HM 170 Open wind tunnel

1 inlet contour, 2 flow straightener, 3 nozzle, 4 measuring section, 5 model, 6 force sensor, 7 display and control unit, 8 diffuser, 9 switch cabinet, 10 inclined tube manometer, 11 axial fan


A wind tunnel is the classic experiment system for aerodynamic flow experiments. The model being studied remains at rest while the flow medium is set in motion, and thus the desired flow around the model is generated.

HM 170 is an “Eiffel” type open wind tunnel used to demonstrate and measure the aerodynamic properties of various models. For this purpose, air is drawn in from the environment and accelerated. The air flows around a model, such as an aerofoil, in a measuring section. The air is then decelerated in a diffuser and pumped back into the open by a fan.

The carefully designed nozzle contour and a flow straightener ensure a uniform velocity distribution with little turbulence in the closed measuring section. The flow cross-section of the measuring section is square. The built-in axial fan with outlet guide vane system and a variable-speed drive is characterised by an energy-efficient operation at high efficiency. Air velocities of up to 28m/s can be reached in this open wind tunnel. The trainer is equipped with an electronic two-component force sensor. Lift and drag are detected and displayed digitally. The air velocity in the measuring section is displayed on the inclined tube manometer. The tube manometers HM 170.50 or the electronic pressure measurement HM 170.55 are recommended for measuring the pressure distribution on bodies.

By using the system for data acquisition HM 170.60, the measured values for velocity, forces, moment, displacement/angle, and differential pressure can be transferred to a PC where they can be analysed with the software.

Extensive accessories allow a variety of experiments, for example lift measurements, pressure distributions, boundary layer analysis or visualisation of streamlines.


  1. experiments from the field of aerodynamics and fluid mechanics with an “Eiffel” type wind tunnel
  2. wide range of accessories available
  3. transparent, closed measuring section
  4. inlet contour, nozzle and diffuser made of GRP
  5. variable-speed fan motor for energy-efficient operation
  6. flow straightener reduces turbulence
  7. electronic two-component force sensor for measuring the flow forces
  8. inclined tube manometer for displaying the air velocity
  9. digital display of drag and lift
  10. display of measured values for velocity, forces, moment, displacement/angle, and differential pressure using system for data acquisition HM 170.60
Technical data
Measuring section
  • flow cross-section WxH: 292x292mm
  • length: 420mm
  • wind velocity: 3,1…28m/s
Axial fan
  • power consumption: 2,55kW
Measuring ranges
  • force: 2x ±4N
  • velocity: 3,1…28m/s
  • angle: 0…360°
230V, 50Hz, 1 phase 230V, 60Hz, 1 phase; 230V, 60Hz, 3 phases UL/CSA optional

Dimensions and weight

LxWxH: 2870x890x1540mm Weight: approx. 250kg

  • experiments with accessories
    • determine drag and lift coefficients for different models
    • pressure distribution on bodies immersed in a flow
    • boundary layer analysis
    • investigation of flutter
    • wake measurement
  • in conjunction with the fog generator HM 170.52
    • visualisation of streamlines
  • open wind tunnel for a variety of aerodynamic experiments
  • homogeneous flow through the flow straightener and special nozzle contour
  • transparent measuring section
optional Drag body:
  • HM 170.01 Drag body sphere
  • HM 170.02 Drag body hemisphere
  • HM 170.03 Drag body circular disc
  • HM 170.04 Drag body circular ring
  • HM 170.05 Drag body square plate
  • HM 170.07 Drag body cylinder
  • HM 170.08 Drag body streamline body
  • HM 170.10 Drag body paraboloid
  • HM 170.11 Drag body concave shape
  • HM 170.21 Aerofoil with slat and slot flap
Lift body
  • HM 170.06 Lift body flag
  • HM 170.09 Lift body aerofoil NACA 0015
  • HM 170.12 Lift body square plate
  • HM 170.13 Lift body aerofoil NACA 54118
  • HM 170.14 Lift body aerofoil NACA 4415
  • HM 170.52 Fog Generator
Pressure distribution
  • HM 170.22 Pressure distribution on an aerofoil NACA 0015
  • HM 170.26 Pressure distribution on an aerofoil NACA 54118
  • HM 170.27 Pressure distribution on an aerofoil NACA 4415
  • HM 170.23 Pressure distribution on a cylinder
Other experiments
  • HM 170.20 Aerofoil, Spring-Mounted
  • HM 170.24 Boundary layer analysis with Pitot tube
  • HM 170.25 Model "Bernoulli"
  • HM 170.28 Wake measurement
Measuring instruments
  • HM 170.31 Pitot tube
  • HM 170.32 Pitot tube, small
  • HM 170.33 Pitotstatic tube
  • HM 170.40 Three-Component Force Sensor
  • HM 170.50 16 Tube Manometers, 600mm
  • HM 170.55 Electronic Pressure Measurement, 18x 0...500Pa
  • HM 170.53 Differential pressure manometer
  • HM 170.60 System for data acquisition
  • HM 170.61 Electronic Displacement Measurement