1. Go to the left side of the screen and select "DRAG BALANCE." In the simulation, you are looking down on the apparatus.

2. Next, click "Step 1: Select Model." The models are wing sections. Some are flat and some are curved. For the first experiment, select a flat plate (Model 1).

3. Next, click "Step 3: Start Tunnel." The air will begin flowing around the plate.

4. If you observe the Drag Balance (a meter varying from -20 to +25 degrees) at the bottom center of the screen, you will see that the ratio of drag to lift is 0.00. There will be some small drag present. But since there is no lift, the Drag/Lift Ratio is not defined.

5. Now, click "Step 2: Set Angle of Attack." Move the cursor onto Wilbur's arm. Hold down the left mouse button and move the cursor up or down to adjust the angle of attach. For this experiment, adjust the angle of attack to 3 degrees.

6. Click again on "Step 3: Start Tunnel."

7. Observe the Drag Balance again. The Drag/Lift Ratio = 0.089 - 0.096, which means that the drag on the flat plate is now 8.9% - 9.6% of the lift.

8. Increase the Angle of Attack. What happens to the Drag/Lift Ratio?

9. Try other shapes. Follow the suggestions on the simulator page to experience how Wilbur and Orville systematically developed successful wing designs. (Try bi-wing and tri-wing designs!)