The recent methods for surface pressure and skin friction measurements on the models.

The work presents experimental and theoretical evaluations of the ultimate measurement possibilities and application fields of the PSP and mechanical skin friction gages. PSP provides visualization and measurement of the pressure distribution on the model surface without usual pressure taps. The mechanical skin friction gages have been developed for point measurements of the friction stresses on the surface. It was made attempt to unite small sizes of hot-wire film gage with possibility for direct measurements of the skin friction as in balances with a floating element. The results of the evaluations are illustrated by the examples of pressure distribution measurements on the surface of the different aircraft models, propeller blades in transonic and supersonic wind tunnels, and by measurements of the skin friction on the test section walls of the trans- and supersonic wind tunnels and on the wing surface of the supersonic transport aircraft model.