FIELD: performance of experiments in wind tunnel. SUBSTANCE: four-barrel pneumatic extension piece is composed of holder and body with head part manufactured in the form of tetrahedron with similar opposite faces. Take-in holes are arranged on symmetry axes of faces and are equally distant from lip of hole of opposite faces as well as from lip of hole of adjacent faces. Angle between one pair of faces is 50 deg and between other pair of faces is 40 deg. This structural design makes it possible to enhance accuracy of determined values within wide range of change of bevel angles of flow. EFFECT: enhanced accuracy of determined values. 3 dwg
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