tools. The principal requirements which influenced the design of the balance were: (a) It must enable lift, drag and pitching moment to be measured. (b) Deformation of the balance under the aerodynamic loads to be small. (c) Use of only basic workshop tools. (d) Short manufacturing time. Further, the models were to be sting mounted at one end of the balance with their span vertical. The other end of the balance was to be rigidly fixed to a supporting stand which would be mounted on the wind tunnel turntable to permit incidence variation (Fig. 5).

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