HM 170.27 with the airfoil profile NACA 4415 – used in the wind tunnel HM 170 – allows the pressure distribution to be recorded. The aerofoil is used in the wind tunnel’s two-component force sensor. The angle of attack is varied by rotating the mount. The surface of the aerofoil is fitted with measuring holes, which are arranged so that interaction is virtually eliminated. Each measuring point is fitted with a hose connection. The aerofoil is enclosed by two side panels to prevent secondary flows.
The static pressures are displayed on the tube manometers HM 170.50 or in the electronic pressure measurement HM 170.55.