Open Wind Tunnel


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. FM 300 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 characterized 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 FM 300.50 or the electronic pressure measurement FM 300.55 are recommended for measuring the pressure distribution on bodies. By using the system for data acquisition FM 300.60, the measured values for velocity, forces, moment, displacement/angle, and differential pressure can be transferred to a PC where they can be analyzed with the software. Extensive accessories allow a variety of experiments, for example lift measurements, pressure distributions, boundary layer analysis or visualization 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. Inclined tube manometer for displaying the air velocity
  8. Electronic two-component force sensor for measuring the drag and lift forces
  9. Digital display of drag and lift on the measuring amplifier
  10. Angle display on a scale
  11. Optional: display of measured values for velocity, forces, moment, displacement/angle, and differential pressure using system for data acquisition FM 300.60
  12. ADF software for data acquisition via Ethernet under Windows 8.1, 10   

Technical Details

  1. Flow cross-section WxH: 292x292mm
  2. Length: 420mm
  3. Wind velocity: 3,1…28m/s
  4. Axial fan
  5. Power consumption: 2,2kW

Measuring ranges:

  • Force:
    • Lift: ±4N
    • Drag: ±4N
  • Velocity: 3,1…28m/s
  • Angle: ±180°
  • 230V, 50Hz, 1 phase
  • 230V, 60Hz, 1 phase; 230V, 60Hz, 3 phases
  • UL/CSA optional