Ready for your use, Edmonds owns set of different shape drag models, each with identical frontal area to allow you to compare the different coefficients of drag for each shape. One of these shapes is dimpled like a golf ball. Do the dimples really make the ball go further?

Specifications: 50 mm frontal cross sectional area.

The airfoil has 20 static pressure tappings along its chord on the upper and lower surfaces. They each connect to tubes that pass through the airfoil and then out to clear, numbered, flexible tubes. Students can measure the pressure distribution around the airfoil, from which they can find the lift. (Note: Smoke visualization is not available for this airfoil - use the NACA 0012 airfoils WITHOUT tappings.

A set of two NACA airfoils are available for your use. One airfoil has a span that extends the full width of the working section of the wind tunnel. This model has the characteristics of a two-dimensional airfoil (edge effects are minimized). The other airfoil has a span that extends for half of the working section of the wind tunnel. This model has the characteristics of a three dimensional airfoil with edge effects included. Comparing the measured lift and drag of the two airfoils shows the differences between two-dimensional and three-dimensional airfoils.

Smoke visualization of the airflow is available with these models.

Using a Pitot tube, students can traverse the airfoil wake of the full-width airfoil. This gives them the downstream pressure distribution to find the drag on the airfoil. These measurements can be compared to the direct measurements obtained from the force balance.