Standardization Tests of NACA No. 1 Wind Tunnel (1925)
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der test. BALANCES. In the course of the tests, three balances were used. The work on cylinders, the disk, and spheres was done on the N. P. L. type balance. A complete description of this instrument will be found in Technical Report No. 72. The accuracy and sensitivity have been somewhat im-… … Fig, 3.—Static pressure gradient. Fig. 4.—Variation of static pressure gradient with dynamic pressure. In the airfoil tests use was made of the' Vire balance.'' This apparatus, schematically shown in Figure 1, will be seen to consist of two independent balances, each of which measure one component…
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