the present invention relates to pressure probes for measuring the aerodynamic flight parameters of an aircraft and more particularly those in which the orifices for measuring the static pressure and total pressure are located on a moving angle - of - attack or angle - of - sideslip measurement vane designed to be oriented in the direction of the wind . it consists of a pneumatic rotary joint employing flexible tubings rather than friction rotary joints between abutted parts of rigid tubings . such a joint offers a much smaller resistance to the rotational movement of the moving vane , which consequently is oriented with greater accuracy in the direction of the wind .